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Step 3Mount the top CD onto the potentiometer
The potentiometer I got from Radio Shack for $2.99 plus tax came with a small, thin washer and a thin nut to allow it to mount behind a panel. It also had a very long shaft, for some reason.
The first thing to do is secure the shaft and cut threads in it with the 1/4-20 die. The one I used turned out to be made of aluminum, so the cutting went very smoothly, but the threads aren't as strong as they could be. They are strong enough, though.
Take the washer, and center it below the hole in the center of the CD-ROM. Mark the diameter of the center hole of the CD onto the washer with a pencil. Now, use your tin snips and cut the washer's diameter down until it fits exactly into the center hole of the CD-ROM.
The potentiometer also has a "bump" on the surface to keep it aligned in the panel. Drill a hole in the CD-ROM to make use of that feature. Between proper placement of the alignment hole, and exact cutting of the washer, your potentiometer will be in the exact center of the carousel. Tighten down the nut, and your CD is securely mounted.
Thread on one of the 1/4-20 hex nuts, onto the shaft of the potentiometer.
The first thing to do is secure the shaft and cut threads in it with the 1/4-20 die. The one I used turned out to be made of aluminum, so the cutting went very smoothly, but the threads aren't as strong as they could be. They are strong enough, though.
Take the washer, and center it below the hole in the center of the CD-ROM. Mark the diameter of the center hole of the CD onto the washer with a pencil. Now, use your tin snips and cut the washer's diameter down until it fits exactly into the center hole of the CD-ROM.
The potentiometer also has a "bump" on the surface to keep it aligned in the panel. Drill a hole in the CD-ROM to make use of that feature. Between proper placement of the alignment hole, and exact cutting of the washer, your potentiometer will be in the exact center of the carousel. Tighten down the nut, and your CD is securely mounted.
Thread on one of the 1/4-20 hex nuts, onto the shaft of the potentiometer.
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