ATM forwarded message about dog biscuit

[Mel Bartels <mbartels@efn.org>]

> From: Buck Childers <buckchil@sound.net>
> To: atm@shore.net
> Subject: Dog biscuit?
>
> Why is a rough surface called dog biscuit?
>
> How do I know if I have it?  What does it look like in the tester?
>
> Oh, by the way, let me re-introduce myself.  I'm Buck Childers.  Although
> I've participated in the list in the past, I unsubscribed about a year ago
> when other things took priority.  (Actually I think I just feared
> finishing the mirror I was working on)  I'm resurfacing to complete the
> project.  It's a 10" f5.8.  The mirror is, as far as I can tell,
> completely polished.  Two days ago when I tested it the (Ronchi) bands
> looked like a beach ball but a little fuzzy in center.  I Though this
> was good.  I've got some correction going.  Last night I polished some
> more and somehow dug a bit of a hole in the center.  I was using 1/3 W
> strokes and some longer Center-over-center strokes.  Were my strokes too
> long or was just using the wrong strokes?  At any rate I want to get back
> to spheroid.  I should be using 1/3 W strokes right?  I'm using a
> full sized lap MOT.
>
> Thanks
> Have a great Day,
> -Buck
>
> Buck Childers                        mailto:buckchil@sound.net
>  | P E A C E                   http://www.sound.net/~buckchil/
>  *--------------------------> KITES - BOOMERANGS - ROOTS - ATM



--
Clear skies, Mel Bartels // Programmer/Analyst, amateur astronomer
Springfield, Oregon,     // USA homepage: http://www.efn.org/~mbartels
mailto:mbartels@efn.org  // atm, atm-digest list-owner
Motorize A Dob: http://zebu.uoregon.edu/~mbartels/altaz/altaz.html