Thread Milling Hardened Steel: A Practical Guide to HRC60–HRC65 Thread Milling
A mold-making client once came to us with a batch of die components heat-treated to roughly HRC62. The first few holes threaded cleanly, but dimensional drift quickly followed. Burrs formed along the hole entries, and inspection revealed micro-chipping on the tool teeth. The shop had not altered their program or setup, but their cutting conditions
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