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Steam / Compressed Air Engine

by Gizmoguyar, published

Steam / Compressed Air Engine by Gizmoguyar Nov 16, 2012

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26494Views 9019Downloads Found in Buildings & Structures

Summary

This is just something I made for fun. It's a locomotive style reciprocating (1/2 stroke cycle) steam engine.

I didn't originally design it to run, just be a model. But after some careful sanding and filing, as well as liberal amounts of graphite, it does run on compressed air.

I may modify it at some point. ...Give it a larger piston and larger valve ports.

Here's a quick video if you want to see it run (Sorry about the aspect ratio).

http://www.youtube.com/watch?v=FfVjyoL2gy8&list=UUKo5IpKOhxv8yhSzxeK-l0g&index=1&feature=plcp

Instructions

I've included the nine (9) parts as STL files. And Also a Rhino model file if anyone wants to modify it.

The AirEngineComplete.stl is simply for the image.

It should be fairly self explanatory to put together. The shaft on the flywheel is a little bit too long. So unless you plan to use it as a power takeoff you'll probably need to cut it down.

As always I'm happy to help answer questions etc.

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Anyone else having trouble getting the piston to fit? Mine is about 1mm out.

You figure this out? My piston was 1mm too big as well as the valve. The housing and Flywheel support were too big to fit the slots in the base. But the pushrods fit their respective locations perfectly on all pieces so I cant scale anything down or the holes will be too small.

I can't replicate this on either a MakerBot Replicator 2 or a Stratasys uPrint SE. I know from experience that all slicers interpret the stl differently, and may not account correctly for the width of plastic extrusion. The valve was designed line to line, so it definitely will require some careful sanding to get it to fit, but it shouldn't be 1 mm. I'd recommend trying to scale the entire assembly my a very small amount (maybe 0.01 to 0.03) and see if that solves the problem. Or maybe try a different slicer. Hope that helps.

There is something wrong with the piston valve housing stl file, it won't load into makerware, and when i load it with solidworks there is nothing in the file. Please re-add that file to the rest.

Scratch that, I just downloaded it separately and it worked

I'd a similar issue, the full package download appeared to have a 0 byte file but separately it was fine.

Downloading "all files" and the zip has piston housing as a 0 byte file. I downloaded it separately (note there is no view or icon for this part on thingiverse) 54MB in size and repetier says it's not manifold.
I put it into 3Builder and it says the file has invalid data and performs a repair. File is now only 9MB in size and slices perfectly.

Looks awesome, can't wait to finish printing it.

Can you post am .stp for the base my printers bed is to small to print that part.
thank you
 

I've a small printer, I'm going for 70% scale printing across the board.

I've a reasonably successful print at 3/4 scale, smoothed the bore with a wrap of glass paper but will be reprinting the piston at a slightly smaller size. I've a warp on the flywheel so will have to go again with that.

Looking at fitting, I like the small fastener solution on kccom's build. I should be able to replicate this on the 3/4 scale version: http://www.thingiverse.com/make:201422

I love this model, hope to show a build running soon. Aiming to run using a garden sprayer as the compressor/accumulator.

Steam / Compressed Air Engine
by kmccon

Unfortunately it appears my version of Rhino can't export .stp files. But if you'll tell me the size of your printer bed I'll scale the base and upload it.

9.81m/s^2 or 32.2 ft/s^2
An average of course and contingent on you being on this planet:)

umm...The invisible attractive force intrinsic to all mass?

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