# After changing bits and probing Z, the Z is way off?

**URL:** <https://forum.onefinitycnc.com/t/after-changing-bits-and-probing-z-the-z-is-way-off/10452>\
**Category:** Uncategorized\
**Created:** [January 17, 2022, 7:23pm UTC](https://forum.onefinitycnc.com/t/after-changing-bits-and-probing-z-the-z-is-way-off/10452 "2022-01-17T19:23:26Z")\
**Posts on this page:** 1\
**Showing post:** 18

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**Author:** ![stradibarrius](https://avatars.discourse-cdn.com/v4/letter/s/a6a055/32.png) [@stradibarrius](https://forum.onefinitycnc.com/u/stradibarrius)\
**Post date:** [January 25, 2022, 4:49pm UTC](https://forum.onefinitycnc.com/t/after-changing-bits-and-probing-z-the-z-is-way-off/10452/18 "2022-01-25T16:49:15Z")

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I am having much the same problem but only with my Z. The G code has been checked and it is ok. The problem is not every time I run the program. I thought that the issue had been resolved…then it comes back. I can’t trust it to run correctly. I can’t afford the use wood to be used for a client so I have been using scrap, MDF and even hard foam insulation board. I will b I have done a visual inspection of the Z cable and it “appears” fine. If I can’t somehow get the problem resolved soon I may just sell the machine and try something different. Obviously I’m frustrated. Please, one of you really smart guys help!!!

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