2016-09-25 (Su) Clockwork Theremin

Experimenting with the miniature version of the theremin made it quite clear that driving a large gear directly from the motor was a poor choice. This was supposed to be a 200mm gear but that would likely prove unworkable.

An internal ring gear [convenient list of gear types] was the easiest choice since it could be hidden under the 200mm gear. This type of gear uses teeth on the inside of a cylinder and can be driven by a regular spur gear from the inside. Rather than research the intricacies of this gear, an existing model was found on Thingiverse by Jag. His planetary gear reducer was downloaded and the OpenSCAD files were modified to produce an isolated internal ring gear.

Model of internal ring gear

Before printing, the model was changed from the one shown above to one with mounting holes and a solid bottom. The purpose of the solid back was so that the small gear would not catch on the spokes. The mounting holes were placed beyond the rim of the gear so no screws would be inside because that could also cause the gears to snag.

Parts list:

The rest of the posts for this project have been arranged by date.

First time here?

Completed projects from year 1.

Completed projects from year 2.

Completed projects from year 3.

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2016-09-13 (Tu)