I'm in the process of making a bushing using 4340 steel. The OD is 1.570", ID is 1.250" and it is 2.050" long. After turning the outside to diameter I started to center drill the second end and the bit broke, leaving the whole tip, below the taper in the work piece. I put the work in the rotary table, thinking I could mill around the broken bit deep enough that I could drill from the opposite end and then bore through to the milling cut byt eh broken center drill bit. Bad idea. I got...
Broken Center Drill In Work Piece
Broken Center Drill In Work Piece
