My sizes are out

[Desertboy]

Have you tried with a different vernier caliper or always the same one?

Always the same one but you can see a mm on a ruler which I also tried, the bit is a 1/2" trend router bit, and it's in a 1/2" collet so I think my calipers aren't the issue here.

The pocket even using measuring tape I can see are 1mm undersized.

BUT this gap is meant to be 100cm so the only thing I can think off is the controller is offsetting the tool.




Thinking I might need to connect the X, Y & Z to a breakout board and do a test cut from linuxcnc super slow to see if that shows the same size issue.