Skip Z Move Test for 1st Circle -- The skip Z-test option only applies for APT programs. For helical motion, you would drive a circle (GOFWD) at a constant Z-part surface and GPost will generate a new Z-value. Subsequent circle motion may fail the test for Z-change and output G01 linear blocks instead of G02/03 codes. To avoid this, check this option. (Intcom 2717)