I tried turning up the trim pots until the motors were very hot to the touch when running for a couple of minutes. Same problem, so not a low voltage issue.
I have a new hypothesis.
The motors I am using are VEXTA 2 phase 5V stepper motors (got them cheap).
I did my best to find the wiring for the steppers that best worked as I am stepping down from a 6 wire to a 4 wire configuration. I did not have a multimeter when I started this, so I may have paired off the two phases incorrectly. I may have hooked one pair to the common and ground and the other to the primary and ground. That would, I think, throw off the accuracy of the rotation by a good bit. I am going to try testing the pairs I have on each motor to make sure that both pairs are throwing back the same resistance. Wish me luck!
I have a new hypothesis.
The motors I am using are VEXTA 2 phase 5V stepper motors (got them cheap).
I did my best to find the wiring for the steppers that best worked as I am stepping down from a 6 wire to a 4 wire configuration. I did not have a multimeter when I started this, so I may have paired off the two phases incorrectly. I may have hooked one pair to the common and ground and the other to the primary and ground. That would, I think, throw off the accuracy of the rotation by a good bit. I am going to try testing the pairs I have on each motor to make sure that both pairs are throwing back the same resistance. Wish me luck!