MadModder
Gallery, Projects and General => Project Logs => Topic started by: sbwhart on December 18, 2011, 05:13:24 AM
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I've not bin Idle these last couple of weeks I've bin doing a bit of research on an engine that caught my eye. Its a bit of a strange beast it has a rotary action that I can best describe as a captive eccentric. The original was first displayed at the great exhibition and was shown powering some textile machinery, as far as I can find out only two were made, though there is very little documentary evidence for the second.
I've got enough of the drawing done to show you an assembly, but I still need to do more detailing of the parts, but its enough to give you an idea of how it will look.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/Sht1-Model.jpg)
I'll slowly work on the drawing and start to get material together ready to make a start and cut metal in the new year.
Stew
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Hi Stew
Looks like this is going to be another interesting build :D design looks great :thumbup:
Rob
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Wow, where do you find those strange engine ? :smart:
I will be follow this with great interest. :mmr:
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Wonderful :) Please post plenty of pictures of the build.
This was one of the first engine I animated for Doug (http://www.douglas-self.com/MUSEUM/POWER/rotaryengines/rotaryeng3.htm).
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That is a strange engine got my curiosity up for sure. I'll be keeping my eye on this one.
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Design looks great Stew :thumbup: - I'm looking forward to your build :D :D
:beer:, Arnold
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That'll be a neat one, Stew. I have plans for one like that. Quite an oddball.
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Looking forward to seeing it go together!
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Hell's bell's Stew, how on earth do you do it ? :scratch: I am now totaly convinced that you NEVER sleep. :med:
Cheers Derek
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Thanks you all for your support and interest Guys
Bill:- bin looking at your animation for the Dake engine (I think it was yours) now if you guys think this ones a strange beast you should try doing a google for William Dake square piston engine thats a double :scratch: :scratch: :scratch: no treble.
Dek this is the one I'm going to Mr Hustons metal imporium for a scratch around for.
When I've got the drawing completed I'll put them up for offer if anyone wants a copy, just send me a PM but wait until I've got them finished.
Stew
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This looks like a cool engine. Can't to see the build.
Eric
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Bill:- bin looking at your animation for the Dake engine (I think it was yours)
these ones ?
http://wktodd.webspace.virginmedia.com/animations/
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Thats the one Bill :thumbup:
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Started to cut metal on this engine, first job cut the cylinder out of a chunk of brass and square it up
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1109.jpg)
Next using my new digital height gauge from Santa mark it out and light centre pop the lines.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1111.jpg)
Then in the mill with a wobbler find the edge of the lump and bring the mill onto its centre, and set the vice stop.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1117.jpg)
Then working to the marked lines chew out the edge to start forming what will be the port face flip it over and do the same on the other edge.
Turn it on its end a chew out the end edge, flip it over and do the other end
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1124.jpg)
Sit it level on parallels check that we are still on centre, and drill a couple of 13mm on holes on the what will be the centre for the cylinder.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1126.jpg)
I was getting a bit cold at this point so went in for a warm, I'll pick it up again tomorrow.
Any one who would like a copy of the drawing just send me a PM with your email adress on.
Stew
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Looking good Stew!
Raises hand! Would like a copy.
Eric
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Nice to see you're back into your shop again Stew! :clap:
I was beginning to feel mild withdrawal symptoms........ :D
David D
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Ok Guys big red face time I dropped a bollock with the drawing
:doh: :Doh::doh: :Doh: :doh: :Doh::doh: :Doh: :doh:
I've made the cylinder too long, it should be the 30 + 15 plus 1.5 = 46.5
I drew it as 30 + 30 it was only after I had drilled it that I started to think that looks too wide better check it out, :doh: :Doh:
Just measured things up and all is not lost I can still fit the correct width of cylinder in, but I need to chase the change through the drawings as it will impact on the con rods, cylinder covers and the valve chest.
So it's back to the drawing board.
You'r top of the list Eric for the amended drawings :thumbup:
Stew
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Nice Stew, this project would be very interesting to follow, and I will be watching you :lol: :lol:
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:Doh: That's bad news Stew. Still, all part of the fun of a from-scratch-design :D - I'm sure you'll have it sorted quickly!
:beer:, Arnold
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Happy New Year Stew, am quietly following. I've seen these engines which look very interesting ... always thought they were too complicated to find out how they work but now I'll get to see all the detail! Keep up the good work :bow: :thumbup:
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Cheers Guys
Things have bin a bit slow on this over the last week, what with having to redraw some of the parts, and other things getting in the way:- plus I went down with the dreaded puckes.
All fit now and bits redrawn.
First job was to put the bollock right.
So plugged the holes and respotted in the correct position.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1128.jpg)
In order to get things in the correct position I had to use a boring head, just opened the holes up just enough to give a good register for a mandrel.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1133.jpg)
Then turn a mandrell up a nice fit in the hole.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1135.jpg)
Then transfer chuck and mandrel over to the RT and bolt the cylinder to it.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1144.jpg)
Then machine the rads around the rim
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1137.jpg)
Turn the RT onto the horizontal and machine the pocket around the top.
First with a radius cutter
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1146.jpg)
Then take the meat away
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1150.jpg)
Then do the same with the base but leaving a flat for the foot to solder too.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1152.jpg)
Your probably a bit baffled as to where I'm going with this, well I'm baffled as well :lol:
Stew
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Looking good Stew :thumbup: :thumbup:
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Baffled? ......... Baffled! ........ Yes! :scratch:
But, don't concern yerself Stew. I have faith......... I know it'll all come right, eventually. :D
I look forward to the usual happy ending......... :thumbup:
David D
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Got a little done today: made the cylinder base this will be silver soldered to the cylinder.
Started life as a bit of 12mm thick brass sqaured up and milled to size.
Then first with a end mill and finishing off with a 10mm bull nosed cutter machined out a plinth in its middle.
