# What is the point/How Important is that circle in the Touch Probe?

**URL:** <https://forum.onefinitycnc.com/t/what-is-the-point-how-important-is-that-circle-in-the-touch-probe/11292>\
**Category:** Touch Probe\
**Created:** [February 18, 2022, 1:03pm UTC](https://forum.onefinitycnc.com/t/what-is-the-point-how-important-is-that-circle-in-the-touch-probe/11292 "2022-02-18T13:03:59Z")\
**Posts on this page:** 1\
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**Author:** ![Dustoff00](https://avatars.discourse-cdn.com/v4/letter/d/34f0e0/32.png) [@Dustoff00](https://forum.onefinitycnc.com/u/Dustoff00)\
**Post date:** [February 22, 2022, 8:24pm UTC](https://forum.onefinitycnc.com/t/what-is-the-point-how-important-is-that-circle-in-the-touch-probe/11292/5 "2022-02-22T20:24:57Z")

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When the spindle is properly grounded, i.e. pin 4 to ground and the chassis of the spindle is grounded to the the internal pin 4, then you do not need the magnet for the touch probe. The chassis of the Makita router, by itself is not grounded, it only has the 2 prongs(at least the US version).

Here is a good/short thread/explanation… [Touch probe/Spindle - What did I do wrong?](https://forum.onefinitycnc.com/t/touch-probe-spindle-what-did-i-do-wrong/11391)

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