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Unread 08-02-2017, 15:56
Nathan Streeter's Avatar
Nathan Streeter Nathan Streeter is offline
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Re: Motor Speed offset

Quote:
Originally Posted by Garrin View Post
Hello all,


On our robot we have run into an interesting problem. We are running the kit of parts frame from AndyMark AM143U. We have the standard gearbox (ToughBox mini's) hooked up into VEX 217-2000 12V Motors.

When we drive the robot, one side spins faster than the other. Which in turn leads to our robot not driving in a straight line, even though the joystick is pressed into a straight line. So far, weight is pretty much evenly distributed. When we have our robot lifted, and the joystick pushed 100% forward, our robot will run for about 10-15 seconds before one full side stops moving completely. Our battery voltage drops from 12.5 volts to about 10.5-9.5v or so during the continuous run. Our robot registers no error codes during this time. I have a feeling that the problem is electrical, but I am not sure where to look. Any suggestions would be greatly appreciated.

Thanks,

Joe
Team 5720
Are you saying that when you have the robot "sitting on jacks" and with the wheels spinning in mid-air, one side of the drivetrain will lock up?

I'm guessing you have an overwhelming amount of drag in one side of your drivetrain. If possible, measure the current draw on each motor on both sides of the drivetrain. You should only be drawing a few amps per motor per side. If you're drawing more than a few amps per motor, I'd recommend removing that gearbox and confirming if it's assembled correctly.
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