Re: [ATM] reducing mirror weight by sandblasting

[bchilders@everestkc.net]

Dan, Your calendar still shows got another week before April fools, yes?  

You said it's 1/2" in thick now right?  Just one man's opinion but to start sand-blasting a completed, polished, mirror that's already considered light weight seems to be folly.  Possibilities for blasting too thin or through, induced strain, or accidently scratching the mirror surface are the risk I'd be worried about.  

If you really really wanted to cut pockets like this I would think a diamond bit cutting CNC machine would give more precise control for depth, etc.  But I still can't imagine it's worth the effort. 

If you want some more details about glass sand-blasting rates and masking you might try a sculpture list.  I've seen artist work that was done by sandblasting relief into glass.

-Buck


----- Original Message -----
From: Dan Feldkhun <glasspusher@mindswell.com>
Date: Tuesday, March 23, 2004 8:01 pm
Subject: [ATM] reducing mirror weight by sandblasting

> Hi all,
> 
> I am thinking about reducing the weight of a 12.5" pyrex mirror 
> blank by 
> sandblasting pockets on the back side.  I've never done this 
<snip> 
> My goal is to remove 1/4" - 5/16" deep pockets (the mirror is 1/2" 
> thin to 
> start out with).  I haven't figured out the best pocket shape yet, 
<snip> 

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