Thread Mill Core Diameter and Rigidity: How Core Design Affects HRC65 Thread Milling
Last month, we helped a German mold shop set up tooling for hot-work tool steel (1.2379/D2 hardened to HRC 64–65). The shop supervisor slammed three broken M4 thread mills onto the workbench. The thread depth was under 2xD, yet heavy chatter marks covered every thread flank. A thread gage check revealed severe pitch diameter taper
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