Working Oscillating Steam Engine MKI
by cbabbage, published
I started first building a horizontal double action steam engine (you can see it in the background of the video link below,) but while working out some bugs on that one, I decided to knock this one out quickly and post it first.
You can see a video of it in action here youtube.com/watch?v=BIfqFAG5olU&feature=share
I will call this engine the Mark I, just in case I build an enhanced model down the line.
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For those looking to cast this in aluminum using the plastic parts as patterns, Bre Pettis assures me that PLA burns out of a mold just like wax and is non-toxic. Instead of lost wax casting, you get 'lost PLA casting'.
Nice design and well done with the instructions, but like Bluemetal commented back in 2012 the clearances are a bit on the generous side. On the STL's all the holes are 1mm bigger diameter than all mating parts. If your printer is accurately calibrated then all the fits will be very sloppy. It will work but it wont be smooth, and it will take a lot more air to run than it should. Perhaps if your printer tends to print holes a bit on the small side and OD's a bit on the large side then it will work better. My only other comment is that the cylinder block could be a bit wider so that it covers the air supply port all the time. As it is, the air can escape when the cylinder is at its CCW extreme travel. I have a lathe and have bushed the main bearings with a brass tube. I plan to re-make the piston and cylinder so that I can make it work efficiently with a pump up garden sprayer as the air supply. I will be making the piston large enough diameter so that I can sand the surface smooth, as the ridges from the print layers act as a rattle going in and out the cylinder.
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If anything is unclear, please feel free to post a comment or message me, and I will answer your questions.
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