# After changing bits and probing Z, the Z is way off? **URL:** \ **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:** 14
**Author:** ![Cjd1](https://avatars.discourse-cdn.com/v4/letter/c/eada6e/32.png) [@Cjd1](https://forum.onefinitycnc.com/u/Cjd1)\ **Post date:** [January 25, 2022, 12:16am UTC](https://forum.onefinitycnc.com/t/after-changing-bits-and-probing-z-the-z-is-way-off/10452/14 "2022-01-25T00:16:55Z")
Z Axis Changes During Cut - Onefinity CNC Machines - Onefinity CNC Forum > [@Z Axis Changes During Cut](https://forum.onefinitycnc.com/t/z-axis-changes-during-cut/2266): > > The following has happened with gcode from both Fusion 360 and Aspire. While running gcode, the z zero is reset to a much lower setting without any user intervention. I’m talking a half an inch lower. I have cut deeply into my spoil board on a few occasions. Luckily I missed the t-track! I had assumed this was due to some user error (it may still be), but now I’m not so sure. Tonight, I was cutting the Marvel Aztec calendar. I loaded the gcode, zeroed the x y and z, and began cutting. In less t… --- _[View the full topic](https://forum.onefinitycnc.com/t/after-changing-bits-and-probing-z-the-z-is-way-off/10452)._