Re: [ATM] Sandblasting

[richas@earthlink.net]

I have actually done sandblasting, on a 6" f/5 way back in 1971.   It took me two days of hand grinding to get rid of the central hole.   I do not recommend it.  Of course the sandblaster would not let me near the work area, and he was not accustomed to great precision...  I find that grinding mirror on top of a 3/4 diameter aluminum tool is pretty fast for removing glass and maintaining a reasonable approximation to a sphere.

As for making lightweight mirrors, my approach is well known to readers of the lost arc ives.

. . . Richard

-----Original Message-----
From: Mel Bartels <mbartels@bbastrodesigns.com>
Sent: Jul 4, 2005 11:09 AM
To: atm@atmlist.net
Subject: Re: [ATM] mirror grinding

> I've heard rumors of using a sandblaster for getting a hole done for a
> mirror but haven't heard much about it.  Brave people to do a curve that
> fast in the glass as you can eaisly overdo it in an area and then have to
> drop the rest of the surface down to compensate.  However, that would 
> indeed
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