On a blisk with a 3 mm flat tool, the swarf tolerance gate reported 0.0131 mm while an independent check of the written path measured 0.0163 mm; at tolerances of 0.0131 and 0.0132 it gave a false all-clear, and at 0.0182 and up it reported 0.0006 mm. The gate only sampled rulings at poses and mid-moves, 25 points each, so it found or missed the deepest cut by luck.