Originally Posted by
MalcolmF
I have a 3-axis version of this board and have noticed that it occasionally missed a few steps. I have read this thread start to finish and decided that the most likely changes to fix this would be to bypass the opto isolators, remove the 10k resistor for the power reduction circuitry, and replace the clock capacitor with a 100pF one. The first change (optos) made no noticable difference, at least on its own. The second did allow me to increase the speed by about 10% and subjectively everything seemed quieter and smoother. The final change, the clock capacitor, made a significant difference - it quietened everything down and allowed me to double the speed of everything. The issue is that after that last change when I push the jog buttons in LinuxCNC the machine continues to move for about 3 seconds after I release them.This is quite unacceptable and is potentially disastrous. I have tried all sorts of timings and within the range in which the machine functions it makes no difference. It happens on all axes.
Has anyone else had any similar issues?