CNC down need new stepper motor

[Kenneth Thomas]

I am having an issue with a stepper motor on machine that I bought used 6 years ago. The company that makes it is out of business and I need to find a replacement. Most new NEMA 34 motors are using a 1/2" shaft and this one has a 3/8" shaft. I do not mind a bigger motor as I have plenty of space and have updated Gecko drivers but need to work with the pulleys and belt size I have. Here is the info I have.

Current Motor
MCG IH34110
Does not need shaft on both sides as only one is used.

Pully
3/8" ID with 7/8" OD .080 pitch


Any recommendations on motors and or pulley combinations would be great.

[David Buchhauser]

I think the NEMA 34 with 1/2" shaft will be fine. You could either machine out your pulley ID hole to 1/2" (if possible) or purchase a replacement pulley with 1/2" ID x 7/8" OD x 0.080 pitch - if you can find one. Otherwise you can use a slightly larger OD pulley and recalibrate your software with the correct turns ratio for the larger diameter pulley.
David

[Matt Schrum]

A quick Google search brought up the link below, so I am sure there are more out there:

http://cncbasis.com/stepper-motor-ne...-single-shaft/

As David said, if it's easier or cheaper to get a NEMA34 with 1/2" shaft, then there are plenty of replacement gears available (usually, my stuff is only NEMA 23 and there are a ton) and it may make the process easier in the future if you have to swap out a stepper again.

[Kenneth Thomas]

Thanks for the reply. I finally found a motor on Amazon that will be in stock in a week and a 1/2" pulley. The biggest issue was the length as it would interfere with the X axis and decrease it.

[Andrew Werby]

Did replacing the motor fix your problem? People often blame their steppers, but they hardly ever go bad (unless you open them up to check them out). Or was this a gearmotor? Then all bets are off...