"Hacking" a Mac floppy disk eject motor
From start to finish
A fair number of BEAMbots use a surplus Macintosh computer floppy eject motor (in particular, the eject motor from Sony-manufactured Mac floppy drives) as a gear motor.
These motors have a lot going for them -- they are strong, efficient, and (at least for the time being) easily available at swap meets and on auction sites for just a few dollars. The purpose of this tutorial is to show you how, starting with a surplus floppy drive, to yield a motor ready for installation in your robot.
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Step 1: Get a floppy drive, and "uncase" it
Step 2: Remove the motor from the drive
Step 3: Motor electrical rework
Step 4: Motor case trimming
Step 5: Providing for attachments and (maybe) a centering spring
If you're building a 2-motor walker, one motor will definitely need a centering spring; the other probably won't (so long as its rotational axis provides "lift" for the 'bot). Just to be safe, I'll cover both. Meanwhile, you may be using this motor on a head, so I'll cover that as well.
Step 6: Mounting the motor
These motors have a lot of odd, lumpy protrusions on all sides, so they can be challenging to mount to a 'bot. I've found a method, though, that works for me -- using a rubber, self-adhesive "bumper" (the thin, flat, disk-shaped ones, not the round "bumps") and cable ties.