AC Motor Cooling Fan

3D Model: 

While repairing the AC motor on my lathe, I managed to destroy the dry-rotted plastic cooling fan mounted to the shaft. Since a replacement is somewhat difficult to source, I thought I would try to make one myself. The motor and its components are oddly-sized, so I wrote the OpenSCAD module to be fairly parametric so that it may be useful in more common applications.

For those curious, my lathe is a 3-in-1 Shopmaster El Dorado made in 2000. Unfortunately, mine wasn't built with the Quadralift option that allows the operator to easily raise and lower the milling head.

The fan is installed on the lathe, and has a few hours spinning at 1750 RPM with no catastrophic failures. The fit was a little tight and some of the layers were a damaged when I installed the fan. There's a steel guard enclosing the fan, so I'll leave it where it is and see if it holds up to more use. In the event that it fails, I may loosen the fit and add a set screw in a future design.

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