# Star knobs and clips, what are they for?

**URL:** <https://forum.onefinitycnc.com/t/star-knobs-and-clips-what-are-they-for/18985>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [February 24, 2023, 1:26am UTC](https://forum.onefinitycnc.com/t/star-knobs-and-clips-what-are-they-for/18985 "2023-02-24T01:26:50Z")\
**Posts on this page:** 1\
**Showing post:** 5

<div class="post-metadata">

**Author:** ![349iq2345](https://avatars.discourse-cdn.com/v4/letter/3/bb73d2/32.png) [@349iq2345](https://forum.onefinitycnc.com/u/349iq2345)\
**Post date:** [February 24, 2023, 6:47pm UTC](https://forum.onefinitycnc.com/t/star-knobs-and-clips-what-are-they-for/18985/5 "2023-02-24T18:47:10Z")

</div>

Hey feenixfire,

that are one of the most important parts of your CNC machine. They allow you to [adjust your machine for coplanarity](https://forum.onefinitycnc.com/t/tramming-the-router/1132/56#machine-could-be-twisted-1), which is extremely important on gantry-style CNC machines, which have two Y axes at a greater distance one from the other. If your machine is not adjusted for coplanarity, it will only produce twisted workpieces.

That is probably also the reason why Onefinity now includes them with the [QCW frame](https://www.onefinitycnc.com/product-page/journeyman-qcw-frame-secure-from-above) (before, you had to order them separately [here](https://www.onefinitycnc.com/product-page/any-surface-leveling-system))

Welcome to the forum!

---

_[View the full topic](https://forum.onefinitycnc.com/t/star-knobs-and-clips-what-are-they-for/18985)._