I have a stock K40 laser engraver.
Y axis stepper motor has failed.
With no power, i should be able to move axis up and down freely.
It seems that it is stuck.
Can you suggest a replacement part for stepper motors.
I want to replace both stepper motors.
I would make sure that itâs still the same if you disconnect the wires from the stepper motor. If it spins freely when you disconnect the wires, the stepper driver chip on the control board is dead; if it is still stuck with the wires disconnected, itâs a physical problem such as a piece of metal stuck in the motor bearings.
Donâs post shows what you are looking for. NEMA17 motors are everywhere these days because of 3D printers. He has X and Y specs, including size and electrical specs. Make sure that the body length isnât longer than what you are replacing; shorter is generally OK. Youâll want inductance to at least be similar, current capacity to be no less, donât worry about voltage rating per se because it doesnât matter in this application really (though itâs related to inductance).
The only meaningful physical spec variation Iâve seen is some NEMA17-advertised motors I have seen have #4-40 screw threads instead of M3. That seems less common these days, probably in part thanks to 3D printers.
Make sure the motor is 0.9 degree per step. That is what the K40 uses, not the standard 1.8 degree per step motors that 3D printers use. The stock board is setup to use 0.9 degrees per step in the firmware.
I missed that, thanks. @Dimitris_Galaktiou, note that 0.9â° per step can also be listed as 400 steps/rev. Some 3d printers use 400 steps/rev for some stepper motors, but itâs definitely a niche.
Exactly where is a best source for you depends on where you live, I guess. Shipping across the ocean is taking a long time right now due to COVID-19.