A chamfer mill deburrs the top of a hole after tapping. On some holes it kisses the first thread and the gauge is tight. The chamfer size is 0.3 mm. The hole is a blind tapped hole modeled without the thread.
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Model the thread or at least a thread relief, and keep the chamfer tool above the first full crest. A chamfer path aimed at a plain hole diameter will happily cut the thread you just made.
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Deburr with a spring pass that is shallower, or break the edge before tapping if the process allows. After tapping, the chamfer tool should not enter the pitch diameter.
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Gauge after the chamfer, not before. The operation that fails the thread is the last one that touched it.
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