Be warned that you *will* need (tiny) solid carbide end mills,
and that the swarf will be *very* abrasive to your machine's ways, so
better fix a shop vac to control the waste.

HSS *will* go dull so quickly you won't believe it with any form
of fiberglass epoxy printed circuit board material.

Good luck,
DoN.

--

Don is correct about the drill bits. Sometimes resharpened, but
rejected bits are available on EBAY. Also, be aware, your equipment
will never be able to turn the drill bits fast enough and they will
probably break on you. They need to turn 20,000 rpm of faster.

Also, good luck!

Paul