hi i have a home brew CNC mogul cnc..version 1 that i bought used recently so i do not know if this ever worked ok or not..

i know it uses a pretty crappy chinese knockoff TB6560 controller/driver and im leaning towards its just bad

issue is all 3 axis motors sound like crap and are herky jerky movement...i use mach 3 as communication between machine and pc via parallel cable...using a very very old laptop Dell C610 with parallel port built in and with windows 7 on it

no steps lost though

just very sporatic movement and lots of stuttering and inconsistent movement speed and smoothness during toolpath..causes lots of vibration..

i tried swapping with new stepper motor..no change
i tried removing stepper motors from railing to rule out v wheels bearings ...no change
i tried swithcing to diff micro step settings no change
i tried increasing voltage on drivers..already was max..no change
tested voltage coming from power supply ok 24V
reseated all stepper motor connections no change

and ideas?