# Has anyone replaced their Z axis assembly for greater travel?

**URL:** <https://forum.onefinitycnc.com/t/has-anyone-replaced-their-z-axis-assembly-for-greater-travel/9028>\
**Category:** Original/PRO Series (Buildbotics) (Gen 1)\
**Created:** [November 19, 2021, 5:11pm UTC](https://forum.onefinitycnc.com/t/has-anyone-replaced-their-z-axis-assembly-for-greater-travel/9028 "2021-11-19T17:11:04Z")\
**Posts on this page:** 1\
**Showing post:** 8

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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:** [November 20, 2021, 9:30pm UTC](https://forum.onefinitycnc.com/t/has-anyone-replaced-their-z-axis-assembly-for-greater-travel/9028/8 "2021-11-20T21:30:53Z")

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Hey Bob, hey Peter @Nightowl,

> [@Bob\_D](#):
>
> As the spindle/router is zipping back and forth there is a lot of lateral force applied to the mounts. If you double the height, you decrease the stability of the mounting system. The material used to create the risers is not the issue. It is the longer moment arm created from the attachment point at the base to the point where the force is applied at the X rail height.

you are right, Riser blocks seem something easy to add but most people underestimate the increasing leverage force. Nonetheless [they are offered](https://forum.onefinitycnc.com/t/onefinity-riser-blocks/7641/1).

> [@Bob\_D](#):
>
> Using only two riser blocks under the ends of the X rail would probably be a more stable configuration than four riser blocks under the Y rails.

But the the increased leverage force acts on the two X rails then via the Z gantry. I would avoid that too.

I plan a table where the room where usually the wasteboard takes place remains empty, with the possibility to mount different wasteboards “floating” when necessary and more room for larger workpieces or a large 4th Rotary Axis.

But when thinking of such things one must be aware how strong and stiff such a U-shaped base has to be. You will either have to use thick dampened beech timber to construct such a thing and use triangular reinforcements or, as I plan it, weld it from steel profiles.

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