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Twin Cylinder Steam Engine
Darren:
Decided to do a bit more to the crank webs tonight..
First thing was to drill and tap the holes for the clamping screws. I used a center and the mill to find the center between the two rods. The center finder is 5mm and the mill showed me a 1/2mm gap. Exactly as it should be :) So let the center finder kiss one rod and back away 1/4mm. Perfect.
Using the stop each piece was center drilled, note the use of a Stanley knife blade to lift the 4mm rod.
(the rods are 4 & 5mm dia, so from the center line the 4mm rod is 1/2mm shorter than the 5mm, the blade is exactly 1/2mm)
Drilling the 2.1mm hole right through. Note the liberal use of WD40, I find Stainless a bear to drill as it work hardens in a flash, grabs the drill bit and snaps it off. Or it just rounds the end of the drill bit.
So what I did here was use cobalt drill bits, plenty of fluid and peck drill leaving plenty of time to let things cool. It worked a treat.
Then I drilled 2.5mm to half the depth for thread clearance. Finally the remaining half of the hole was tapped 2.5mm.
Not a very clear picture, the parts where marked with a sharpie that Ralph left behind the other day :) and two center lines scribed with digital calipers from both sides. This leave two marks with a tiny gap in between. This shows the true center and any error clearly.
My slitting saw didn't like SS :( So I attacked it with a junior hacksaw..... :dremel:
A bit more cleaning up and they are done
Unless you are really sad like me, forget SS here, you might find brass to be much easier to work with :thumbup:
bogstandard:
Darren,
--- Quote ---Unless you are really sad like me, forget SS here, you might find brass to be much easier to work with
--- End quote ---
I was wondering how long it would take you to realise that barbed wire knickers hurt. Those crankwebs were a good example of self flagellation.
But you have done a great job with what you had.
Nothing against the way you did your slots as you achieved the correct result, it is just that I would have used a slightly different method to obtain the same result. There are always more ways to get the same results, and by showing them, people can choose the way they want to go.
The pic shows how I do it. If you take it steady, you can get results as good as a slitting saw.
I drew it up incorrectly, so I put my excuse at the top of the sketch. Makes it look like I am one of those brainy lefties.
John
Darren:
--- Quote from: bogstandard on May 01, 2009, 12:53:05 AM ---Darren,
I was wondering how long it would take you to realise that barbed wire knickers hurt. Those crankwebs were a good example of self flagellation.
But you have done a great job with what you had.
--- End quote ---
Yep, only bar I had the right size at the time, still is.......not that I would put myself through this again, I must shell out and buy some brass next time.... :poke:
Nice tip on sawing there, mine are off a bit but ok.
Darren:
I'd had a good nights kip and it's been raining all day so no garage building to tire me out today. So being nice and allert, instead of the usual deleted tired self I decided that I wanted to tackle something a little complicated this evening.
So I picked on the eccentrics as the plans suggested these could be taxing to produce.
Started with a 20mm SS bar, turned it to 18mm
I had a nice 4mm parting blade so I squared it off with the grinder and honed it with a diamond stone to give a good edge to cut the 4mm slots.
Parted them off and took them to the mini lathe to tidy up and true up the lengths. I used the mini lathe cos it's metric and easy to understand the dials as I dislike imperial measurements.
I used the lathe to find the center, lined them up on the mill and used the mill dials to set the off center by 3mm.
Finished with a 5mm drill bit
Drilled and tapped a bar 5mm and machined the off center to a true center :scratch:
Here I'm using the center finder to locate the position for the grub screw holes
Drilled 2.4mm and tapped 3mm for the grub screws
All fits nicely
You could say I'm
All turned out nicely and true to size, can't see what the fuss was about these are easy peasey to make, it's the rest that worries me :lol:
sbwhart:
Nicely done Darren
Your realy pushing out some good work :clap: :clap: :clap:
Stew
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