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The countersinking of large holes is best achieved using a chamfer bit and the M38 start code override as detailed in the previous topic. The chamfer bit must be correctly set up in TouchCut with the geometry of the bit entered as accurately as possible. The M38 chamfer macro will interpolate around the axis of the internal hole until the countersink is achieved according to the D, C and E codes. Best performance is achieved by using a diameter of bit that will fit inside the internal hole. This is compulsory when using the E2 and E3 commands for an underside chamfer.

This macro is based around the tool rapiding down to the plate then interpolating a path. If the tool is large enough not to require interpolation it will rapid into the plate! In this situation you should set it up as a point tool in TouchCut (either Drill or Spot Drill) and limit the drilling depth.