To: "Jerry B. Hillman" ,
From: Mark Suchting 
Reply-To: Mark Suchting 


At 05:23 PM 4/30/2003 -0500, Jerry B. Hillman wrote:


>I would appreciate suggestions on how to attack the edge on this mirror.  It
>seems to be resisting all my efforts.  Inside ROC and Outside ROC pics can
>be seen at

Jerry

There seems to be a liitle TDE still there, but the outer 30% of your
mirror is now much more strongly corrected towards a parabola  and the
center is high. Concentrating strokes towards the centre will push the
lines out in the middle to blend with  the edge, and produce those familiar
smoothly bowing lines

It would be worthwhile to do some foucault measurement and see how close
you are with your correction. It would also be wise to get your tube
assembly built and start star testing your mirror. In the absence of any
star testing on the bench , you will have to do a real star test to see if
astigmatism of your thin mirror is within a level acceptable to you,
otherwise spending a lot of time parabolising will be a waste of time.

~Mark

--- BBBS/NT v4.00 MP