Quote:
Originally posted by Frank(Aflak)
What if we just drill a shallow hole in the shaft and put the setscrew into that? with locktite, of course . . .
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This has been such a recurring problem that Woodie Flowers has addressed it at kickoff meetings more than once
and gone through the torque and pressure calculations to show that there is no way you can put a setscrew on a motor shaft and expect it to stay there without deforming and coming loose.
Or to put it more simply, in his own words, "Set screws suck!"
The next logical step is to put a screw or pin all the way throught the gear and shaft - this is almost just as bad. you have to put a large screw or pin in there, to be able to take the torque, which means you have to drill a large hole in the shaft, which leaves IT weak.
A slot and key is really the best way to go. Pins or set screws will work long enough to make you think your bot is fine. Then you ship it, and in your first match something comes loose or snaps and your motors spin and spin and bot just sits there like a very fancy statue!
there was one other solution that FIRST put in the kits a few years back, a gear that compresses onto a round shaft with a nut on one side. I forget what it was called, but I havent seen them in a while.