I have a need for several 0.350" holes 10.5" deep in 4140 rod...
Been looking to buy something close, no joy so far.
I came accross this gundrilling FAQ. It states gundrilling can be done on a CNC lathe like mine.
Anyone have experience with gundrilling on a CNC lathe? I know i can't go with the high pressue oil I've seen on regular gundrills. The above FAQ mentions a spray mist system. I could go with high flow coolant as my CNC lathe is enclosed.
Anyone know how gundrilling was done 100 years ago? Bet the same technique would work today.
Karl