# Probe Z on steel table, vice & part

**URL:** <https://forum.onefinitycnc.com/t/probe-z-on-steel-table-vice-part/22060>\
**Category:** Spindle/VFD (Aftermarket/Unsupported)\
**Created:** [August 25, 2023, 1:45am UTC](https://forum.onefinitycnc.com/t/probe-z-on-steel-table-vice-part/22060 "2023-08-25T01:45:40Z")\
**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:** [August 25, 2023, 2:05am UTC](https://forum.onefinitycnc.com/t/probe-z-on-steel-table-vice-part/22060/2 "2023-08-25T02:05:27Z")

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Hey AntMan,

I assume you are talking of Buildbotics.com-derived Onefinity CNC Controller.

Yes it’s true, it has already been covered and you would find it in the forum with the search function:

1. Because your spindle is grounded, then you need only the wire leading to the [3-Axis Touch Plate](https://www.onefinitycnc.com/product-page/onefinity-3-axis-touch-probe). Unlike when using the router, you now do not need the magnet end of the touch plate anymore. **But in most cases the cable is wired the wrong way around.** [See here for details](https://forum.onefinitycnc.com/t/replacement-curly-cable/14837/7).

2. Be absolutely sure that your spindle is grounded through the fourth ([PE](https://en.wikipedia.org/wiki/Protective_earth)) wire of its motor cable, otherwise you have a strong safety problem. Although the machine chassis has to be grounded, including all moving parts, **the spindle should NEVER be grounded through the chassis!** The only correct way to ground the spindle is through the PE wire in its motor cable that is connected to VFD ground (⏚) (usually in [its grounded control cabinet](https://forum.onefinitycnc.com/t/hey-is-this-your-vfd-enclosure/10130/3)), and from there it is connected to ground in the wall outlet or wall box.

✅ IMPORTANT NOTE: I would strongly advise against making your own spindle cable without reading this document:

> [@What is needed to wire up 2.2kw 220v Spindle and VFD?](https://forum.onefinitycnc.com/t/what-is-needed-to-wire-up-2-2kw-220v-spindle-and-vfd/11123/27):
>
> - [Begin with the End in Mind — Proper VFD Cable Termination (PDF)](https://www.southwire.com/medias/sys_master/related-pdfs/related-pdfs/he5/h8e/8868033429534/Begin-with-the-End-in-Mind-Proper-VFD-Cable-Termination.pdf)

#### See here for details:

- [The Spindle cable](https://forum.onefinitycnc.com/t/trusted-shielded-16-3-and-16-4-suppliers/12251/17)
- [How to ground your machine](https://forum.onefinitycnc.com/t/proper-grounding-how-have-you-grounded-your-frame/12331/22)
  - [Material and Tools needed to ground your frame](https://forum.onefinitycnc.com/t/where-to-get-spindle-cable/20099/8)

- [Which Spindle Cable](https://forum.onefinitycnc.com/t/where-to-get-spindle-cable/20099) _(DIY vs. ready-to-use)_

Welcome to the forum!

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