Tweakie,
I agree it's not a Mach problem.
Did a quick try of the posted WOODWAVY SECTION 1A.dxf and generated
a profile code for the complete dxf from Cambam and no arc problems here.
See attached screen shot QUICK TRY RICH.
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Anders,
Suggest you try generating code for just a small part of dxf
in Cambam.That makes it easier to look into what the problem may be.
ie; see SMALL PART OF DXF pic attached as an example.
The code for that pic is attached....TEST3 RICH.
It is just the a small part of your original nc file and
just added line numbers and commented out the problematic lines
280, 290, 310, 320.Note that there is no problem with most of the code.
If the g2 or g3 coding is not correct you can get crop circles etc.
and that can be due to number of things.
You can compare how it's drawn and how Cambam interprets each arc or line
if you have the time and want to investiagte. Cambam provides info on each
arc and line of the drawing.
Suggest you quickly generate code for a profile (with and with out offsets) and engrave and see how it goes.
Take Care,
RICH