Homebrew PCBs

On Sun, Dec 21, 2008 at 2:54 PM, William Alford <walford@...> wrote:
> At 01:29 PM 12/19/2008, you wrote:
>>Does anyone know if I would get away with drilling glass with a
>>standard tungsten carbide drill bit set. The spindle speed of my mill
>>goes up to 60krpm.
>
> i've drilled glass and ceramic tile and stone. you need to drill
> *slowly*. and spray repeatedly with water to keep cool and remove
> residue. i've used tungsten carbide bits (can get at home depot in a
> few sizes) and they do work but have a short lifetime. i got about 6
> - 10 holes per bit before wearing out. most of my drilling was in
> 1/4" glass and granite, so i don't know what thickness you intend.
> diamond bits are better, but still require water to last.

I heard that it helps to drill the glass underwater, if you can
arrange that. Never tried it though...