# Uneven Z-axis tramming along X-axis, help needed

**URL:** <https://community.inventables.com/t/uneven-z-axis-tramming-along-x-axis-help-needed/105796>\
**Category:** X-Carve\
**Created:** [December 1, 2020, 4:58am UTC](https://community.inventables.com/t/uneven-z-axis-tramming-along-x-axis-help-needed/105796 "2020-12-01T04:58:08Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![JinKim](https://avatars.discourse-cdn.com/v4/letter/j/9de053/32.png) [@JinKim](https://community.inventables.com/u/JinKim)\
**Post date:** [December 1, 2020, 4:58am UTC](https://community.inventables.com/t/uneven-z-axis-tramming-along-x-axis-help-needed/105796/1 "2020-12-01T04:58:08Z")

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Hi,

I read through tramming posting but couldn’t find my case, so posting for help.  
My router is not perpendicular with respect to Y-axis which seems require shim according to what I read here and there.

Problem is, if I move router to all the way right (X max), router is perpendicular but if I move router to all the way left (X zero), there is big gap on square on the bottom, i.e. it’s tilted towards to Y zero. Of course, this gap narrows as router moves X+ and disappear at X max.  
And this is kept along Y movement, i.e., router is perpendicular at both Y0 and Ymax when X max but has gross the same gap at both Y0 and Ymax with X 0.

The only explanation I can imagine is there is twist in X bar but I can’t imagine how and if so, how to fix.  
The machine is almost disassembled and reassembled on flat (cast iron table saw top with \<0.005" flat) to make sure frame is not twisted. I matched diagonal length to make sure frame is square.  
Would anyone can point me where to look to fix this issue?  
Thank you very much in advance for all advice!

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**Author:** ![MarkA.Bachman](https://avatars.discourse-cdn.com/v4/letter/m/bb73d2/32.png) [@MarkA.Bachman](https://community.inventables.com/u/MarkA.Bachman)\
**Post date:** [December 2, 2020, 1:23am UTC](https://community.inventables.com/t/uneven-z-axis-tramming-along-x-axis-help-needed/105796/2 "2020-12-02T01:23:15Z")

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Are you sure there is not a twist in your base/waste board?  
If you have a digital level use that to check both at each side.

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**Author:** ![JinKim](https://avatars.discourse-cdn.com/v4/letter/j/9de053/32.png) [@JinKim](https://community.inventables.com/u/JinKim)\
**Post date:** [December 2, 2020, 5:14am UTC](https://community.inventables.com/t/uneven-z-axis-tramming-along-x-axis-help-needed/105796/3 "2020-12-02T05:14:51Z")

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Thanks for the reply.  
That was the first thing I suspected when I found this issue.  
So, I moved machine to my table saw’s cast iron top which I manage it flat to 0.005" and found one side was rocking if I push. So I removed waste board, loosened bots, clamped down base to table saw top, and tighten bolts. Now all rockings are gone and stay flat but the issue is still there.

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**Author:** ![MarkA.Bachman](https://avatars.discourse-cdn.com/v4/letter/m/bb73d2/32.png) [@MarkA.Bachman](https://community.inventables.com/u/MarkA.Bachman)\
**Post date:** [December 3, 2020, 1:07am UTC](https://community.inventables.com/t/uneven-z-axis-tramming-along-x-axis-help-needed/105796/4 "2020-12-03T01:07:13Z")

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Ok what about a digital level?  
I would really be surprised if the square extrusion had a twist in it!

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<div class="post-metadata">

**Author:** ![JinKim](https://avatars.discourse-cdn.com/v4/letter/j/9de053/32.png) [@JinKim](https://community.inventables.com/u/JinKim)\
**Post date:** [March 7, 2021, 2:35am UTC](https://community.inventables.com/t/uneven-z-axis-tramming-along-x-axis-help-needed/105796/5 "2021-03-07T02:35:22Z")

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For the record, this issue is resolved.  
Giovanna suggested to disassemble maker slide and put on flat surface to see whether there is twist.  
It is INDEED twisted. I can’t imagine how that thick extrusion is twisted but it is. I got this machine as second hand and there was a lot of abuse sign on it. So there is good possibility.  
Bought new maker slide with chrome marking and replaced old one. And issue is all gone.  
There is some Z-tilt left but this is addressed with shim behind of router attachment as well known fix.  
Now it trams X-Y axis with very light ridge only can tell with finger touch. I may be able to make this gone with more shim but it’s already more than enough.  
Finally working.