I am attempting to drill a tool holder which is used with a BXA series tool post holder.
I need to drill four 17/64 holes (approximately 1-1.5" in depth) through the tool holder and then counter sink the holes for the use of socket head screws. A yet to be constructed series of lathe accessories will be later attached to the tool holder. Rigidity of the tool holder, as related to the attached accessory, is the driving factor in using the socket head screws.
The tool holder steel is HARD, very hard and laughs off high speed drills. A check of the Enco catalog shows a number of carbide drills, but none is recommended for steel. I figure annealing is pretty much out of the picture and I have no access to EDM. I also tried some small carbide end mills which cut the metal, but make poor drills.