Re: [ATM] How round and how square should it be (blank mirror)

["Thomas Janstrom" <thomas@moiler.com>]

Hi Roman, 

I would suspect that because you managed to trepan the glass OK that you can
skip the polariser film, but if still want to get some, Surplus Shed
(www.surplusshed.com) usually has some in their miscellaneous items
category, another place is Willman-bell (I don't think you can order it
online, and I don't know their contact numbers as I haven't dealt with them
personally). I'm sure there are many other suppliers out there, if all else
fails you could always use an old pair of Polaroid sunglasses, one lens at
your light source the other between you and the glass. Just rotate the one
you're holding to find the right axis.

Cheers, Thomas.

-----Original Message-----
From: atm-bounces@atmlist.net [mailto:atm-bounces@atmlist.net] On Behalf Of
Roman Toledo
Sent: Thursday, 20 July 2006 7:33 AM
To: atm@atmlist.net
Subject: [ATM] How round and how square should it be (blank mirror)

          Hello gents, here's another noob question.

How round does the blank have to be and how square should the side be.

I've read how some mirrors use a sling or piano wires on the bottom
edge once mounted on it's base.

I have one piece that was done without trepanning and is "close" to
being round, I'm working on putting a good 45^  dege on it before I
continue to wet grind the edge (I know at this rate it will take even
longer)

this question even scares me ;) but I'll ask, if you plan on a 9 point
base and a piano wire sling. 

Would it be a good idea to cut a "slight" 1/16"deep groove on the 
glass edge's center so the wire stays put?  or is this too great a risk
to damaging the mirror?

also do you have a good source for  polarized film so I can test this
glass before I waste time on a useless piece.
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