Spun a tool holder into a 4 inch steel plate in Tulsa and learned why you check torque before the first cut

Jade Murray · 2026-09-22T20:35:03.89957+00:00

I was running a Haas VF-2 at a shop off 11th Street in Tulsa doing a fixture plate job, and about 40 minutes into the cycle I heard a sound I still think about. The CAT40 holder walked out of the spindle because I didn't torque the retention knob right, and it buried a 1/2 inch end mill into the plate at 8,000 rpm before the spindle even knew what happened. The tool, the holder, and the plate were all junk, probably $900 down the drain, and the machine needed a new spindle taper that we couldn't get until Thursday. I shut it down, pulled the program, and walked the whole setup back to the operator who trained me, and he just pointed at the torque wrench on the bench without saying a word. Now I check retention knob torque on every holder before it goes in the carousel, no exceptions. What's your go-to check before the spindle starts turning on a new setup?

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Spun a tool holder into a 4 inch steel plate in Tulsa and learned why you check torque before the first cut | CNC Operators - The Design Community Hub