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1154.jpg)
It fits on the flat like this
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1157.jpg)
I'm not going to solder it just yet the cylinder covers will need soldering as well so I'll do them together.
Stew
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I ,,, but Stew ,,,,,,,will it be ready for Harrogate :poke: :)
Rob
PS ,,,,, cracking job by the way :clap: :clap: :clap:
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I ,,, but Stew ,,,,,,,will it be ready for Harrogate :poke: :)
Rob
PS ,,,,, cracking job by the way :clap: :clap: :clap:
It will be darn close ready for Harrogate, it may be a bit rough but it will be close.
Any way got the base soldered to the cylinder, it took two goe's my first atempt the nozzle was a bit small and I wasn't getting enough heat into it, swapped to a bigger nozzle and it went like a dream, at the first attemp I tought should I swap to a bigger nozzle, but I was to lazey and went with what was fitted, came out ok in the end its slightly skiwiff, but a light skim of the base should sort that.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1175.jpg)
Next up the covers, I'm making these out of 1/8" thick brass, first job cut then off the bar and square the ends, then carfuly drill the centre holes 3mm to take dowels and a couple of 1/16 for brass pegs to locate a thickening peice.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1167.jpg)
Then cut out the thickening peice square them up and drill them for the 1/16 pegs
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1162.jpg)
File a rad on each end
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1165.jpg)
And this is how they fit on the cover for silver soldering
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1168.jpg)
Job done:- the pic doesn't do it justice its a very neat joint.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1172.jpg)
The covers have a curved slot that the piston rod runs in this has to be on a 75mm rad, and the covers have to fix centraly on the cylinder bore. so I made a fixture to hold the covers on.
A 10mm hole was drilled and reamed in the jig 75mm from this two 3mm holes were drilled to take 3mm dowel pins, and a hole drilled and tapped to take a clamp. I also made a 10mm clamp bolt with a 10mm register dia a neat fit in the 10mm hole in the fixture, this bolt screwed into the surface plate that I made some time ago to increase the capacity of my RT.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1160.jpg)
and how it all fixes together.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1173.jpg)
Stew
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Stew
You are making it look easy again :bugeye: :bugeye:
John
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Stew
You are making it look easy again :bugeye: :bugeye:
John
He does that, doesn't he, John! :scratch:
I like your "surface plate" extension Stew. I use the lathe's faceplate.
Keep on, keeping on....... :thumbup:
David D
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Cheers John/David
I can now start treating the cylinder like a casting, the trouble with this design of engine is that its so weird, its difficult getting your head round feature that are important.
I figured that it will be important getting the slot that the piston rod moves in central with the cylinder hence the fixture I've made.
So to mill the slot first centre the RT on the mill spindle zero things up then, using the bolt secure the fixture to the table, but first clock it up level with the Rt set on zero deg.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1186.jpg)
Then index 75mm bolt the cover to the fixture and with a 8mm slot drill mill the slot.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1190.jpg)
Next drill the 2mm holes on the PCD, both ends
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1195.jpg)
Onto the cylinder centre it up on the mill zero the dials. and using a boring head bore out the cylinder vertically down, advancing 1mm vertical down again advance 1mm etc etc until its long enough.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1198.jpg)
Did this for a couple of rouging cuts, then to finish advanced it 0.5mm/cut , this left a slight ripel in the bore but that will soon clean out with a bit of fine emery cloth wrapped around something flat.
Then on the centre line drill a couple of holes each side to take 3mm dowels.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1201.jpg)
Locate the covers on the dowels and spot through 2mm followed through with M2 tapping drill.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1204.jpg)
Centre the jig back up on the RT and radius the end of the covers.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1213.jpg)
And this is what the covers look like on the cylinder, only got one finished before domestic duties called, I'll finish the other off tomorrow.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1221.jpg)
Hope things are starting to look a bit clearer.
Stew
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Hope things are starting to look a bit clearer.
Stew
Now, it reminds me of a cross between a mantel clock, and a diver's helmet......... :lol:
Thinking I might be getting some idea....... Is the cover on upside down, in your last pic, Stew? :scratch:
Or, is it a test to see who's paying attention? :poke:
Or, is it just an optical illusion? :thumbup:
Or, should I just sit here, quietly? (http://serve.mysmiley.net/rolleye/rolleye0011.gif) (http://www.mysmiley.net)
David D
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You win the coconut for observation Dave, yes the cover is on upside down
:lol: :lol: :lol:
Stew
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You win the coconut for observation Dave, yes the cover is on upside down
:lol: :lol: :lol:
Stew
:ddb: :ddb: :ddb:YAY!! :ddb: :ddb: :ddb:
I might be getting the hang of it....... :D
David D
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The building is coming along very nicely :clap: :clap: :clap: ,
still I have hard to understand how it works despite that I was looking at the drawing and the animate picture. :zap:
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Thanks Dave/Bennie
Her's a pic of the covers the right way round, I think it looks happier the other way :D
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1223.jpg)
With both covers fitted i put a length of 8mm silver steel through the slot and measured the height side to side and front to back, and it was within 0.06mm:- not alf chuffed with that :D :D :D :D :D :ddb: :ddb: :ddb: :ddb: :ddb:
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1222.jpg)
Back on the mill and drilled and milled the air ways, and drilled m2 tapping for the valve chest.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1226.jpg)
Then tapped the holes M2 using the tapping stand to get them square, these holes are on both side of the cylinder, on the model they don't do anything, but on the origonal the cylinder sides were spring loaded to take up wear hance covers both side.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1230.jpg)
On with the valve chest now, first square it up to size, then centre spot where the bore is to go for the spool valve.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1233.jpg)
Then in the four jaw chuck clock up a wobble bar centred on the spot centre.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1234.jpg)
Centre drill then drill and ream 8mm.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1236.jpg)
Swap it round clock the centre spot up on the face.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1238.jpg)
Drill through into the 8mm bore and face the boss for the air coupling.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1242.jpg)
Over onto the mill using centre the work and with the DRO drill the holes on the PCD for the coupling.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1246.jpg)
Flip it on the back find the centre and drill the feed ports and 2mm for the studds
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1248.jpg)
That was a good morning work :D :D :D :D
Any one know where I can buy some M2 studding in the UK.
