Homebrew PCBs

----- Original Message ----- 
From: "James Bishop" <bishopaj@...>
To: <Homebrew_PCBs@yahoogroups.com>
Sent: Sunday, December 21, 2008 11:39 AM
Subject: Re: [Homebrew_PCBs] Re: Copper Foils


> 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...

I think you mean cutting glass with scissors underwater. I used to think 
that was an old wives tale, but I've heard of people doing it.

Leon
--
Leon Heller
Amateur radio call-sign  G1HSM
Yaesu FT-817ND transceiver
Suzuki SV1000S motorcycle
leon355@...
http://www.geocities.com/leon_heller