Author Topic: Rocking Engines (Read 36104 times)

NickG · « **Reply #25 on:** July 15, 2009, 07:13:48 AM »

John,

I made an oscillator with 1/4" bore and about 3/4" stroke with a slight design floor, at 90 degrees before TDC when exhausting the with of the cylinder wasn't big enough to cover the inlet port so there is momentarily an air leak and you can actually hear it, even when running at speed! It uses a lot more air than an engine of that size should too!

Nick

sbwhart · « **Reply #26 on:** July 15, 2009, 02:11:03 PM »

Hi Chaps

Well I made a new piston and fitted it all together

AND

ITS A RUNNER
But

It'll only run upside down

What I've found that it ony needs a whisper of air any more and it just locks up in the forward position.

To get it running correct way up I think I need a better fit in the bearing, also the contact area on the bearing is only small so I'm thinking I may change the design to increase the contact area so you get a better fit without slop.

Also took a video but I can't get it to play my machine use to open the up as microsoft media player but for some reason its taken it in its head to open them a nero don't know why

but it wont run now.

What with upside down running engines and computers with an invisable hand lifes getting spooky.

Fealing strange

Stew

Stilldrillin · « **Reply #27 on:** July 15, 2009, 02:20:27 PM »

Stew,

Well done (so far) with the Aussie engine!

"Fealing strange" ??

You wait a while into retirement, then the whole world will feel strange. BUT you`ll be used to it by then......

David D

raynerd · « **Reply #28 on:** July 15, 2009, 03:56:35 PM »

Get the camera back out Stew when you get a chance - would like to see it running upside down or not! Keep us informed.

Chris

rleete · « **Reply #29 on:** July 15, 2009, 04:19:52 PM »

Quote from: sbwhart on July 15, 2009, 02:11:03 PM

also the contact area on the bearing is only small so I'm thinking I may change the design to increase the contact area so you get a better fit without slop.

Did you press fit the sleeve (the .188 diameter tube) into the cylinder/frame part? I think that's how it's supposed to work (and how I am making mine) so that you get the full length of that sleeve as a bearing surface. No instructions along with the plans, and not even any tolerances specified, so it's not completely clear how it is supposed to go together. I'll have to have another look at the plans.

sbwhart · « **Reply #30 on:** July 15, 2009, 05:04:49 PM »

Quote from: rleete on July 15, 2009, 04:19:52 PM

Quote from: sbwhart on July 15, 2009, 02:11:03 PM
also the contact area on the bearing is only small so I'm thinking I may change the design to increase the contact area so you get a better fit without slop.

Did you press fit the sleeve (the .188 diameter tube) into the cylinder/frame part? I think that's how it's supposed to work (and how I am making mine) so that you get the full length of that sleeve as a bearing surface. No instructions along with the plans, and not even any tolerances specified, so it's not completely clear how it is supposed to go together. I'll have to have another look at the plans.

No I didn't press fit the sleeve in, but thats how I was going to change the design I'm planning to sweat the sleeve in with soft solder.

I think we have a case of great minds thinking alike here

.

Thanks for your input and suggestion, its a real nice sweat running engine even though its upside down because of the low air pressure it ticks over lovely with puff puff puff and you can see the action, really worth the effort of making one.

Thanks again

Stew

NickG · « **Reply #31 on:** July 16, 2009, 05:05:53 AM »

Well done Stew!

The only thing is, you do these little fill in projects too quickly!!! You can't put off the frame assembly any more now ahaha!

rleete · « **Reply #32 on:** July 18, 2009, 12:39:25 AM »

Stew, may I ask how long it took you to make the parts? The reason I ask, is because I'm making the same engine - with a few of my own touches.

I'd like to know just how fast some of you guys can whip out parts.

sbwhart · « **Reply #33 on:** July 18, 2009, 01:39:15 AM »

Quote from: rleete on July 18, 2009, 12:39:25 AM

Stew, may I ask how long it took you to make the parts? The reason I ask, is because I'm making the same engine - with a few of my own touches.

I'd like to know just how fast some of you guys can whip out parts.

To make all the bits for two engines it took me about 6 hours, I've been playing around trying to get them to run and to remake bits about the same length of time I've still got a couple of hours more work to do over this week end to get them running the right way up.

Hope this helps

Stew

foozer · « **Reply #34 on:** July 18, 2009, 02:42:57 AM »

Quote from: sbwhart on July 18, 2009, 01:39:15 AM

Quote from: rleete on July 18, 2009, 12:39:25 AM
Stew, may I ask how long it took you to make the parts? The reason I ask, is because I'm making the same engine - with a few of my own touches.

I'd like to know just how fast some of you guys can whip out parts.

To make all the bits for two engines it took me about 6 hours, I've been playing around trying to get them to run and to remake bits about the same length of time I've still got a couple of hours more work to do over this week end to get them running the right way up.

Hope this helps

Stew

Made two pieces so far for a rocker, machine time about 22 minutes (timer left over from the treadmill motor mod) Time spent in barn? good thing I'm retired and dont watch the clock

sbwhart · « **Reply #35 on:** July 18, 2009, 06:24:58 AM »

Well got the little gem running right way up, not without a bit of trama, any way a little up date.

