Help needed

[cropwell]

Did the installation 'engineer' check all the alignments? - I would bet not!

You need to check is that there is no twist in the gantry rails*, this will cause all sorts of inaccuracies. First rough check is with a large engineers square. Just eyeball the contact with the rails at each end of travel.

If you clamp a decent size engineer's square to the bed and align it with the X or Y axis using a dial guage, does it give a square reading when jogging along the other axis.

Then, when you have sorted that out, does the Z axis run true vertical wrt the bed. Again using a square and dial guage, testing at both ends of the gantry travel and also in the middle.

* this is also true for all rails. If they are not set up in tram and at 90deg to each other then you will never cut true geometry.