From: "Jeff Baldwin" 
To: "Kristopher Barrett" ,
        
Reply-To: "Jeff Baldwin" 


I've used wax for trepanning, nut a big fan of that.  If it gets a little
to warm while working, the wax can partially or completely melt and expose
the glass to either grit that scratches of deposits that stain.  Blocking
pitch? JB

Jeff Baldwin
Stockton  CA
W121d20.96m N38d01.62m
bald{at}gotnet.net
http://bald.gotnet.net/
----- Original Message -----
From: "Kristopher Barrett" 
To: 
Sent: Tuesday, April 01, 2003 8:32 AM Subject: Re: ATM trepanning secondaries


>
> > Am I nuts? My idea here is to save mucho bucks. I need two
5" minor-axis
> > secondaries, and they cost about $600 apiece. Yikes. But I have a line
> > on a 11.5" minor-axis secondary for much less than that. Probably the
> > figure sucks, but as a proof-of-concept getcha-by solution, it's mightly
> > attractive, ... if I can cut two 5" secondaries out of it.
>
> I would suggest using straight cuts to approximate what you want ( make it
> a bit larger than you need ), and then bond the diagonal to the face of a
> diagonal cut block ( a chunk of wood 5" round and cut diagonally would be
> perfect ).
>
> Coat the surface in wax to protect it, and then grind the edges to suit on
> a fine wheel.
>
> The big danger here is, of course, cracking. Go slow on the grind.
>
> --
> Regards,
> Kristopher Barrett    http://www.cotse.net/users/kbarrett
>
>
>
>

--- BBBS/NT v4.00 MP