Hi, I am almost finished with a 500x500 build. ACME screw and Nema 23 motors.
I am unto the 'calibrate' stage of the instructions, testing direction of the stepper motors.
X and Y work as expected, however Z is skipping steps or binding (going in correct direction).
I have yet to set the homing switches and voltage but I have the pots at 12 o'clock for all 3 axis for now.
I have read the forums and have done the following:
* Checked/adjusted Z belt tension
* Ran the delrin nut up and down with a power drill (now smoother)
* Switched the Z motor wires to X terminal block mounted to carriage to make sure it wasn't a problem with gshield connections on the Z controller
* Loosed off the retaining nut on the top of the ACME rod.
I do not detect any major resistance when I turn the ACME rod manually with a spanner, motor spins freely when not connected to belt.
I will check the screws holding the rod bearing are not too tight tonight (although, if it moves OK by hand I doubt it is a problem)
What is an ideal voltage pot position for the Z? Should I turn it up, or do I risk overheating?
I guess the Z needs more voltage due to resistance in the screw drive compared to the other axis, but how much is too much?