Stew
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Thanks Dave/Bennie
Her's a pic of the covers the right way round, I think it looks happier the other way :D
Any one know where I can buy some M2 studding in the UK.
Stew
Yer right Stew! It does look a little sad, now...... :(
Studding? Try here....... http://www.modelfixings.co.uk/metric_studding.htm
David D
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Thanks Dave
Got some ordered :thumbup:
Stew
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Hi Stew ,,,, :bow: :bow: :bow: the cylinder looks GREAT ,, cracking bit of machining :clap: :clap:
Rob
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Thanks Rob
Got the stream chest finished off, today.
Drilling the holes for the sealing gland.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1250.jpg)
Next up the little top hat to take the graphite cord.
Turned the OD and reamed through 3mm parted off flipped it round then used a slot drill to cut the flat bottom hole.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1252.jpg)
Then turned up the spool valve from some silver steel bar,
Drill and tap and acuratly turn the gap and over all length as these are important to the valve timing.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1255.jpg)
Camera went flat at this stage, and couldn't be arsed to get the spare out of the house.
Finished of the rest of the bits for the gland, this is how they all fit togethere
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_3576.jpg)
Then onto the valve cross head bar, made this from a bit of 1/4 square bar, so in the four jaw self centring chuck, rough out the steps.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_3581.jpg)
Then with a thin tool and with the compound slewed over 5 deg turn the taper bits.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_3584.jpg)
Over onto the mill and find the midle of the bar and drill though 3mm index to the outside bits and drill these through 3mm as well.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_3588.jpg)
Then with an end mill thin the end bits out.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_3591.jpg)
Time for an hows it looking.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_3592.jpg)
Stew
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Time for an hows it looking.
:thumbup: :thumbup: :thumbup: It looks GREAT Stew; you've certainly upped the pace now :bugeye:
:beer:, Arnold
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Thanks Arnold :wave:
Things will slow down over the next week as I'm on domestic duties :(
Decided the cross head would look better with the end bits rounded off so made a filing button and nibbled away with files, I think that looks better:-- less clumsy.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1259-1.jpg)
Used the rest of the morning making the link bars.
First cut off a length of bar enough to make all three links, then drilled some pairs of 3mm holes 12.5mm apart, the DRO on the mill gets the pitch for each one very accurate.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1276.jpg)
Cut each link from, then turn a 3mm mandrell on the lathe, bolted each link to it and faced it off to form the arm.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1277.jpg)
With the same filing button finished the ends off, then drilled and tapped M2.5 for a grub screw.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1281.jpg)
Job done
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1282.jpg)
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1288.jpg)
Stew
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Looking good Stew, it's so very nice to see how you easy do your work :clap: :clap: :clap:
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I love the way you deal with the fiddly bits Stew! :clap: :clap:
David D
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Thanks Guys
Started back on the engine for a little while at least.
Finished off the rest of the linkage
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1383.jpg)
Stew
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:bugeye: your the man Stew :clap: :clap: :clap:
Rob
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That's a great looking assembly Stew! :clap: :clap:
Purposeful...... :thumbup:
David D
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Words fail me :bow: :bow: :bow: :clap: :clap: :clap:
I like the way you can make tiny bits look big :clap: :clap: :clap:
John
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I recently got to hold the drain taps that Stew had made , now I thought they where quite big for something like a 3" tractionnengine until he handed me one it was TINNEY I was very very impressed with them, :drool: :drool: even my wife who normally just says yea lump of metal had to have a look and was impressed (I think a first for heir) :bang: also this engine is one Heavy piece of nicely machined brass, I think l I know how it works now !
Peter
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Thanks Chaps
Peter it was nice meeting up with you and you'rs, its a shame it was in such sad circumstances
Well made the piston today its a job I've been putting off don't know whyi I guess I just had a funny for doing it.
I liked the idea of making the piston out of PTFE, the main reason is its slippy plastic and quite soft, and I figgured that if I made it just a coulple of though longer that the cylinder it would act as a good air seal against the covers :scratch: we'll just have to see how it works out the bottom line is to change it for steel if it don't work out.
I used very sharply honed tools it cut like butter with a great finish.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1386.jpg)
Set it up in the mill and drilled the off set holes.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1388.jpg)
Back on the lathe and resessed the faces.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1395.jpg)
Then parted off a length of 8mm silver steel (drill rod) and put a rough straight knurl into the middle.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1401.jpg)
Sorry its such a crap pic
Then gently tapped the rod into the cylinder the straight knurl acting as splines to give it grip.
Mounted it back in the lathe a carfully skimmed the cylinder to width
The cylinder covers wern't sitting flat so gave them a bash wif me ammer, and a rub on emery cloth on a flat surface.
This is how it looks in the bore
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1402.jpg)
Stew
-
You are doing a fantastic jobb, nice to see that you are coming along very fine. :bow: :bow: :bow:
-
Cheers Benni
Had a couple of sucessful days in the shop.
Made the crank webs, they are of the pinch clamp type so you can get them on and off due to the design of the engine.
First drill the holes 2 with 8mm crank pins 2 with 6 mm crank pins
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1403-1.jpg)
Cut off with slitting saw
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1407.jpg)
With two drill through the holes across top of vice, mill off so they are central, for the two cranks with the 6mm crank pin holes had to use a drill imm smaller
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1408.jpg)
Drill and tap and open up half with a clearance drill
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1411.jpg)
Cut the split.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1414.jpg)
Then with filing buttons file to shape, they still need a bit of tidying up and a rub with emery, but her they are with the buttons
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1415.jpg)
Think they look a bit on the heavy side may thin them out a bit.
