How to Troubleshoot Thread Mill Vibration in Hardened Steel
A precision injection mold shop in Ohio called us with an urgent problem: machining M6×1.0 threads into AISI H13 inserts hardened to HRC 58–60. Mid-cycle, the spindle began emitting a piercing screech. When the operators stopped the machine, they found wavy micro-spalling across the thread flanks. Worse, the No-Go gauge slipped right in, and tool
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