Stepper motor help...STM5776

[john swift]

is the same motor used on the X axis ?

if it is, I would try swapping motors to see if the fault goes with the motor or stays with the stepper driver

what is the supply voltage powering the DM556 ?

using the rule of thumb from Geckodrives web site

ideal supply voltage = the square root of the motor inductance in mH x 32

with a 45V supply I would look for a motor with an inductance of 2.2mH
(you may find the nearest you can find is about 2.8mH )
and going by the label motor current = 4.2A

the NEMA motor sizes relate to the physical imperial dimensions
so a NEMA 17 will be 1.7" square and a NEMA 34 will be 3.4" square

John