Low Temperature Differential Stirling Engine: Crankshaft

The crankshaft is the axle that connects the flywheel hub to the piston assembly. It is made of two parts: a rectangular aluminum piece and a rod of steel fitted together.

First, I cut the rod off on the cutoff saw. Since the rod was so small (and steel!), I decided to grind it down to size on the grinding wheel. I sized the rectangular piece similarly.

Next, I drilled and tapped the holes in the rectangular piece. There are 3 holes: one in the center, for the steel rod to fit into; one on the front but off center to allow for the up and down motion of the displacer to move the shaft; and one to add counterwieghts to the latter.

Finally, I fashioned a small aluminum round which fit into the displacer rod ring on the lathe and screwed everything together. The crankshaft was finished!

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