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

X-Carve
1

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!

2

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.

3

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.

4

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

5

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.