Gantry squaring issue: upper Y truck is constantly 1cm shorter than lower Y truck

Mostly Printed CNC - MPCNC Troubleshooting
1

I ran into wobbly gantry issues on my MPCNC. I ended up having to redo the core. I squared the trucks without incident but after I put the core back on, the upper Y truck is always anywhere from 9-12mm closer to the top right corner than the lower Y truck is to the lower right corner.

I’ve redone the squaring without the core and got everything lined up again, but as soon as I put the core back on and try to square it, the issue comes back. Even when I tighten the core clamp closest to me as far as it will go, the gap still exists.

This image below is just the latest measurement after redoing the truck squaring. I’ve been doing nothing but squaring for maybe 10ish hours over 3 days and I keep running into this difference - can I get some concrete steps to do in order to fix?

PXL_20251219_222537169~2
PXL_20251219_222537169~21920×2560 601 KB

2

Get as close as possible, the rest will be done squaring the machine automatically or by pushing it against hardstops when powering up. :slightly_smiling_face:

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3

So it doesn’t really matter if no combination of tension on the core clamps or trucks changes this 9ish-12ish mm gap?

Not trying to sound like a wise guy here, but isn’t this some kind of issue somewhere?

4

No, it won’t be. :slightly_smiling_face:

5

I use hard stops :raised_hand: :zany_face: never have problems w>th squaring just user error

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