Re: [ATM] Dental Stone Tool

["Paul" <guardian@reaper.org>]

Troy,

I coated my dental plaster in fibre resin a few times just to ensure it 
doesnt chip/crumb, one of my recent mishaps occured apon completing my fine 
grinding, I chipped the dental plaster and little crumps fell onto the 
mirror surface, resulting in a lovely 4 hour regrind to get the scratches 
out!

If you remake the tool you'll have to spend a few hours reshaping the 
tool/mirror anyway.

MY opinion (note mine) is to seal it before grinding.

-Paul

----- Original Message ----- 
From: "Troy Madden" <tmadden12@hur.midco.net>
To: <ATM@atmlist.net>
Sent: Tuesday, October 11, 2005 11:01 AM
Subject: [ATM] Dental Stone Tool


> Hello Everyone,
> This is my first post on your list. I am attempting to make my first 
> mirror, from a 8" f6 full thickness pyrex blank from Newport Glass. I am 
> using a dental stone and tile tool. I am wondering if I should have sealed 
> the tool. I read that dental stone will not cause scratches and sealing 
> was not needed, but I am not sure. The tiles have worn to where in places 
> around the edge the dental stone is contacting the mirror, is that OK? 
> Fine grinding seems to progressing well, but I am seeing a few large pits 
> with the magnifier. I have been carefull about cleaning between grits, I 
> don't think that is the problem.
>
> Thanks,
> Troy
> _______________________________________________
> ATM mailing list http://www.atmlist.net/ 

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