Hi
looking for some ideas on the strange behaviour of my A axis setup
I've justed added the driver, a DM542A from Longs motors
Set up Linuxcnc and mapped a couple of spare output pins on parport 0 to the Step and Dir on the stepper driver
Also added a 5volt feed to the stepper driver

The green LED is lit and the red LED is not lit

I can jog the A axis through gmoccapy, but its anything but smooth and its faster moving in one direction than it is in the other
I did a quick and dirty test and it appears that one rev of the motor clockwise is 50 units on the display, but 25 units the other way completes the 1 rev anti clockwise

Does it matter that the 5 volts is not from the BOB, its 4.6 volts, so I though this would be fine, but can run a wire from the BOB to the stepper driver.

I may well have something wrong in Linuxcnc, but why would it jog 2x as far in one direction than it does in the other

Any help much appreciated

Cheers,
Paul