Re: ATM Stroke for flatening flats

[Anthony Stillman <atmer@flash.net>]

>
>
>       *                             *
>   *       *                     *       *
>*              *             *               *
>                   *   *  *
>
>...high point is about 1/2 wave.


Frank,

A classical swan profile, otherwise know as spherical abberation (1st and
3rd orders) .  Flip often, press often, test often.  Use a C/C stroke just
shy of 1/3 radius.  Let me add, using a full sized lap I've never been able
to beat this down to less than 1/8 wave (1/4 fringe) and using a
sub-diameter lap and minus-ring lap just made a mess of it.  One of these
days I'll make the CP I've always wanted.

Anthony