Collet nut cracked mid-run on that big aerospace job today

Was feeding through a 3/8 end mill at 12K RPM and heard this nasty ping... looked down and the nut had a hairline fracture from who knows when. Had to scrap two parts before I caught it. Anybody else check their collets before pushing start?

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1 Comment

cole_mitchell88h ago

Read a post on another forum where a guy said he always taps his collet nut with a wrench before loading a tool, just to hear if the sound changes. Supposedly a cracked one rings different than a solid one, kind of like a cracked bell. Been doing that myself after a similar issue, seems to catch the bad ones before they cause trouble.