Re: ATM 21" f/6 - Rough Grinding

[Aplanatic@aol.com]

>   - 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.