If your boring tool still bores between 50 and 100 parts perfectly, then I would think that work hardening is not the real issue. Hardening of the part would degrade the cutting edge with each part, and should (I would think) cause more and more bar deflection with each part, which should be detectable as an error increasingly departing from perfection.
What is the exact hole diameter that the drill produces? The point of this question would be to determine if the drill is perfectly on center when it is working, or whether it would be bearing hard on one side of the spindle centerline.
Does the boring bar have to face the bottom of the hole flat?
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