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Unread 17-01-2004, 00:48
Veselin Kolev's Avatar
Veselin Kolev Veselin Kolev is offline
X51 Production Company PGM (TM)
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Re: Drill Motor Gear Specs?

Never underestimate the strength of those small motors. If you really wanted to, you could do anything with the pinions. For example, my team had many left over fischer price motors, so one day I took one home and swapped out pinions. I first used a diamond dremel cutoff wheel to cut a slot into the gear, almost to the shaft. Then, I ground off the teeth of the gear (of course with the motor covered so shavings dont get in it). Then I put the gear into a vice, put a hardened steel pin to the shaft and yes, smacked it with a hammer until the motor popped free. The motor and shaft were in perfect-looking condition, so I commenced in "pressing" the new gear on. This was a little more tricky to do... First I determined the diameter of the hole in the new gear, drilled it, and prepped for "pressing". This was the hard part; I first put the motor in a vice. Then, I took a .5" peice of aluminum, and drilled into it a hole with the diameter of the outer diameter of the gear. This way, you put the gear in the plate, put the gear onto to motor, and smack away with a hammer, yet again. The end result was pretty good, but I wouldn't ever use it on a robot. Don't be ghetto. Do it the real way. To test this gear, I rigged it up so that the shaft was clamped down, and I got some huge vice-grip clamps around the gear and twisted as hard as I could. That was like a 15 inch lever, and it took a lot of force, I'm guessing 50 foot pounds to make the thing twist a little. So... the moral of the story is that you can do this for small projects, but not robotics. If I made a drive train that used this method of pinion removal, every match we played, I would be praying. Yea... as Andy Baker and Paul Copioli do, just use an arbor press. Makes life a lot more secure. As well as your drive train.
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