Why Is the Thread Surface Finish Poor After Thread Milling HRC65 Steel?
While helping a German tooling customer troubleshoot slider inserts hardened to HRC63–65, we ran into an all-too-familiar headache. The batch of M6 internal threads passed every coordinate measuring machine (CMM) check, optical inspection, and go/no-go gauge test. However, the thread flanks consistently missed the target Ra 0.4 specification. Under a microscope, the thread walls showed
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