I am trying to drill a 3mm cross hole through the head of a 18-8 stainless steel hex head screw . I am using a hand drill with a 3mm drill bit made of Titanium-Nitride (TiN) Coated High-Speed Steel.
Despite my efforts, I'm not able to make more than a dent in the screw head. The dent is shallow enough that the drill bit doesn't even stay put; it tends to slide side to side. I am surprised because the drill bit is advertised to be suitable for stainless steel.
I've tried drilling at different speeds and with varied pressure. I kept the contact point lubricated. Here's the photo of the result so far.
Would you please advise me on how I can proceed? Is drilling a cross hole through a screw a fool's errand? What's the best tool for the job? Can it be done with a hand drill or Dremel?