# Wobble in Z

**URL:** <https://community.inventables.com/t/wobble-in-z/30024>\
**Category:** Troubleshooting\
**Created:** [November 14, 2016, 7:02pm UTC](https://community.inventables.com/t/wobble-in-z/30024 "2016-11-14T19:02:11Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Bricbasher](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/bricbasher/32/84556_2.png) [@Bricbasher](https://community.inventables.com/u/Bricbasher)\
**Post date:** [November 14, 2016, 7:02pm UTC](https://community.inventables.com/t/wobble-in-z/30024/1 "2016-11-14T19:02:11Z")

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I have noticed when my Z is homing that I can visually see the router wobbling back and forth. So far it doesn’t seem to be affecting my carves although I haven’t done any 3d carving yet and I wonder if it would show up there on the carve. Could this be the ACME rod?

I’ve also noticed there is a ton of flex from left to right on the Z when I change a bit. Is that normal? Sometimes I feel like I’m gonna mess something up when the nut on the collet first comes loose. Am I bending the Z axis somewhere each time I do this?

Thanks for the input.

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**Author:** ![AaronMatthews](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/aaronmatthews/32/73728_2.png) [@AaronMatthews](https://community.inventables.com/u/AaronMatthews)\
**Post date:** [November 14, 2016, 7:09pm UTC](https://community.inventables.com/t/wobble-in-z/30024/2 "2016-11-14T19:09:32Z")

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I recommend checking the V wheels on your z Axis.  
On mine the hole for the eccentric nut was actual starting to get gouged and pulled out of shape.

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**Author:** ![anon68752607](https://avatars.discourse-cdn.com/v4/letter/a/6de8d8/32.png) [@anon68752607](https://community.inventables.com/u/anon68752607)\
**Post date:** [November 15, 2016, 10:24am UTC](https://community.inventables.com/t/wobble-in-z/30024/3 "2016-11-15T10:24:28Z")

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i’ve had the same thing and for me it was indeed the acme rod. It seems a LOT of these are shipped bent. Not cool but it is what it is. You will notice a wavy pattern on 3D shapes with a lot of Z travel.

That is why I bought a linear rail Z stage from ebay. It’s also acme but at least it is perfectly straight!

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**Author:** ![JasonHerrman](https://avatars.discourse-cdn.com/v4/letter/j/9d8465/32.png) [@JasonHerrman](https://community.inventables.com/u/JasonHerrman)\
**Post date:** [December 19, 2018, 9:51pm UTC](https://community.inventables.com/t/wobble-in-z/30024/4 "2018-12-19T21:51:19Z")

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Mine does the same thing. How did you solve?

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**Author:** ![Bricbasher](https://yyz1.discourse-cdn.com/flex009/user_avatar/community.inventables.com/bricbasher/32/84556_2.png) [@Bricbasher](https://community.inventables.com/u/Bricbasher)\
**Post date:** [December 19, 2018, 11:14pm UTC](https://community.inventables.com/t/wobble-in-z/30024/5 "2018-12-19T23:14:50Z")

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I eventually got a new z axis that doesn’t wobble at all. 😁