Next up the con rods the engine has four using 9/16 free cutting mild steel first cut off to length face them up so they are all the same and centre drill and turn up a lost centre.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1419.jpg)
With a part off blade put a couple of grooves into them to show where to stop and to give some clearance to the turning tool.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1420.jpg)
The with a running centre chew the meat out of the middle.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1421.jpg)
Slew the compound over a couple of deg and with a radius tool form taper toward the chuck, swap it round and tune the other end to form the barrel.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1424.jpg)
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1425.jpg)
Cut the centre pips off then over on the mill cut the flats.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1426.jpg)
Called it a day at that and went for a brew and a snooze.
Stew
-
Hi
Stew
Coming on leaps and bounds :bow: :bow: :bow:
Did you get some 2mm studding
I could always screw cut you a length :lol: :lol: :lol: :lol: :lol:
John
-
Hi
Stew
Coming on leaps and bounds :bow: :bow: :bow:
Did you get some 2mm studding
I could always screw cut you a length :lol: :lol: :lol: :lol: :lol:
John
Yes I did John a 1M length from flea bay £8 including postage
No idea how they managed to screw cut that length :scratch:
:lol: :lol: :lol:
Stew
-
Good going Stew :clap: :clap: :clap:
:beer:, Arnold
-
:beer: Arnold
Finished off the con rods
Drilled and reamed
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1427.jpg)
Then turned up the bearings I needed eight of them I didn't want to P*** about to much, so turned a length of bar for a good fit in the con rod ends and parted off.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1428.jpg)
I'm using my independat four jaw that chucks up very true, this allowed me to drill and ream right through the bar.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1429.jpg)
Then it was just a matter of parting the bearings off to length, fitted into the con rod with a spot of bearing retainer.
A bit of work with filing buttons to shape the ends and this is they fit to the cylinder
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1441.jpg)
Thing comming together well
Stew
-
As usual very nice build Stew :bow: :bow:
-
Thanks Benni you'll like this next bit :------------ I did :D
Eccentric strap:- I've had it in mind to make the strap silimar to an eccentric on an 1850 ish beam engine I saw in a museum, it was a lovely cast iron job with a delicate latice work of circles, this will be too small to do the cirlces but I fancied doing something in that flavaour.
First part the strap end, cut off a sliver of brass 5mm wide drilled an hole up the middle and mounted it on a mandrel in the rotary tabel, and generate the strap end out.
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1444.jpg)
Then drill and tap M2.5
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1450.jpg)
Split it in half bolt it back together and grip it in the self centering four jaw and bore it out.
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1458.jpg)
I've spent ages thinking how to do the next part, I've had all sorts of complicated plans, in the end i decided to go the simplest way as i'm a bit of a simple bugger at heart.
So milled out a couple of 3*5mm wide strips of brass and with a big chunk for the other end to give me plant to machine to get it squared up after soldering.
Filed an angle on the end of the strips and butted them up against with a bit of flux and a few nuggets of silver solder, and a few weights to stop it moving:- and solder it together.
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1461.jpg)
Onto the mill and sit the strips on a thin bit of strip and gripping the chunk mill the chunk up square to the strips.
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1463.jpg)
Cut the strips up to length, and file a chamfer to but up against the strap end.
Then back on to the soldering hearth and solder
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1465.jpg)
A couple of hours in the pickle, drill the cross hole and cut the slot
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1470.jpg)
A bit of attension with files and it's not looking too bad.
(http://i431.photobucket.com/albums/qq32/sbwhart/131_1477.jpg)
:ddb: :ddb: :ddb: :ddb: :ddb:
Stew
-
By ek! That's a bit clever Stew! :clap: :clap:
Well thought through, and carried out....... Looks great too. :thumbup:
David D
-
Hi
Stew
That is a astounding bit of fabrication soldering & machining :bow: :bow: :bow:
You have the proportions spot on :thumbup: :thumbup: :thumbup:
2.5 mill threads :lol: :lol: :lol: :lol:
John
-
Extremely nice work, you're the man :clap: :clap: :clap:
-
Thanks Dave/John and Benni
Got the eccentric finished off today
With a bit of bar in the lathe face and turn OD, then with a parting blade turn the 20mm dia * 5mm groove for the strap.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1478.jpg)
Tranfer the chuck over onto the mill centre it under the spindle and off set 3.2 and centre drill.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1480.jpg)
Back onto the lathe this time with a independant four jaw chuck and with a wobble bar clock the centre true
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1482.jpg)
Then drill and ream 8mm and turn the boss down.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1484.jpg)
In the three jaw chuck and part off.
Drill and tap M3 for a retaining grub screw
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1485.jpg)
Job done
Time for a lose assembly of the parts made so far.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1486.jpg)
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1489.jpg)
It looks more like a knitting machine than an engine, i wouldn't be suprized if it knitted me a pair of socks when it starts up, would any one like to place an order for a pair
:D :D :D :D :D :D :D
Stew
-
:drool: :drool: :drool: :drool: :drool:
Very nice :thumbup: :thumbup: :thumbup:
John
-
Lovely work Stew :) :thumbup:
I notice the piston rotating cranks are both set at the same angle, shouldn't they be at 90° to each other ?
Bill
-
Lovely work Stew :) :thumbup:
I notice the piston rotating cranks are both set at the same angle, shouldn't they be at 90° to each other ?
Bill
Yes you're right Bill it was just a lose assembly to get an idea of how it fits together, I need to make base before I get om and make the bearing and fly wheel, don't think there is much more to do then.
Stew
-
Wow Stew. That build is coming along quite nicely.
:nrocks: :nrocks:
Eric
-
Thanks Eric
Things slowed down durring the past week while a did a little commission work :D.
Started on the base, first I squared it up to size, then drilled and tapped the cylinder fixing holes for M3 studs.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1503.jpg)
This was so I could set the cylinder down and get some idea of whare the cut outs were to go and how much to cut out.
