I've been trying a few things before replacing the drivers and/or stepper motors. I ran a 2D program, that cut a name plate. The program was 5200 lines long, and cut 1mm deep in two pecks. I'm looking at the difference in position between the upper and lower level. The lower level is out of position to the top one. I ran the program twice, once with the feed rate set at 1000mmpm and acceleration at 50 and once with feed rate set at 400 and acceleration at 10 (on motor tuning). If this was a problem with losing steps due to over accelerating or going too fast I'd have expected a noticable difference in the test pieces, but there isn't. The movement between the two levels is +0.35 in Y and +0.2 in X. Actual size of the sign (80mm x 40mm) is within 0.1mm -which is reasonable measured with a digital vernier and allowing for possible cuttter wear. Any suggestions where to go next gratefully received, as I'm not too sure right now.
Regards Kevin