Had to redo a job after my insert holder slipped, now I check torque every hour

I was running a production batch of Delrin parts for a local shop in Akron on Tuesday and the insert shifted about 0.2mm halfway through, which ruined 14 pieces before I noticed. My new torque wrench was showing correct spec but the holder still moved, so I think the tool block had some chip buildup underneath. Does anyone else re-tighten their holders during long runs, or do you trust the initial setup and just monitor the finish?

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