Carbide Thread Mill Edge Chipping in Hardened Steel: Causes and Fixes
A machining center cutting automotive stamping dies was running D2 tool steel inserts hardened to HRC 58. The spindle speed and feed rate were backed down to 80% of tool catalog specs, and machine rigidity was solid. Yet, by the fourth M6×1.0 blind hole, the operator pulled the tool and spotted micro-fractures along the lead
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