From: "Mike Spooner" 
To: "Matthew L. Brown" ,

Reply-To: "Mike Spooner" 


Matt,

How hard is your pitch? If the lap is too hard it often will dig a hole
quickly as it simply won't flow quick enough to help smooth the surface. I
completely disagree with the old literature about soft laps "plowing
the mirror edge and wearing a TDE". The most perfect edges I've
produced on optical surfaces used extremely soft laps (they had to be
rechanneled at least every hour) though I was using them on a machine.
(Didn't matter if it was MOT or TOT but for hand work I'd do TOT). I
haven't done much hand work for years so YMMV.

Best,
--Mike Spooner

----- Original Message -----
From: "Matthew L. Brown" 
To: 
Sent: Saturday, March 08, 2003 11:32 PM Subject: Fwd: Re: ATM Still Edgy


>
> Rick,
>   I did 30 minutes 1/3 to 1/2 stroke MOT COC.  As expected, there's a very
> short radius hole in the center, a nice smooth sphere outside it, and the
> edge doesn't look much different, though I'm willing to give it more of a
> chance.
>
> Richard,
>   I tried that, and all I got was a deep well in the center, as if the
> outside edge wasn't getting any wear at all.  I'm stumped!
>
> =Matt

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