# Bearing bolts on x axis

**URL:** <https://forum.onefinitycnc.com/t/bearing-bolts-on-x-axis/8678>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [November 3, 2021, 4:34pm UTC](https://forum.onefinitycnc.com/t/bearing-bolts-on-x-axis/8678 "2021-11-03T16:34:26Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![jnordyke](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/jnordyke/32/1881_2.png) [@jnordyke](https://forum.onefinitycnc.com/u/jnordyke)\
**Post date:** [November 3, 2021, 4:34pm UTC](https://forum.onefinitycnc.com/t/bearing-bolts-on-x-axis/8678/1 "2021-11-03T16:34:26Z")

</div>

Just ran through maintenance on my machine as per the video instructions from Onefinity. Near the end of the process, we are to tighten with a 2.5mm wrench the inside and outside bolts for the rail bearings. The video only shows/mentions the Y axis, but the X axis bearings have - at least on the back side - the same 2.5mm bolts. However, the corresponding “outer” bolts (if they are there) are covered/concealed by the Z gantry assembly. Should one completely remove the Z gantry to get at those bolts??

---

<div class="post-metadata">

**Author:** ![Machinist](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/machinist/32/36465_2.png) [@Machinist](https://forum.onefinitycnc.com/u/Machinist)\
**Post date:** [November 3, 2021, 5:18pm UTC](https://forum.onefinitycnc.com/t/bearing-bolts-on-x-axis/8678/2 "2021-11-03T17:18:53Z")

</div>

John, personally I would not remove the z axis assembly to check these (thereby having to retram), unless there was evidence that they needed tightening. Seems that snugging them from one side should suffice. Onefinity may offer a different thought on that though.