[ATM] Fixing edge zones

[Mel Bartels]

I consider this good advice because often, in the end, you get to the
finished figure quicker if you start with a spherical smooth beginning.
Going back to spherical is always good advice because you can't go wrong
with this approach.  Continuing to fix a figure with major problems can be a
black hole that will suck your enthusiasm across the event horizon!

Mel Bartels



-----Original Message-----
From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf Of
Mike Coslo
Sent: Thursday, October 08, 2009 6:09 PM
To: atm at atmlist.net
Subject: Re: [ATM] Fixing edge zones


> I'm in the final stages of figuring my first 8" mirror.  I first over shot
> the parabola by quite a bit, but with some help from the experts, I was
able
> to get close to a parabola using COC strokes.  Using figureXP, my
wavefront
> error is about 1/3 wavelength.  I need to increase the ROC of zones 3 and
4
> (I'm using a 4 zone mask). My question is what type of stroke do you
> recommend using to knock these zones down? Any help would be awesome! 

This is non-standard advice, but you may want to go back to a sphere, 
and then take it to a parabola. Occasionally a mirror can be overworked.

	 - Mike -
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