TIL an old toolmaker at the Dayton shop showed me his trick for spotting a spun insert before it wrecks the bore

Val Sullivan · 2026-10-08T05:50:04.704142+00:00

He held a dull insert up to the light and said if the edge glints at all, it's done, and he was right every time. Any of you old timers got a quick check like that you'd pass on to a green operator?

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TIL an old toolmaker at the Dayton shop showed me his trick for spotting a spun insert before it wrecks the bore | CNC Operators - Discusd