MadModder
Gallery, Projects and General => Project Logs => Topic started by: rleete on July 19, 2009, 09:03:36 PM
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Inspired by the thread Stew posted, I decided to try making one of Elmer's rocking piston engines. As usual, I just couldn't leave good enough alone, and made some of my own changes. The most obvious one was to bore the cylinder through, and add an end cap like Mklotz of HMEM did. The cap is actually 2 pieces, with the tube threaded into the end of the cap. The second was because I didn't have any flat head screws, so I bored out the crank and used a button head. The base is not attached by a screw, but press fit and cold riveted over. I also soldered the bushing into the side, after running it and finding it flopping all over.
My first running engine, which happily ticks over on less than 1 P.S.I. I can actually keep it going on lung power alone, but that will make you dizzy in short order. At 20-25 P.S.I. it screams along like a weed wacker.
(http://i545.photobucket.com/albums/hh381/rleete/DSCF0139.jpg)
(http://i545.photobucket.com/albums/hh381/rleete/DSCF0140.jpg)
(http://i545.photobucket.com/albums/hh381/rleete/DSCF0141.jpg)
(http://i545.photobucket.com/albums/hh381/rleete/DSCF0142.jpg)
I only had to remake 2 parts, which is astounding in itself. The first was the shaft, because I tried to use drill rod, and snapped the tap off in the end. Remade in brass. The other was the inlet tube, which I single point threaded 6-32. When I drilled the through hole, it broke through the minor diameter of the threads. So, I refaced it, and cut the threads to 8-32 instead.
Runs pretty nice (sounds exactly like Stew's in his video), and was a big hit this afternoon with the neighborhood kids. They especially liked it when I ran it wide open on 25 P.S.I. I'm pretty impressed that I got the whole thing done so quickly, and that it ran right away.
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Roger,
Alright, you got a couple of runners. Great.
This means I need to schedule a visit soon. I need to see those engines in person.
Bernd
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Like the cat singing "I'm gonna get ya little fishy" we all bit the bait.
Looking Good
Robert
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Stew has got a lot to answer for, it seems everyone is making these little devils. I just might have to take a bit of time out to knock one up for myself, to see what the fascination is all about.
Very nice looking job with yours Roger, I do like the contrast effect between the different metals.
Bogs
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Nice one Roger
:clap: :clap: :clap: :clap:
Like the contrasting metals
They are fun little engines, I wonder if any of those kids you showed it to will be inspired it to take up engineering you never know.
Have fun
Stew
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Nice one :thumbup: :clap: :thumbup: :clap:
I might have to put one of these on the (Growing) list of things to make.
Well done,
Tim
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Great job buddy!!
Chris
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Another one... :doh:
:) :) Well done, If I wasn't so busy I'd be out there with everyone knocking one of these up...maybe later...
Nice looker that one :thumbup:
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great work only wish I had the time at the moment weekend seem to fly by
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By the time I get round to one of these it'll be old hat!!! :bugeye:
Nice looking little engine Roger :clap: ............ You know we still want to see a video though don't ya? How about the lung powered one with you going dizzy :lol: :thumbup:
You've certainly sprung into action :nrocks:
I'm going to have to pull me finger out eh?!
Ralph.
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Think I'll have a go at one too just as soon as the garage is sorted! :doh: :proj: strikes again!
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Hey Roger :poke: Video? :wave:
Well I've got to try and get one off you eh? :)
Ralph.
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I missed this one!
Looks very nice! :bow: Tell me about the base?
Eric