Quote:
Originally Posted by Infinity2718
If you run those calculations with the kit drive train pulley sizes and wheel diameters, does a 9mm or 15mm belt meet the strength requirements? Is pulley size the only way to get a drive system from failing?
What happens if all the weight of the robot rocks on two wheels? What happens if all the weight of the robot rocks on one wheel?
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The ratings are for a maximum recommended load over a long life, not ultimate tensile strength, so the belts aren't going to snap the instant your robot tips on two wheels.
Dozens of teams have run 15mm wide belts on 24T and larger pulleys and 9mm wide belts on even larger pulleys. These aren't about to snap. 9mm belts on 24T pulleys are pushing it. Smaller pulleys can lead to failure in a drivetrain. Load ratings are conservative and for use cases that aren't like FRC - using them as gospel here isn't necessary, and it isn't a poor decision to go with what's worked for many teams for several seasons, really. We push the rated limits of 25 chain all the time too.