reworking bore drilled off position
Problem Description A bore drilled off position is a costly problem in deep hole drilling. I’ve had parts where the bore exit was 0.5 mm off location on a 20 mm diameter hole through 300 mm of 4140 steel. The part was otherwise perfectly machined, but the positional error made it scrap unless I could rework it. In deep hole drilling, bore position errors are especially painful because so much machining time has already been invested when the error is discovered. ...