Originally Posted by
Jakeller449
I built my own machine. Its approximately 36"x44" 1/2-10 single start lead screw driven. UCCNC. UC100. G540 controller with Nema23 389oz/in 3.5A stepper motors and 48V 7.3A power supply. Gantry is run by master/slave combo.
I have this bug that just recently started showing up more frequently. It seems to be isolated entirely to cutting interpolated circles. As the program starts running, it will randomly trigger a E-stop in UCCNC. I can clear the fault and cycle start and the program will run for another second or two before triggering another E-stop. The issue seems to improve or be eliminated if I reduce the depth of cut and/or slow the feed rate down. Cutting polycarbonate I had to take it down to 1/16" depth of cut with 10ipm feedrate.
My theory: since it has only really shown up in interpolations when X, Y, and A slave are all engaged the issue is with the power supply not providing enough current to the stepper motors? I am learning as I go along so I am not even sure if the steppers have a feedback option where they will cause UCCNC to fault out because the motor cant draw enough current. Or maybe the steppers are drawing more current pulling it away from the G540 so when the controller sees the drop in current it faults out. This would explain why reducing feedrate/depth of cut would improve the issue because you are not having to put as much power into the steppers to get it to move.
Please tell me if I am totally off base or if there is another reason why I could be getting these ghost e-stops.