Re: ATM 21" f/6 - Rough Grinding

[Shane_Lapierre@aici.com]

My 20" weighs 50 lbs.  A 22 might even weigh more... I think most people
grind TOT when there's no machine convenient for this sized mirror.

Just my thoughts,
Shane





Aplanatic@aol.com on 08/09/2000 02:03:13 PM

Please respond to Aplanatic@aol.com

To:   atm@shore.net
cc:    (bcc: Shane Lapierre/CT/AICI/US)
Fax to:
Subject:  Re: ATM 21" f/6 - Rough Grinding






>   - Rough ground for an hour last night with 60 grit, using a long W
stroke
>  (center of tool moving out to within an inch or two of the mirror edge.
>  Working with tool on top, since I'm not comfortable with constantly
handling
>  the mirror.

No, no, no.  To hog the mirror, keep the mirror on top and use tangential
strokes, in other words, get the center of the mirror as close to the edge
of
the tool as possible without falling off the edge.  After 20 wets of this
do
10 wets of CoC and estimate the sagitta.  Repeat as required.

Dave Rowe.








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