# Z heights changes during a carve

**URL:** <https://forum.onefinitycnc.com/t/z-heights-changes-during-a-carve/25955>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [March 15, 2024, 8:31pm UTC](https://forum.onefinitycnc.com/t/z-heights-changes-during-a-carve/25955 "2024-03-15T20:31:27Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [March 15, 2024, 8:49pm UTC](https://forum.onefinitycnc.com/t/z-heights-changes-during-a-carve/25955/2 "2024-03-15T20:49:58Z")

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Hey John,

this sounds like the [z plunge issue](https://forum.onefinitycnc.com/search?q=z%20plunge%20issue). Maybe → [this](https://forum.onefinitycnc.com/t/x50-z-axis-randomly-plunges-into-piece/18727/2) and → [this](https://forum.onefinitycnc.com/t/my-x35-woodworker-seems-to-have-developed-a-mind-of-its-own/19306/2) will help you.

There exist many issues around the Z axis not doing what it should. See [Z plunge](https://forum.onefinitycnc.com/search?q=z%20plunge) issue. Some are caused by bugs in newer firmware, some by cable breaks in the ‘curly’ Z stepper cable, some are caused by [EMI](https://en.wikipedia.org/wiki/Electromagnetic_interference) due to the use of non-shielded stepper cables on the machine, and some by bit slipping due to the mediocre ability of the hand trim router’s collet to hold bits (in comparison to [ER collets](https://forum.onefinitycnc.com/t/makita-burned-up/23846/14) on [spindles](https://forum.onefinitycnc.com/t/spindles-lingering-questions/8643/6) and [43 mm “Euro” milling motors](https://forum.onefinitycnc.com/t/introducing-the-new-onefinity-elite-series-powered-by-masso/16706/115#best-milling-motor-solution-for-hobbyists-and-semiprofessionals-1)).

#### See also

- [Z Axis Moving Unexpectedly (Cutting too shallow or too deep)](https://forum.onefinitycnc.com/t/z-axis-moving-unexpectedly-cutting-too-shallow-or-too-deep/14829)
- [Troubleshooting: Rail is getting hung, stuck, grinding, or moving in opposite direction (x35/x50 machines)](https://forum.onefinitycnc.com/t/troubleshooting-rail-is-getting-hung-stuck-grinding-or-moving-in-opposite-direction-x35-x50-machines/10826)

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