Finding the bind.
This is our third year using tracks. Remove the chain from both motors with the robot on blocks. Spin the tracks by hand, they should move real easy. If that passes the test, set the machine on the floor with full weight and push the bot against the friction in the tracks. If this passes muster, then the problem is located in your gear reduction or motor mount. Use a DC ammeter to check current when the robot is on the blocks, that will tell you alot about excess friction or binding. Our bot for 2001 used two bosch motors and two FP motors, one of each directly driving the track (two inch timing belt with 3" pulleys). We found that you could still drive the bot even with 2 dead FP motors still coupled to the tracks. That is a lot of extra load. The bosch motors were in low gear with a 1 to 1 ratio to the 3" pulleys, roughly 5fps with no load. If you are geared for real high speed, that could be your problem as well. Speed is good, but not if you can't do anything when you get there.
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