[EricH]

Originally Posted by TubaMorg

Actually, as most new teams can attest to, if you send the same pwm signal, and your Victors are calibrated and outputing the same voltages to both sides, the final drive speed for each side will almost ALWAYS be different. That's why every team is dismayed the first time they turn their robot on and it drives in circles. The reason, as pointed out in previous posts, is that every motor is slightly different. The difference is compounded when you factor in varying amounts of friction from additional drive train components. Also, motors tend to have a bias so that they turn different speeds in different directions when the same voltage is applied. I bring this up because your motors on the left and right sides are likely spinning in opposite directions.

He was talking about the same side, same motor, like you might get for a team running an AndyMark shifter system. And, if we're talking CIMs, I believe that the bias is less than the difference between motors.

Now, if it's two different motors on the same side, you've got about 30 days to start designing a gearbox so they'll be the same speed.