Micro Thread Milling Strategy for HRC65 Hardened Steel
Last month, we helped a German contract manufacturer troubleshoot a high-stakes job. The workpiece was Böhler M390 powder-metallurgy steel, heat-treated to an actual hardness of HRC 64–65. They needed to cut 48 blind-hole M1.6×0.35 threads at a challenging 2.8D depth-to-diameter ratio. Their process engineer broke four consecutive cutters at the neck transition and the first
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