My press was going 2400 - recently, I had TWO COBALT bits break trying to get thru a GT receiver. This is insane... I've done at least SIX of these.
I suspect Heat Treating issues - but wanted to find out if any of you have gone down to 1600 RPM for routine receiver drilling?
I suspect Heat Treating issues - but wanted to find out if any of you have gone down to 1600 RPM for routine receiver drilling?