To visualise what’s happening here I suggest you get CAMotics, load in the nc script & it will simulate what will happen on the CNC.
CAMotics
Had a look at your code and yes it tells the CNC to head to the top right diagonally to start then as it moves the initial cut it gradually lowers to -4mm, goes around, when it gets to the starting point it lowers to -8mm then on the 3rd pass it lowers to -12mm
What program are you using to generate the .nc code? Can you turn on comments when generating? If you are using KrabzCAM you can set the start position with “e” command.
I wouldn’t raise the Z axis as high, you have a total movement of 22mm from top to full depth of cut, max clearance you need would 4 or even 2mm.
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Thanks for taking a look Ian , sorry its taken me a short while to reply, roof leaked where i was hopijng to situate the cnc / frame . yep, i’m usning KrabzCAM so i’ll try to make the changes you’e suggested, still getting to know the software at the moment 