2016-09-20 (Tu) Clockwork Theremin

The second largest diameter gears were 500mm plus the teeth and would not fit on the plastic sheets. The largest diameter gears only fit because they were printed with half the teeth. 1/4" (6mm) hardboard was purchased to make these gears. Hardboard could have been used for the whole project but it is more difficult to work with and heavier. Low inertia will be important for these gears which only have a small motor to drive them.

Gears were adhered to the wood the same as plastic, using Super77 spray adhesive. They were then clamped to a table with a long steel bar to distribute the pressure. A jigsaw was used to cut out the teeth as before.

Jigsaw and clamp used to cut gear teeth

When all the teeth were cut from the 500mm gear a picture was taken with my left hand as a size reference. Cutting hardboard was slower and more difficult than cutting plastic but it smelled better. The plastic was softer and less prone to flaking plus the friction of the saw blade was enough to slowly cut with the sides and back of the blade so tighter turns could be made.

Large gear cut from hardboard

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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2016-09-10 (Sa)