Then marked them out with the height gauge centred popped the lines and hatched them out some, so I didn't get mixed up.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1512.jpg)
Then drilled the coners of the cut out first.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1513.jpg)
Then chewed them out with a slot drill.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1515.jpg)
Quick look see
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1517.jpg)
Now on with the columns, I'm fabricating these out of ally bar, for the fluted column I'm using 9/16" bar, first cut the bar down into handy lengths than face and centre drill one end. In the spin indexer with a 1/4" ball nosed cutter mill the 12 flutes.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1525.jpg)
This is whare the power feed on the mill pays for its self, whist it was doing its thing, I fired up the lathe, and parted off the bases from some 20mm square ally bar.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1519.jpg)
I'd have got these roosters finished today but my boss dragged me out of the shop to go the Docs for some injections for our visit to Africa. :- Now got a sore arm :(
Stew
-
Stew,
My word it does look good, :bow: :thumbup: :clap:
So where in Africa are you going?
:beer:
DaveH
-
Thanks Dave
Were going to Tanzanei just a 10 day visit but were packing a lot in:- Serangete, Orongoa Crater, the low bit of Kiliemanjaro, looking forward to it.
-
As these parts will have a delicate edge that will be easily damaged by the chuck jaws I made a split collet, to hold them.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1535.jpg)
Using the split collet part the flutted collumns off to length.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1533.jpg)
Then as its important that the collumns are all the same length I fitted my back stop into the spindle nose, this is it with a few of the interchangable ends i've made for it.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1536.jpg)
Then using the back stop face, drill and tap M3, I though I had a picture of this but no.
Here they are done they are all within 0.05mm
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1539.jpg)
Again using the back stop face off the square bit so they are all the same thickness
Got a pic of this :D
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1547.jpg)
Her they are with the columns
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1549.jpg)
Stew
-
Looking good Stew :thumbup:
Like the flutey bits ... might have a go at that myself, now I've replaced the stripped gears on the mill ... :bang:
Don't ask ... :Doh:
Have fun in Tanzania. Been to Serengeti & Kilimanjaro ... it's BIG ... 'kin huge ...
Is Olduvai Gorge on the list? Interesting place where Dr Leakey dug up the Lucy fossils..
EDIT No. it wasn't Lucy, but there were some early hominid fossils there IIRC.
Don't forget my stick of rock will you ??
BC
-
Looking good Stew :thumbup:
Is Olduvai Gorge on the list? Interesting place where Dr Leakey dug up the Lucy fossils..
EDIT No. it wasn't Lucy, but there were some early hominid fossils there IIRC.
Don't forget my stick of rock will you ??
BC
No unfortunatly not, some sort of dispute going on over the charging to get in :scratch:
Your stick of rock is on order. :D
Stew
-
That's a shame .. I found it very interesting. To see a 'floor' where early humans had been 500,000+(?) years ago.
It was Dr. Mary Leakey there at the time. We had a personal tour with an African Paleontologist for a couple of hours.
I found it fascinating, but then I've always been a bit 'fossiley'.
Not a lot to do with your engine though. :offtopic:
BC
EDIT
Flamin' 'ell .....Dr. Leakey was there when we went. Not 500,000 years ago .. :doh:
-
That's a shame .. I found it very interesting. To see a 'floor' where early humans had been 500,000+(?) years ago.
It was Dr. Mary Leakey there at the time. We had a personal tour with an African Paleontologist for a couple of hours.
I found it fascinating, but then I've always been a bit 'fossiley'.
Not a lot to do with your engine though. :offtopic:
BC
EDIT
Flamin' 'ell .....Dr. Leakey was there when we went. Not 500,000 years ago .. :doh:
Yes it is a shame it was in the origonal itinery but has since bin taken out.
Bit more done on the engine the pillar parts was more about mass production than anything, made the roundels from 20mm brass bar, i'm going to paint the columns mat black and leave the roundels shiny brass :D
Used a form tool to form the rads drill and parted off
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1554.jpg)
Sorry about the crap pic.
Then with the back stop faced them all off the same.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1555.jpg)
Then turned up a mandrell a blended things in and gave them a polish.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1558.jpg)
This is how one looks like.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1561.jpg)
And time for an interest boosting assembly.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1564.jpg)
Not looking too bad.
Stew
-
Wow Stev this is rely something another masterpiece here on MadModder :clap: :clap: :clap:
-
Not looking too bad.
Now THAT is an understatement Stew !
It's looking fabulous :bow: :thumbup: :thumbup: :thumbup:
:beer:, Arnold
-
Thanks Bennie and Arnold
Its bin a good day in the shop finished off the fly wheel.
In the independat four jaw true it up so the inside of the rim is running true, then clean up the hub and the inside of the rim, face and turn a register on the OD.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1565.jpg)
Turn it round clock up the register true, and clean up as for the first side.
Then griping on the inside of the wheel clock the register true and clean up the OD, and drill and ream 8mm
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1566.jpg)
Job Done
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1569.jpg)
Stew
-
"Job Done".
The whole job done blummin well, Stew! :clap: :clap:
I've been trying to educate my pal in Scotland...... How to deal with flywheel castings which are larger than the chuck. By gripping on the rim recess.
He needs to see this. Thanks for showing! :thumbup:
David D
-
:clap: :clap: :clap: :clap: :clap: :clap: how nice is that there engine looking :drool: Stew :bow: :bow: :bow: :bow:
Cracking job :thumbup:
Rob
-
Thanks for your comments Guys
I'ts amazing how you get an image in your mind of how you want an engine to look, and the boost you get when that image starts to become reality.
I was planning of having three columns on each side but decided that the short side only needed two,
I also ran out of square bar :lol: :lol: :lol:
Some nice brass acorn nuts holding the columns in place will help set it all off. :drool: :drool: :drool:
Stew
-
Work of art Stew :bow: :bow: :bow:
It really looks the dogs nutts :clap: :clap: :clap: :clap:
I cant wait to see it running
John
-
Just brilliant, and so informative, thank you. :bow:
John
-
Thanks John and John
Things have been real slow on this build over the last week due to domestic duties.
