https://youtu.be/HUlREEm-d-Y?si=RPFm5ZfoXLS4U4zm
>The medical drill bit size: 8.4mm diameter and 265mm long; 0.1mm straightness is required
Apparently it uses lasers to measure runout, calculates exactly where to hit it, with how much force, recomputes accounting for springback, until the runout tolerance is achieved (0.1mm in this case).
I'm impressed. I wonder if my chiropractor could adopt this technology? 
Straightening a bent drill bit
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