Tim Killian wrote:
A laser will do it, but there will be a slight (0.1 mm) taper in the
hole. Single flute carbide drills will probably work if you have
everything clamped properly and use a slow feed with plenty of
coolant.
Charles Morrill wrote:

Is it possible to drill a hole in High Speed Steel? What sort of
drill bit do you need? I need to drill a 4 mm hole through some 4
mm material. Thanks, Charles
Guy Lautard claims that a "Cole Drill" will do it.
Ken.

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