While following Poison's posts about his Ti electrical mounting plate, I remembered about a good drill for drilling safety wire holes in Ti nuts and bolts, found only by trial and error. It is a 1/16" jobbers' drill bit for shallow holes made of cobalt steel. Works good on stainless too. When drilling Ti they work best at pretty low rpm's and a fair amount of pressure so nice chips come out. They are good for MAYBE a half dozen safety wire holes, if you're lucky. They will loose their good cutting edge and break. There may be better TI drills out there, but I stopped looking when I found these.
Bill
McMaster-Carr # 3146A112
http://www.mcmaster.com/#catalog/118/2437/=h8trlc