As you know I had a bit of trouble getting the piston crank drilled in the correct position so what I did is make a little drilling aid, it was a simple bush that I slipped the con rod through to grip the piston for drilling I was then able to pick the edge of the vice up and Zero my dials and index to the correct position for drilling, worked like a dream.

This is the bush with a piston in place

And this is it in use

Then instead of a lose bush thing that the drawing shows I made a bearing with a 4mm hole and shouldered to fit into the cylinder, I soft soldered this in place using solder paste, great stuff this for little jobs

Turned down the spindle for a nice fit in this bearing.

At first when I assembled it together it still wouldn't run right way up but it fiddled with it a bit tried a tighter fitting piston this didn't work, I'd gaven it a good oiling so stripped it down cleaned all this oil off and tried running it dry and away she went right way up wrong way up any way which.

And as

I'm down loading a vid from my lap top onto youtube its taking an age and I'm running out of time Boss wants some of my time so you'll have to wait for it

Stew

sbwhart · « **Reply #36 on:** July 18, 2009, 06:38:06 AM »

The Move

Do you like the exit stage left

Realy having fun

Stew

Andy · « **Reply #37 on:** July 18, 2009, 08:40:00 AM »

It makes a great sound. Really like that.

Stilldrillin · « **Reply #38 on:** July 18, 2009, 11:23:21 AM »

Well done Stew! That`s a crackin` little engine!

It`s got a nice sound to it.....

Classic exit!

David D

foozer · « **Reply #39 on:** July 18, 2009, 11:33:39 AM »

Quote from: sbwhart on July 18, 2009, 06:24:58 AM

Then instead of a lose bush thing that the drawing shows I made a bearing with a 4mm hole and shouldered to fit into the cylinder, I soft soldered this in place using solder paste, great stuff this for little jobs

Stew

Solves one issue. Even with a press fit not a lot of meat to secure the bushing. Solder, ah yes, but yet another opportunity to muck things up.

Good Job

Robert

Darren · « **Reply #40 on:** July 18, 2009, 02:09:08 PM »

Brilliant Stew, they look like cracking little engines....

sbwhart · « **Reply #41 on:** July 18, 2009, 06:13:26 PM »

Thanks Chaps just got to get No 2 running tomorrow, they've been an enjoyable little engine to build and they are a joy to watch and hear run.

I'm all eager to start and put that Loco together now

Cheers

Stew

Divided he ad · « **Reply #42 on:** July 19, 2009, 10:42:20 AM »

Right.... Now I'm going to have to make one!!

Nice little machine there Stew.... Hopefully #2 is as good a runner?

Back to the loco.... Video next weekend?

.... Well you got to say it really

Ralph.

Bernd · « **Reply #43 on:** July 19, 2009, 07:58:07 PM »

Nice job Stew. like that sound too.

Bernd

sbwhart · « **Reply #44 on:** July 20, 2009, 01:23:23 AM »

Well got Rocky 2 running and its better than Rocky 1 gave it a blast of WD40 it doesn't seem to be pressure sensitive wound the it up to max and it fairly bussed along. Took a vid of both running then spent the whole of last night trying to down load it on youtube it would get part way through then fall over,

any one else had this problem is it band width or the demand on the server

Have fun

Stew

raynerd · « **Reply #45 on:** July 20, 2009, 02:36:45 AM »

Hey Stew, sorry but I must have missed this a couple of days ago! Great news that you have finished it and the sound it makes is amazing. I am certainly going to have a go at one of these.

Regarding youtube - if your on broadband it really should be timing out! How big is the vid?

Chris

sbwhart · « **Reply #46 on:** July 20, 2009, 03:10:41 AM »

Quote from: craynerd on July 20, 2009, 02:36:45 AM

Regarding youtube - if your on broadband it really should be timing out! How big is the vid?

Chris

Never thought of time it is a bit of an epic, I'll try shortening run time.

Thanks for the suggestion

Stew

NickG · « **Reply #47 on:** July 20, 2009, 04:38:10 AM »

Stew,

I haven't seen the video yet but well done, keep picking up lots of tips and tricks from you! I have a pot of that solder paste and it is brilliant, I use it as a flux more than anything, I always feel the need to feed a bit more solder in for good measure!

Nick

Stilldrillin · « **Reply #48 on:** July 20, 2009, 08:05:44 AM »

Quote from: NickG on July 20, 2009, 04:38:10 AM

Stew,

I haven't seen the video yet but well done, keep picking up lots of tips and tricks from you! I have a pot of that solder paste and it is brilliant, I use it as a flux more than anything, I always feel the need to feed a bit more solder in for good measure!

Nick

Ok Chaps!

Where do I get some of this posh pastey solder stuff?

I usually bung up me little steampipes, with too much solder.......

David D

sbwhart · « **Reply #49 on:** July 20, 2009, 08:13:35 AM »

I got mine from Blackgates engineering

www.blackgates.co.uk

Its real nice stuff to use as you put a lot on and it seams to shrink when you heat it up, your just left with a slight film thats dead easy to clean up. It seams to work ok without flux as the solder is in a solution of flux already.

Hope this helps

Stew

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Author Topic: Rocking Engines (Read 36104 times)