Interesting web site that talks about this technique...
http://manufacturingcenter.com/man/articles/0704/0704Waterjet.asp
RO
----- Original Message -----
From: "P T Chambers" <ptchamb@No-Spam>
To: <jvn@No-Spam>; "The Astronomy Connection" <sf-bay-tac@No-Spam>
Sent: Tuesday, March 08, 2005 10:18 AM
Subject: Re: [TAC] Scope of confusion
> The technique I am speaking of uses something like 40,000 psi water. Cuts
> most anything absolutely cleanly and with no heat build up (one of the
> uses is to cut very high strength steel where heating would damage the
> heat treat). No chipping either.
>
> ---------
> Phil Chambers [ptchamb@No-Spam] (S.F. Bay Area - Calif. USA)
>
> On Tue, 8 Mar 2005, Jim Van Nuland wrote:
>
>> P T Chambers wrote:
>> > This thread makes me wonder if anyone is using high pressure
>> > water (with grit) to cut glass???
>>
>> The big danger in cutting a finished surface is heat -- the hole saw
>> can produce enough heat to relieve strain in the glass, just enough to
>> damage the figure. The usual technique is to bore nearly through from
>> the back, fill the cuts with wax, then finish the figuring. The final
>> cutting must be done very slowly. And there's the danger of chipping as
>> the saw bites through.
>>
>> The water can eliminate the heat, and probably also the risk of
>> chipping.
>>
>> --
>> Jim Van Nuland, San Jose (California) Astronomical Association
>> JVN's web site
>>
>>
Received on Tue Mar 8 12:36:32 2005