On Jul 27, 5:44*pm, "Karl Townsend"
wrote:
I need to drill a hole in a grade 8 bolt. three actually, two cross and one
axially. I remember this was a stone bitch from last time I tried. I got one
shot this time. Should I drill it slow and hard like stainless, or fast and
light pecks? Other suggestions?

Karl

They used to demonstrate that a Cole drill machine could drill through
a drill. Slow would seem to be sure.