Drivetrain consistency issue

I am using a drivetrain configured without a gyro. In my autonomous program, I have a command ‘drive forward for 20in’. The robot travels anywhere between 18.5 and 21in. How do I make the robot move consistently forward for 20in.

slow it down.


We are at 50% - still not consistent.

Can you post a video? That is a massive variance.

You might have friction issue - wheels rub against the supporting beams. We had similar issue before. Once we add some washers (2 per wheel), that will clear the wheels against the beam. We have much consistent run since.


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