In the mill -
4-40 thread, 2.3mm tap drill (so 65%ish thread) No trouble drilling, however, taps explode without fail. We're using dormer/regal taps for Ti, Union Butterfield tap goo and have good rigid tapping on an 8 month old Okuma M560v.
I have an extensive tooling background and my guys aren't stupid but this one's getting the better of us. We have resorted to bringing in threadmills which I think should work fine.
But what the heck? We've tapped hardened steel and super duplex stainless with ease.
In the lathe-
.043" drill. We're spotting just a hair to make a pit, 1400rpm or so and .001 feed, .02" peck. That seemed to work for 6 parts or so. That's using a regular old black oxide jobber drill. All the high perf cobalt drills (Nachi) broke immediately (didn't even get one hole) Called them and ran their data, no luck.
I have more of those jobber drills coming since they at least kind of work but damn, I did not expect this.
Curious how you all do it. Note, Grade 2 is softer than 6Al4V
4-40 thread, 2.3mm tap drill (so 65%ish thread) No trouble drilling, however, taps explode without fail. We're using dormer/regal taps for Ti, Union Butterfield tap goo and have good rigid tapping on an 8 month old Okuma M560v.
I have an extensive tooling background and my guys aren't stupid but this one's getting the better of us. We have resorted to bringing in threadmills which I think should work fine.
But what the heck? We've tapped hardened steel and super duplex stainless with ease.
In the lathe-
.043" drill. We're spotting just a hair to make a pit, 1400rpm or so and .001 feed, .02" peck. That seemed to work for 6 parts or so. That's using a regular old black oxide jobber drill. All the high perf cobalt drills (Nachi) broke immediately (didn't even get one hole) Called them and ran their data, no luck.
I have more of those jobber drills coming since they at least kind of work but damn, I did not expect this.
Curious how you all do it. Note, Grade 2 is softer than 6Al4V