[ATM] Fw: Scratches keep forming on edge of mirror

[Don R Surles <Don.R.Surles-1@usa.dupont.com>]

Adam and Bill,  sorry...I sent my reply to the wrong address...Don...


----- Forwarded by Don R Surles/AE/DuPont on 08/16/2007 12:35 PM -----

Don R Surles/AE/DuPont
08/16/2007 12:33 PM

To
bmarriott@pacbell.net
cc

Subject
Re: [ATM] Scratches keep forming on edge of mirror





your mirror may have a sharp edge and the tiles could be fracturing the 
glass/edge and dragging the chips across the mirror surface.

if this is the case then beveling the edge of the mirror (1/8" at 45 
degrees) will help...the bevel should be smoothed to something close to a 
400 grit grind or smoother if possible...you don't want small fragments of 
loose glass during fine grinding, polishing, and figuring.

Don...





William Marriott <bmarriott@pacbell.net> 
Sent by: atm-bounces@atmlist.net
08/16/2007 12:23 PM
Please respond to
bmarriott@pacbell.net


To
atm@atmlist.net
cc

Subject
Re: [ATM] Scratches keep forming on edge of mirror






Adam;

You say that the dental plaster is not sealed. Does
there seem to be any kinds of granular material come
off the tool side if you rub it with your hands?
Perhaps it might be wise to coat the tool with
somekind of sealant to minimize, or at least eliminate
this as one of the variables that could be causing the
scratches.

Bill Marriott
StarlightOptical.com
--- Adam Krause <krausea34@yahoo.com> wrote:

> Dear ATMers,
> 
> I have made my tile tool and it now has good contact
> with the mirror surface (8" f/6.2) after grinding
> with
> 120 grit, then 220.  The tile tool is made from
> dental
> plaster- not dental stone, and is not sealed.  I am
> having a recurring problem with scratches.  These
> scratches are forming on the edge of the mirror
> only. 
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