One of those duties was solving the aviane housing problem in Glasgow where our son is moving into a new/old house, with a big garden, he asked if i could make him some bird nest boxes, yes I said, he proptly ran through a list of boxes with diferent hole sizes, and shapes, plus a box for Bats and a block of flats for sparrows.
This is the score minus the sparrow tower I ran out of wood for that, which I will buy at B and Q on their old git discount day.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1570.jpg)
Made some acorn nuts for the engine, ground a form tool up to form the dome.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1573.jpg)
This how they look on the engine.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1576.jpg)
Then made a start on the bearing housing, I'm going to try and emulate Jason, and Ramon's method using JB weld. First square up to size a chunk of ally, then run a 3mm rad down each edge.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1579.jpg)
Cut off and skim them off to all the same length, then rough drill the hole for the bearing.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1581.jpg)
Drill through M2.5 tapping.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1582.jpg)
Her desaster struck :doh: I broke the drill and failed to get it out, tried nocking it out from the other side it moved a bit then i got the punch stuck, so gave it up as a bad job I'll just have to make another, in fact this may not be a bad thing as the flywheel bearing could do with being a bit wider.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1584.jpg)
Cut the caps off with a slitting saw.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1585.jpg)
Tap M2.5 and bolt them together, and then giving the scrws a bit of support pass a 11mm end mill vertically down through to form the bearing bed.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1588.jpg)
Now for the bases as before clean up and square the ally to size, cut them off and mill to the same length.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1589.jpg)
Then using the sine bar angle the edge of the base.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1590.jpg)
This is what they look like so far, the main bits needs sortening to get the centre height so they will look more in proportion.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1594.jpg)
The next couple of weeks will be slow weeks as well which is a bit frustrating as there isn't that much to do to the engine.
Stew
-
Oh Stew you could have done better than those elongated dome nuts, surely some nice pineapple nuts would have been more appropriate :)
Bearing Blocks look good.
J
-
Hi
Stew
That bird box 3 from the left one of the nails looks to be about .001 out of line :lol: :lol: :lol:
The bearing blocke are up to your usuall standard :clap: :clap: :clap:
John
-
It ALL looks good to me....... :thumbup:
David D
-
Nice :bow: :bow: :bow:
-
Great going Stew :thumbup: - I like the finishing touches you're adding.
:beer:, Arnold
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Thanks for your interest chaps :wave:
Oh Stew you could have done better than those elongated dome nuts, surely some nice pineapple nuts would have been more appropriate
I've no idea what pineapple nuts look like:- did a little research, are they like an upside down acron nut with a flared top :scratch:
For those of you who don't know what a sine bar look like hers mine:
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1601.jpg)
The bar is made to a very accurate length between the rollers and you just pack one end up to give the desired angle, that you calculate using the sine function.
Finished off the base by drilling the holes, the outer holes were countersunk flat bottom to take the bolting pads and the centre hole for countersunk for the cap screws.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_0666.jpg)
Then turned up the pads.
And the bearings.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1602.jpg)
I like to push the reamer through with a centre with a drive carrier, that way it floats and you cut a true size.
This is how it all assembles together.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1605.jpg)
Then stuck the lot together with JB weld gave it 24 hrs to cure then cleaned them up.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1612.jpg)
Now they look good:- a big thanks to Jason and Ramon for sharing the method its one I will use again in future.
One more bit made the drive half shaft. I was going to make it from 12mm bar, but didn't have any so used 15mm and turned it down to 12mm with an 8mm step for the fly wheel threaded M8
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1606.jpg)
Stew
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Managed to sneak a couple of hours in the shop this morning thanks to my grandson, the little darling had been playing with my bed side clock and put it forward 1 1/2 Hrs so bright and early I was up at my usual time, it was only when I looked at my shop clock that I noticed how early it was
:lol: :lol: :lol: :lol: :lol:
Made the fly wheel drive for this I needed at 36mm dia * 10mm slice of mild steel I hadn't got any bar but I did have some 1/2" thick *
1 1/2" steel bar, so I cut of a 1 1/2" length put a centre drilled the middle and then used a friction drive to turn it into a disc.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1626.jpg)
Then skimed the faces up.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1628.jpg)
Set it up central on the mill and put a 12mm off set and drilled 9mm
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1632.jpg)
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1631.jpg)
Then drilled and reamed 12mm through the middle
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1634.jpg)
Drilled and tapped M3 for a fixing grub screw.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1635.jpg)
Then made a 6mm bush for the crank drive and pressed and pressed it into the disc.
Time for a few hows it looking shots.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1638.jpg)
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1637.jpg)
Stew
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How's it looking, Stew?
It's looking as though it's shaping up very well. As usual! :thumbup:
Grandkids.... Love em! Despite the chaos, mess, and fingerprints. :palm:
Your Dixon type toolpost, in the reaming pic, Stew. What's the 1/4" empty hole for? :scratch:
(I'm just fitting one to my lathe)........
David D
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Your Dixon type toolpost, in the reaming pic, Stew. What's the 1/4" empty hole for?
(I'm just fitting one to my lathe)........
Don't know :scratch:
Its never got in the way of anything:- I supose every hole has to be some ware :lol:
Stew
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David, I got one of those holes in my toolpost as well, :scratch: came free with the toolpost,but never used it, and would sell it if i could get it out. :loco:
Cheers Dek
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Stew, Dek.
Don't like to see holes, even free ones, with no obvious purpose. :scratch:
So, I made an anti rotation/ location, screw in widget, for mine......... :thumbup:
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020154.jpg)
David D
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david
they were in the dikson ones and I believe they were for a indexing arrangement but as with all things when the are reproduced they just do it with no thought ,
Stuart
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Holy smokes, Stew, that's just amazing. Resembles a wedding-cake, perhaps you could sneak it past the better half as such?
