In your second example:

2) Without:
(OP3_COUNTERBORE_6MM_0P5_300_NOG28)
(0.5MM PITCH)
(T1 D=6. CR=0. - ZMIN=-15. - FLAT END MILL)
G90 G94 G91.1 G40 G49 G17
G21

(BORE1)


I am worried that G91.1 is still active (Incremental Arc Mode but some controllers may not process the .1 suffix correctly and leave you in relative mode, as you no longer have the G90 as in the first example.

Will