Ok so i found a little time to do a leveling test at the new home of the machine.

I have setup the laser pointing along the long axis crosshair at about the middle of the gantry.

My flexing concrete floor is making things much harder then i expected while measuring adjusting and measuring again.
Walking around influences measurements.

My concrete floor is cast on sand, dont have any more information about it now.


In general all 4 x,y corners are in the same plane now .. within about 5 um.
Trying to get it any better seems silly compared to what walking around does to the measurements.

In the end my goal is checking the machine for general flatness and setting it up level

Both the long axis now look like they are within 10um deviation over 1800 mm of travel, this is far better than i expected.
Thank you epoxy.

Having the laser setup on a solid object other than the cnc table frame is a must.
When connected to the frame things get complicated quickly when 1 corner is adjusted everything changes.

Like mentioned here before, now we can visualize micrometers everything looks like made of jelly.


The gantry though looks like it has a deviation of about 50 um upward in the middle. This is a bit weird to me, the epoxy proces was done the same way and the axis is much shorter. There was no welding after epoxy.


I am going to re test this axis by moving the laser 90deg and in line with the gantry.
This should cancel out some optics quality issues. I guess the projected line could be non straight.

Thank you guys, for this cool solution.


Grtz Bert.



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