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Sep 27, 2013, 11:48 PM
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Gearbox success


After many weeks of hacking gearboxes, the gearbox which finally had enough torque & hackability was the pololu 25D 75:1 gear motor.



Despite being enclosed, it actually unbolted. The pinion gear was removable without a pinion puller.






It's not a planetary gearbox. 1/2 the space is unused. The gears fall out all over the place when opened.


Then the pinion is press fitted on some 1/16" heat shrink on the stepper motor. This was very loose fitting, but the motor torque is so vanishingly small, it was believed to be tight enough.



Transparent heat shrink was much tighter fitting, but required loosening the gearbox slightly to keep from jamming.



The new motor fit snugly.



The new motor is glued on.


A rover platform can finally get around carpet using the stepper motors. The wheels aren't exactly parallel. It isn't perfectly level.




Using that particular gearbox with the matched brackets, wheels, & wheel adapters came to $67 + shipping. That's the price of making a very accurate drive train with stepper motors without machine tools.
Last edited by Jack Crossfire; Sep 28, 2013 at 12:12 AM.
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