How to Read a Worn Gun Drill: Visual Failure Analysis from the Shop Floor
How to Read a Worn Gun Drill: Visual Failure Analysis from the Shop Floor Every gun drill that comes back to the regrind station tells a story. The wear pattern is the drill’s way of telling you what went wrong down in the hole — coolant pressure, chip packing, wrong feed, you name it. I have looked at thousands of pulled drills over the years, and almost every failure mode leaves a signature you can learn to read in about thirty seconds under magnification. ...