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Steam engines will also run on compressed air. I would suggest starting with one of Elmer's engines. I am working on my sixth one currently. The wobbler is a good one for a beginner. Plans can be found here.

And finally milling the two sides and rounding the corner.

Now over to the mill to drill and tap all the screw holes, and drill and mill the steam passages.

Here is the start of the cylinder.

Here is the crankshaft.

Here is the front bearing.

Here is the rear bearing.

Part #2 done. Here is the foot.

If only it were that easy.:D

Here is the start of my build of Elmer's geared. This is my favorite of Elmer's. I have put off building this one because of the cost of the gears but I came to the realization that they will most likely not get any cheaper and I knew that I would definitely build this one someday. When...

After using the mill a few times now with the scales I am definitely glad I got them. It is so much easier than counting turns. These were something that I debated getting ever since I got my mill about a year ago. Now I wish I would have gotten them sooner. I also ended up putting one on my...

I added digital displays from Grizzly to my mill. I decided to go with the stainless steel ones as opposed to the aluminum ones. The stainless ones are supposed to have better accuracy. I haven't used the mill yet since installing them. I know these don't compare to a real DRO but it should...

Thank you. I am thinking that next I will make Elmer's Geared. The gears are quite pricey but since this engine is on my must build list I might as well bite the bullet and buy them now. I am sure that the price will only go up so the longer I wait, the more I will end up spending.

Here is the video of it running. http://youtu.be/AliXNUD3EYA

Here is my completed Comber Rotary. It is the fifth Elmer's engine. The build log can be found here.

Here is the video of it running. http://youtu.be/AliXNUD3EYA

Yes, the center line of the bearings is 1/4 inch lower than the center of the ring (which is equal to half of the stroke). The ring is sort of an elliptical shape. I just finished up making brass bushings for the rollers. I was getting some binding and I hope the bushings take care of that...

Here is the completed engine. I did run it for a short time yesterday. It requires about 15 psi to run. I will post a video after I do a little fine tuning to get it to run a little smoother.

Finished the flywheel today (other than the threaded hole for the set screw). I should have spent more time with the hacksaw cutting the corners off of the chunk of aluminum I had on hand. It took a long time to turn the rectangle down to a circle. I really should invest in a band saw. I...

Made two cylinder heads. Also made the piston and piston rod. I Locktited the piston to the rod instead of soldering it. I assume that the Locktite will hold good enough. I also made the two rollers. All that is left are the two forks and a flywheel.