Also, a HUGE thank you for showing all the build steps, I learn so much from your posts. One Q about the filing buttons; do you harden them? Or do you just rely on stopping when you start scratching them? And can you give me an idea of how long it took, roughly, to file down the ends of the crosshead bar? I tend to get bored with filing after about 3 minutes, so if it's a 4 hour job, for example, I'd be looking to do it on the rotary table...
Meanwhile, have one of these: :nrocks:
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Ade
I tend to keep the buttons soft, and use them as a one off, some people do harden them, then the file skids over them, I prefer just to scratch the surface of the soft ones if you have more than one rad to do you can usualy give them a part turn so that you've got a clean untouched bit of button to use, to do the cross head i would say 10 min max.
Hope this helps
Stew
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Stew, Dek.
Don't like to see holes, even free ones, with no obvious purpose. :scratch:
So, I made an anti rotation/ location, screw in widget, for mine......... :thumbup:
(http://i110.photobucket.com/albums/n95/Dayjo/After%202012/P1020154.jpg)
David D
On the whole I thinks thats a good use of that hole Dave :thumbup: :thumbup:
:D :)
Stew
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Thanks Stew! :thumbup:
I don't like to see holes, just standing around, idle. Gotta find 'em something to do....... :smart:
With two precise location points, I can't see the massive torque of my mini lathe disturbing this toolpost's setting! :D
David D
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:update: :update: :update: :update:
Things have been real slow on this engine due to family commitments but have managed to steal an hour or two her and their.
I had to do a major sculpturing job on the base, it was my own fault instead of following the drawing I changes the hole centres for the pedestal as i thought they would make thing look more symmetrical, but I forgot about the impact on the length of the crank.
Any way with that sorted I've I spent some time getting my head around setting the timing:- not easy as you can't get at anything.
But I have had it running for short time, but it will only run with lots of oil in the cylinder, I think I have to reduce the clearance of the piston, which will be a major strip down, but the positive thing is that It will run, as soon as I get a longer run out of it I'll post a video.
Stew
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:D :D Have a coconut Stew :ddb:
Looking forward to some photos and a video :thumbup:
:beer:, Arnold
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Running! Did you say RUNNING? :bugeye:
Short time/ lots of oil. Who cares! It's still a runner! That's great news! :D :D
Blummin, well done Stew! :clap: :clap:
Looking forward to the endurance run video...... :thumbup:
David D
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Well got it running without having to fill it up with oil but its very gready for air my little compressor can only keeping going for about 10 seconds, I guess I may have run into the limitations of the design, they only made two of them so this speak for it self.
Stew
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:clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap: :clap:
That's lovely to see Stew! Lots of parts moving around..... :)
"We gotta get a bigger 'presser"......... :thumbup:
David D
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:bugeye: :bow: :bow: :bow: :bow: :bow: :bow: :bow: Nice one Stew :clap: :clap: :clap: :clap: :clap:
As ever,an excellent engine build ,,,,,,,,,, from drawings to running engine ,, first class :thumbup:
Rob
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Another Fab engine Stew and an interesting motion to watch, you are on teh home stretch now with just the finishing touches to go.
J
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Look grear Stew :) :bow: :clap: :thumbup:
Sounds like it's tight in one spot (BDC?) - it should have enough witness marks on the inside to workout where.
From my (little) understanding of the motion of these things, the piston is designed to roll around inside the 'cylinder' with ( guess) a thin film of condensate or oil 'sealing' the other side, so will always need a bit of 'clearance' . I'm also guessing it was suppose to have a sprung piston-ring type seal at either side .
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Thanks for you're comments Guys
Bill:- yes one or two tight spots the bearing centres are not quite correct had to slacken thing off to stop things tightening up needs a little shimming
Your correct about the action, the origonal had spring loaded sides, it a succesfull design only two made, only one of these ran. To start with I had 0.25mm end float from the piston this was far too much lapped the cylinder width down to reduce this to 0.05mm. It is getting better the more i run it, I've also spotted areas for improvement, but happy with it, I leave it aloan for a bit and keep running it I want to make a ball valve for it and a base so i'll get on with that in the mean time.
Stew
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Very nice again Stew, well done :beer:
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Cheers Nick :beer:
Still a bit along the learning curve to go with this engine.
To days lesson:- I made the piston from PTFE it seemed a good idea at the time, I know PTFE has some strange properties and that it has a high figure of coefficient of linear expansion, but I though that shouldn't pose any problem, I measures the width of the piston and the cylinder up and made them so that I had about 0.2mm clearance fit, I reduced this down to 0.05 to try and get a better run, but as I was doing this I was having problems getting a repeat size for the piston, this morning I stripped the engine down and measured things up the clearance was size for size, great i thought, tried it for fit and it all rolled over smoothly I fiddled about a bit, tried it for fit and things had tightend up, measured up again and I had an interferance fit :scratch:
Time for my morning coffee :coffee: so stuck the piston in the fridge for 1/2 hr measured up again and it had shrunk by 0.15mm.
Just done a google search on the properties of PTFE and as far as I can tell it has coefficient some 5 times greater than brass.
Time for a change of material i have some nice shash weight cast iron that John gave me I'll give that a try.
Stew
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Stew
Try some PEEK that what I use on piston valves , just polo mint looking bits with a stainless bobbin
but the big but and its a big un the price it OTT, or try Polly Models they do have some PPS Polyphenylene Sulphide again sit down when asking the price
Stuart
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Stew,
If the engine isn't going to be run on steam have you considered graphite for the piston? It worked perfectly in the two flame gulpers I made which require a very close fit and low friction. The way the graphite machines and its self lubricating properties make it an excellent choice for this. I don't know what it's coefficient of expansion is, but it must be very close to cast iron as those engines get very hot when they're running. If there was much difference it would either stop running or bind up ... it did with an aluminium piston.
