ATM RE: Keep Polishing or Back to the old Grind?!

[Adam Rosenberg <adamr@synopsys.com>]

Ken,

What I was getting at here is that I started at 5 wavelengths out
and now I'm at 2.5.  Since this is my first time around I haven't 
a clue how much effort it will be to improve this surface.

Adam R.

At 02:40 PM 7/13/99 -0600, Bertapelle, Ken wrote:
>Adam,
>
>Please clarify your question.  What do you mean by 1/.2 and 
>1/.4?  For example, 1/.2 = 1 divided by .2 = 5?  Or, do you
>mean 1/.2 = 1 and .2 = 1.2?  Or do you mean something else?
>
>I'm interested in the answer to this too, but I think there
>will be some ambiguity in the responses you'll get due to
>the way you described your problem.  Thanks.
>
>- KenB
>
>> -----Original Message-----
>> From: Adam Rosenberg [mailto:adamr@synopsys.com]
>> Sent: Tuesday, July 13, 1999 1:46 PM
>> To: atm@shore.net
>> Subject: ATM: Keep Polishing or Back to the old Grind?!
>> 
>> 
>> 
>> I recently finished polishing and started figuring my first
>> mirror(10" F/6).  Initial readings told me that in zone 3 on
>> a 5 zone mask I was out by 1/.2 wavelengths.  I've spent about
>> 4 hours grinding out the outer half of the mirror to bring it
>> down to the hole in the center and now have readings of 1/.4
>> in zone 3.
>> 
>> Here's the question, am I that far out that I'll make better 
>> progress going back to say 220 grit or does it make sense to
>> put some more hours in figuring this thing.  I've seen too many
>> past threads where people spend their life trying to polish out
>> something they could have ground out in 8 hours.
>> 
>> Thanks,
>> 
>> Adam R.
>> 
>
>