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Originally Posted by Infinity2718
Define pushing it, what does that correlate to? When does it become an acceptable FRC design and the requirements it is held to?
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9mm wide belts with 24t pulleys are the setup I've had the least experience with, but in a 6WD WCD with 4" wheels, there were issues with ratcheting, and I believe belt failure was inevitable at some point. I have heard of several other teams failing belts in this configuration.
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How do you quantify a 24t pulley 15mm setup: What size wheels? What power input from the gearbox? That can be very helpful information to say we loaded our belts to X pounds and didn't see a a failure.
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In 2012, my old team ran a 4WD with 6" wheels, neither wheel direct driven, using a pair of 15mm belts and 27T pulleys. All good.
In 2013, we ran 6" wheels on a 4WD with a 4 CIM drivetrain, single speed, probably a 10:1 gear ratio or so. 15mm wide / 24T pulleys. Majority of the weight was on the direct driven wheel, so maybe not a perfect case study.
In 2014, we ran 4" wheels on a 6WD with a 6 CIM drivetrain, maybe a 7.5:1 gear ratio? (around 12 FPS). This robot had the most run time of any of our robots, with at least 100 hours put in to practicing with both a competition and a practice robot, and obviously that game had plenty of pushing defense, so in a way this was the hardest test of this belt setup yet. Never ratcheted, never failed, no issues at all.