Re: [ATM] sub diameter tool

["Bob May" <rmay@nethere.com>]

Here's the general rule of grinding and polishing.
Put the pressure and motion where the glass needs to be removed.
All else falls from that!
The "standard" method is with the mirror on top of the tool and
as you move the mirror back and forth, the weight of the mirror
applies pressure to the center of the mirror and the edge of the
tool to make a concave mirror, etc.  You can do this "upside
down" by applying pressure on the tool to the center of the
mirror.  It works!
Subdiameter tools only mean that you can have a better control of
the application of pressure on the upturned mirror surface where
you want it to be and remove the glass in that area.
Bob May

rmay at nethere.com
http: slash /nav.to slash bobmay
http: slash /bobmay dot astronomy.net

----- Original Message -----
From: shyam rathod <iloveyawli@yahoo.com>
To: <atm@atmlist.net>
Sent: Saturday, May 03, 2008 10:08 PM
Subject: [ATM] sub diameter tool


> Dear List
>   can anyone guide me with using sub diameter tool were can I
find literature on sub diameter tool ...........I am using a
8.25"flote  tool on top of a 12" Pyrex blank.........I really
don't know what type of stroke will do what to the curvature
..........what will happen using subdia tool in a draper machine
which has ellipsoidal stroke and never pass centre over centre
...........some details like the table is 6 rpm and arm 40 rpm
>
>
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