2016-11-21 (M) Clockwork Theremin

 A wide disc of hardboard (HDF) was cut in a rough circle on a band saw. The circle was refined on a sander. First, the sloppy edges were taken down to the edge of the circle. Second, the whole disc was spun on the belt sander to wear off the uneven edges. This technique allowed for larger circles than possible with a hole saw. It was shown to me by another hack space member who happened to be making wooden discs as well.

Circle cut from hardboard

Once a good disc was formed a hole cutting drill bit was used to remove the inner area for the motor. This was the same bit used previously when a hole was cut in the gear board. Fortunately, no one had adjusted it since it was used. The disc was clamped down and cut from both sides to reduce hole blowout.

 Cutting inner part of motor riser plate

The hollow disc felt like a frisbee so I managed to get a mid-air shot

The motor and the mending brace adapters were placed in the donut-shaped hardboard and holes were marked where the bolts would be placed. Those holes were dented with a scratch awl, given pilot holes, then drilled from both sides.

Drilling the adapter plate

All the bolts aligned and the plate, motor, and gear were fastened back on the board. The increase of 1/4" (6mm) was enought make the gear teeth mesh together. Power was applied but there was no appreciable motion. This was hopefully due to the power supply which was rated for 2A. The motor drew 1.4A unloaded. Another power supply should be tested soon.

Gear board with motor on the adapter plate

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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2016-11-17 (Th)