I bought the wrong stepper motor, will it still work? (UM2)

[thetastysnail 0]

Hi, hope someone can help with hopefully a simple question.

On my UM2 the y axis stepper motor became notchy and stiff, so i bought a new one to replace it.

to cut a long story short, i managed to get the wrong one.

I bought a sy42sth47-1684a instead of a sy42sth38-1684a the main difference is that it's longer by a few mm so i cant fit the shroud back on. the key specs of degrees per step seem ok, and it's more powerful. so can i do any harm in fitting this as a short term measure. i intend to get the correct motor asap, but i have a big job to finish right now

cheers

Rob

[thetastysnail 0]

I can answer my own question now.

the answer is sort of.

the motor will operate and you can print stuff. I had to leave the cover off, which leads me to think it may get hotter than normal, but the temps seem ok compared to the x axis motor.

also this motor only just clears the build platform.

but the biggest problem what that i kept getting axis slip. It wasn't slipping on the pulleys, i tightened them up a lot. but it would become misaligned on the y axis, usually later on in the print.

I tried lowering the current in the options and this seems to have cured it. So i conclude the bigger motor was causing the stepper driver to overheat and cut out periodically. I will be putting a heatsink on it later and putting the current back up, so we'll see how this helps.

I'm still gonna get the correct motor for it as soon as poss.

[minivipers 25]

where did you get the proper motors? do you have link ?