# Advice On Spindle Height In Mount

**URL:** <https://forum.pwncnc.com/t/advice-on-spindle-height-in-mount/2661>\
**Category:** General\
**Created:** [February 10, 2025, 1:56am UTC](https://forum.pwncnc.com/t/advice-on-spindle-height-in-mount/2661 "2025-02-10T01:56:10Z")\
**Posts on this page:** 2\
**Page:** 1

<div class="post-metadata">

**Author:** ![Eriz](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.pwncnc.com/eriz/32/540_2.png) [@Eriz](https://forum.pwncnc.com/u/Eriz)\
**Post date:** [February 10, 2025, 1:56am UTC](https://forum.pwncnc.com/t/advice-on-spindle-height-in-mount/2661/1 "2025-02-10T01:56:10Z")

</div>

I’m setting up my PwnCNC ATC on a Onefinity woodworker and I’m trying to decide what the best spindle location in the z-mount will be for me. I appreciate feedback from any experienced CNC users.

**(1) Bit deflection**  
The lower the spindle is in the mount the longer the lever arm. The longer the lever arm the greater the bit deflection due to a given force. For the setup shown (115 mm lever). I measure less than 130 um of deflection. For woodworking this seems acceptable to me.

**(2) Maximize useable area under z-mount / spindle**  
My thinking is that engraving will be the use case where I would want the maximum Z working space. Therefore, if a set the spindle so that my Vee bit is at the bottom of the z-mount when the spindle is fully raised I have maximized my working area. Since the camera was above the Vee bit it appears the bit is lower than it is relative to the Z-mount.

**(3) Useable Z-travel**  
I measured the Z-travel at 161 mm. The distance from the bottom of the z-mount to the bed is 129 mm. To maximize the useable Z-travel I’m thinking I should raise the machine the difference between those two numbers (32 mm).

 ![image](https://canada1.discourse-cdn.com/flex011/uploads/pwncnc/original/1X/c22632e29580a9f29c335ec241ff618eba232ebd.jpeg)

---

<div class="post-metadata">

**Author:** ![Chris](https://yyz1.discourse-cdn.com/flex011/user_avatar/forum.pwncnc.com/chris/32/54_2.png) [@Chris](https://forum.pwncnc.com/u/Chris)\
**Post date:** [February 10, 2025, 4:05am UTC](https://forum.pwncnc.com/t/advice-on-spindle-height-in-mount/2661/2 "2025-02-10T04:05:56Z")

</div>

Have you seen this article? [Spindle Mounting Position](https://support.pwncnc.com/kb/article/433-spindle-mounting-position/)  
Additional considerations include what [Tool Racks](https://support.pwncnc.com/kb/section/88/) you’re using.

I have also found that using the rotary includes further considerations. So its all, what works for you.