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How long should a spur gear last? I go through a gear every couple of battery packs. Let’s assume your problem isn’t that you’re buying spur gears with the wrong tooth pitch, the motor and transmission screws are properly tightened, and the drivetrain isn’t binding. That leaves the two most common stripped-gear culprits: incorrectly set gear mesh and an improperly set slipper clutch. When properly set, there should be a tick of free play between...
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