[balsaman]

Hu, the drive counts the encoder pulses. I have eliminated that as the problem. I am no expert...just know enough to be dangerous.

Al, there is backlash, but the error accumulates the longer the machine is run. Backlash errors are not cumulative.

Mariss, I used one wire from a pair for A, another from a pair for B. The +5 and 0V are on a twisted pair. The rest of the wires (one pair, and the two left over from A and B) are cut off on the encoder end, folded over and taped on the drive end. Will tieing them to ground at the drive end help? If I make the +5 and 0V the wires twisted with A and B I have to open the encoders and resolder. I can do that if it's the best way.

Thanks,

Eric