Hello everyone,

Look at the pics to see the problem...

The first is surfacing 20lb foam with a 1/4" cutter (70% overlap) in the y axis direction.
You can see the difference in height every time it changes direction.
About 10 thou ???

The second pic is a 1/8" ballnose with a 30 thou pass in hdp foam.
Again, same problem.
Its like the z axis is somehow changing height when the machine changes direction ?

I would post the gcode but it shows static height.
Mach 3 wouldn't do that I dont think.
10HP high frequency spindle runs smooth.
Rhinocam cut speed is 80ipm.
30 for approach and engage.

Any thoughts ?