# Z Access Servo shift / oldham coupler from old NEMA 34 motor question

**URL:** <https://forum.avidcnc.com/t/z-access-servo-shift-oldham-coupler-from-old-nema-34-motor-question/6132>\
**Category:** Build Logs\
**Created:** [May 12, 2026, 8:09pm UTC](https://forum.avidcnc.com/t/z-access-servo-shift-oldham-coupler-from-old-nema-34-motor-question/6132 "2026-05-12T20:09:54Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![nateD](https://avatars.discourse-cdn.com/v4/letter/n/ce7236/32.png) [@nateD](https://forum.avidcnc.com/u/nateD)\
**Post date:** [May 12, 2026, 8:09pm UTC](https://forum.avidcnc.com/t/z-access-servo-shift-oldham-coupler-from-old-nema-34-motor-question/6132/1 "2026-05-12T20:09:54Z")

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I was told this old oldham coupler would be used for the new Z access servo motors, but it doesn’t seem to want to fit. I do have the screw completely loose on it, but I don’t want to force it on there. I assume it should fit right? I haven’t opened up all my stuff yet for some of the parts as I’m not ready for that yet so I want to keep everything together, but I did open up the stuff for the other motors and got those all built out and didn’t see any new oldham coupler in there. Just curious if I should start soft hammering it…or if anyone else had this issue?

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**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\
**Post date:** [May 13, 2026, 5:18pm UTC](https://forum.avidcnc.com/t/z-access-servo-shift-oldham-coupler-from-old-nema-34-motor-question/6132/2 "2026-05-13T17:18:55Z")

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Can you post some picutres?

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**Author:** ![nateD](https://avatars.discourse-cdn.com/v4/letter/n/ce7236/32.png) [@nateD](https://forum.avidcnc.com/u/nateD)\
**Post date:** [May 13, 2026, 6:46pm UTC](https://forum.avidcnc.com/t/z-access-servo-shift-oldham-coupler-from-old-nema-34-motor-question/6132/3 "2026-05-13T18:46:02Z")

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yup when I go to put on the shaft it doesn’t fit on it. If I put it reverse it will slide down but it’s super tight after that first open part. I tried calling you guys a few times in the last couple weeks and it just rings and goes to voicemail. You guys must be busy!!

 ![oldham coupler issue](https://canada1.discourse-cdn.com/flex027/uploads/avidcnc/original/2X/d/d7859b8f8c73f3b6cfa96f63a8b6f7be921532da.jpeg)

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**Author:** ![Eric](https://yyz1.discourse-cdn.com/flex027/user_avatar/forum.avidcnc.com/eric/32/3220_2.png) [@Eric](https://forum.avidcnc.com/u/Eric)\
**Post date:** [May 13, 2026, 7:45pm UTC](https://forum.avidcnc.com/t/z-access-servo-shift-oldham-coupler-from-old-nema-34-motor-question/6132/4 "2026-05-13T19:45:24Z")

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If it goes in one way and not the other there might be a slight burr on the bore. You could feel for that and file it down.

to get in touch with support best thing to do is make a ticket on the contact form up top… and yes we’ve been busy getting ATC sorted out!

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**Author:** ![nateD](https://avatars.discourse-cdn.com/v4/letter/n/ce7236/32.png) [@nateD](https://forum.avidcnc.com/u/nateD)\
**Post date:** [May 13, 2026, 10:05pm UTC](https://forum.avidcnc.com/t/z-access-servo-shift-oldham-coupler-from-old-nema-34-motor-question/6132/5 "2026-05-13T22:05:22Z")

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Thanks Eric! Your the best buddy!