Re: ATM: 1st time Parabolizing Nightmare.

[Brand <huntb@ucs.orst.edu>]

On Fri, 6 Sep 1996, Michael Spooner wrote:

> What stroke have you been using? A lot of the literature suggests a 
> W stroke to help smooth things up but with soft pitch you will end 
> up with too much correction. I've had a little luck by keeping the 
> temp down and using 1/3 length straight strokes at about 80 to 100 
> per minute. 

I used the W stroke to smooth things out, but ended up with a dip in the 
center. I continued with the "accented pressure" stroke (or whatever it's 
called) to try and reduce everything but the center. I'm pretty close and 
am thinking about starting parabolizing it again, even with the small 
dip. Hopefully, if I'm careful, I can parabolize the rest of the mirror 
and the dip will stay where it is. If it doesn't work, I'll be bringing 
it back to a sphere once again. I'm definately getting lots of practice.

Thanks for the reply,
Brand

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Brand Hunt                 Email: huntb@ucs.orst.edu
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