Just a thought.
Cheers,
Nick
:offtopic:ps. are you going to Harrogate this year? Can't remember what day I said I'd go, will have to check the roster as will be helping on the club stand at some point!
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Hi Nick
Graphite sounds a good idea, I've made a cast iron piston and tried it for fit excetra and its seem a lot better than the PTFE, I've also resculptured the bases, and I'm in the process of putting it all together, but I've got a few domestic Job to do:- muck out and change the straw in the house etc.
I don't think I will be going to Harogate this year we've had so much on over the last month that things have been building up also Daughter is due to give birth to second grand child about then and we're on standby to look after grandson.
Cheers
Stew
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Stew,
Cast iron is probably the next best thing, that's what I used for my first flame gulper but now I want to do a graphite piston and valve for that as the next two engines ran so well with it. If you do try the graphite you'll find it very easy to get a good fit & finish, I just left mine in it's turned form to keep it nice and square and it quickly beds in to exact size. It's a bit mucky to machine but is a good lubricant anyway.
Ah that's a shame, congratulations, sounds like you'll be even busier soon then!!
Nick
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Thought I'd better update the build log
1st making the cast iron cylinder.
Turning to size after drilling off set hole
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1658.jpg)
The trepanning a groove for some packing,
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1663.jpg)
seems to work ok without packing tough, still nice to have the option.
Shaft assembly using same method as for the PTFE
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1675.jpg)
Also pinned the crank journal using soft nails.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1648.jpg)
Then whilst waiting for deliver of new 7" fly wheel made the stop valve, body fabricated in two parts silver soldered together.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1679.jpg)
Get to use the new ER32 indexing blocks to cut an hex for the valve pillars.
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1681.jpg)
Worked a treat :thumbup:
Completed valve
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1686.jpg)
And on the engine
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/131_1689.jpg)
Stew
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That engine and valve, look as though they were made for each other, Stew! :D
Well done...... :clap: :clap: :thumbup:
David D
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Nice job Stewart , there old panel pins, by the way where did you get the aluminum plate from for the layers of the cake ? :headbang:
:ddb: :nrocks: :ddb: Peter :ddb: :nrocks: :ddb:
:mmr:
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Cheers Guys
Pete:- I get the plate from ebay it's a bit pricey but it's the only place I've bin able to drop on the stuff.
I've got a bit more comming for another base so that I can support the fly wheel from both side.
Stew
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have you got a link at all, are you putting another layer on the cake ? :D :lol: :lol: :lol:
:ddb: :nrocks: :ddb: Peter :ddb: :nrocks: :ddb:
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HS93
these do ali up to 6 inches wide 1/2 thick and no VAT
Dont know where on the big ball you are
http://www.plhillsales.com/index.asp
no connection with the firm only a satisfied customer
Stuart
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This is the one I usualy get the stuff from http://stores.ebay.co.uk/The-Bits-And-Pieces-Place?_trksid=p4340.l2563
Hope this helps
Stew
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This looks very promising....... http://www.aluminiumwarehouse.co.uk/cutting_calc.php?gclid=CJ-9oMvx4K0CFQcSfAodcV839Q
I'm needing a piece 10" square x 10mm. Will order, soon.
David D
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:update: :update: :update: :update: :update:
Got the new base for the larger fly wheel made and the bearing housing plus one or two other bits, cleaned it all up and got it prepaired for painting but bin held up on this front due to the rain we've had the last couple of days. Taking the base round to men in sheds to have it planed and edged.
With a fair wind i should have it compleat next week.
Stew
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:update: :update: :update: :update: :update:
Well got it all together
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_3686.jpg)
(http://i431.photobucket.com/albums/qq32/sbwhart/Potty%20Simpson%20and%20Shipton%20Short%20Stroke%20Engine/IMG_3689.jpg)
I'll show some smatter pics and a vid later, at the moment i've got my Boss breathing down my neck, I've bin a bit obsessed with this engine, and the jobs are building up.
I think it looks great but my boss said its a bit too Tarty for me
:lol: :lol: :lol: :lol: :lol: :lol:
Stew
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Nice one Stew :clap:
Looks great :headbang:
How's it run with the bearing support? I suppose I'll have to wait for the vid' like everyone else!?
I'll show some smatter pics and a vid later, at the moment i've got my Boss breathing down my neck, I've bin a bit obsessed with this engine, and the jobs are building up.
I think it looks great but my boss said its a bit too Tarty for me
They'll never understand Stew..... Never! :palm:
Ralph.
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very ver nice , :drool: :drool: but where is the man and woman gone of the top :D :lol:
Peter
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Thanks Guys
Ralph:- posted the vid elsware but here it is any way
Pete I'll bring it with me when we nip over to you're place.
Stew
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Poetry in motion Stew! :clap: :clap:
Tarty! :bugeye: Hmph! (http://serve.mysmiley.net/rolleye/rolleye0011.gif) (http://www.footballerpictures.co.uk) ....... Well..... I like it! :thumbup:
Does that make me common?
David D
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Stew, it looks amazing, just right. I love the look of the flywheel with the painted rim. Flywheel is perfect, it runs and looks better with the extra bearing. Best one yet I reckon!
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Thanks Nick/Dave
I've just completed updating the drawings, so if any one wants a copy just send me a PM with you're email adress.
Stew
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:clap: great job stew, good looker and runner, another topnotch job. i would like a set of your prints if possible. i think you have my email. thanks in advance jonesie.
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Hi all,
I've received my drawings from Stew. I just hope I do him justice.
Good man! :beer:
Ron.
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Hi all,
I've received my drawings from Stew. I just hope I do him justice.
Good man! :beer:
Ron.
Ron after seeing your work on the web I am shore you will do it justice,
ps can you not go back to McLaren and sort them out please :doh: :doh:
Peter
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Hi Peter,
Believe me, I would love to go back except for the driving involved there and back home!
Ron.
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oooo nice