# How to install the X-50 Stiffy video FAQ

**URL:** <https://forum.onefinitycnc.com/t/how-to-install-the-x-50-stiffy-video-faq/18698>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [February 9, 2023, 3:52pm UTC](https://forum.onefinitycnc.com/t/how-to-install-the-x-50-stiffy-video-faq/18698 "2023-02-09T15:52:37Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![OnefinityCNC](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/onefinitycnc/32/7_2.png) [@OnefinityCNC](https://forum.onefinitycnc.com/u/OnefinityCNC)\
**Post date:** [February 9, 2023, 3:52pm UTC](https://forum.onefinitycnc.com/t/how-to-install-the-x-50-stiffy-video-faq/18698/1 "2023-02-09T15:52:37Z")

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[![](https://us1.discourse-cdn.com/flex022/uploads/onefinitycnc/original/3X/7/c/7c34c55aa44ee74b29d2ce37bc13ed9b797858ef.jpeg "Installing Stiffy Rail on Pro and Elite Series Machines.") ](https://www.youtube.com/watch?v=RCIEqLnvU4Q)

Onefinity X-50 Manual located here: [https://www.onefinitycnc.com/\_files/ugd/f704eb\_c7ad677b9daa478e82cce4ccd0fbc887.pdf](https://www.onefinitycnc.com/_files/ugd/f704eb_c7ad677b9daa478e82cce4ccd0fbc887.pdf)

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**Author:** ![SurfinGump](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/surfingump/32/7699_2.png) [@SurfinGump](https://forum.onefinitycnc.com/u/SurfinGump)\
**Post date:** [February 9, 2023, 4:33pm UTC](https://forum.onefinitycnc.com/t/how-to-install-the-x-50-stiffy-video-faq/18698/2 "2023-02-09T16:33:11Z")

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Apologies if I missed this in a previous post or video, but are the rail tramming bolts actually used to “tram” the rail in the block, or do they exist more for keeping the rail from “wandering under pressure”?

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**Author:** ![OnefinityCNC](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/onefinitycnc/32/7_2.png) [@OnefinityCNC](https://forum.onefinitycnc.com/u/OnefinityCNC)\
**Post date:** [February 9, 2023, 4:46pm UTC](https://forum.onefinitycnc.com/t/how-to-install-the-x-50-stiffy-video-faq/18698/3 "2023-02-09T16:46:35Z")

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They are used for tramming the spindle:

> [@Tramming - Front To Back](https://forum.onefinitycnc.com/t/tramming-front-to-back/8421):
>
> There are a few methods to tram your machine. Loosening some z mount bolts, using 123 blocks, tram arms, folded pieces of tin foil, are all methods that can have acceptable outcomes. Left to right tram is relatively easy to correct. Front to back is a bit harder. There is a unique benefit of buying a Onefinity CNC machine is that every Onefinity machine has built in front to back tramming bolts on the X axis. These allow for tilt of the z slider front to back. There are 4 bolts on each foo…

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**Author:** ![Avbates](https://sea2.discourse-cdn.com/flex022/user_avatar/forum.onefinitycnc.com/avbates/32/31020_2.png) [@Avbates](https://forum.onefinitycnc.com/u/Avbates)\
**Post date:** [February 9, 2023, 5:38pm UTC](https://forum.onefinitycnc.com/t/how-to-install-the-x-50-stiffy-video-faq/18698/4 "2023-02-09T17:38:28Z")

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Why a “stiffy” for the X50? When I purchased my X50 last year I got the impression a stiffy wasn’t needed (like the X35)?

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**Author:** ![SteveWW](https://avatars.discourse-cdn.com/v4/letter/s/dec6dc/32.png) [@SteveWW](https://forum.onefinitycnc.com/u/SteveWW)\
**Post date:** [February 11, 2023, 3:43am UTC](https://forum.onefinitycnc.com/t/how-to-install-the-x-50-stiffy-video-faq/18698/5 "2023-02-11T03:43:09Z")

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Avbates, I’m right there with you.