[ATM] Over-shot Long. Aberration

[Jerry]

Yep it is over cooked.

There are an number of ways to back up.  One would be to use the 1/3 D
strokes near Center over Center.

Jerry

-----Original Message-----
From: atm-bounces at atmlist.net [mailto:atm-bounces at atmlist.net] On Behalf Of
michael dodge
Sent: Wednesday, September 30, 2009 6:20 PM
To: atm at atmlist.net
Subject: [ATM] Over-shot Long. Aberration


I'm making my first mirror, Finished polishing, got a pretty nice sphere (I
think) and started figuring.  I'm using a slitless tester (moving light
source), all was going well until in dawned on me that I need to double my
knife edge readings!!!! Duh!!! Now I think I have over shot my "ideal"
longitudinal abb. by a considerable amount!  What can I do? Here are the
numbers for my mirror:

 

8" dia.

ROC=89.56

Zone 1 Radius=1.47

Zone 2 Radius=2.60

Zone 3 Radius=3.37

Zone 4 Radius=4.00

 

KE Readings on each zone

Z1=.000

Z2=.097

Z3=.130

Z4=.151

 

I hope I can fix this, I don't want to continue until I get some advice from
some veterans.  Thanks guys!

Michael
 		 	   		  
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