Re: [ATM] Ain't got no shperometer

["Norm Prince" <princenorman@bellsouth.net>]

Look at the glass...are the pits even?...is the outer portion getting even 
pits before the inner or vice versa?....If you are alternating tot and mot 
with more or less randomly even intervals then it should be as close as you 
are likely to get if you don't have someone who has done it to give you a 
direct second opinion...Does it feel like the action of surface on surface 
is smooth?...

you seem to know enough about what you are trying to do to have actually 
tried it so keep going and you will soon find out what you have and haven't 
quite done...of course take whatever bits of advise you find on list they 
are groovey dudes and know infinitely more then me...

but from one inexperienced cat to another...without that hands on "here you 
look at it"...kind of back and forth with someone who has tried it too, we 
are working on a learn by doing basis...so go with your gut and see what 
happens...

-Norm Prince

----- Original Message ----- 
From: "ArtfulBodger" <artfulbodger@earthlink.net>
To: <atm@atmlist.net>
Sent: Tuesday, November 27, 2007 09:35 AM
Subject: [ATM] Ain't got no shperometer


> What's the most accurate way to judge sphericity if you don't have a
> spherometer?  Is it the Sharpie test?
>
> I'm sorry, thie is probably a FAQ.
>
> I know there are other ways -- reading the bubbles between tool and
> mirror, judging the feel of the mirror sliding on the tool -- but
> they seem to need a good bit of experience.  Seems like the Sharpie
> test is closest to objective.  Or am I wrong, and is there a more
> precise test that I don't know about?
>
> Gotta make me a spherometer, it's on The List, but my list is as long
> as yours is....
>
> So.  Sharpie, yes?
>
> Pete
>
> -- 
> Artful Bodger
> http://www.artfulbodger.net
> _______________________________________________
> ATM mailing list http://www.atmlist.net/
> 


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