I salvaged from local school an older CNC (included frame, stepper motors and router). NEMA 34 stepper motors. I added TinyG controller.
Everything works fine except Axis Z.
After switching voltage and feed rate the motor just whines without move the the axis.
I am very new at this and would appreciate some assistance
Please let me know if there is any other information I can provide that would be helpful.
Thank you,
Create a Parameter list ($$ command, copy to a text file) which will answer a few questions. Add that to your dropbox.
When you say Z axis mechanically moves smoothly, do you have a way of manually rotating the Z Stepper ?
One possibility is obviously a bad stepper.
Did you check A and B winding continuity with voltmeter?
So lets say the X stepper is working properly.
You could swap wires from the Z motor and the X motor at tinyG end, just to see if perhaps a driver is not functioning correctly on tinyG.
How many steppers are there, 3 or 4?
I can only see what looks like a stepper at end of gantry.
I have a similar issue. Motor4 (my Z axis) will not move. If I switch the cable to another stepper, that new stepper will not move. I have verified that all four steppers work. I have also verified that all four cables/wires work. I've narrowed it down to that particular motor/axis on the board. I have tried adjusting the pot (carefully), to no avail.
What other thoughts do you have? If we decide it's a bad board, I'm less than an hour away and would appreciate if I could just swap the board out in person vs shipping back and forth.
I figured out my issue. It was the Travel per Revolution ($4tr in my case). It was set to 360000. The others were all 1.2500. Once I changed that, it worked as it should. This value either persisted after I ran the factory default command ($defa=1), meaning the factory default doesn't change that setting or more worrisome, that that is the default value.