Re: [ATM] Argh! How do I fix this?

["Francis J. O'Reilly" <foreilly@verizon.net>]

Mark,

Respectfully, not even close. When you hot press a lap, you should move the 
mirror around. There will not be any high spots.

The chip is not a big deal, it happens to all of us. I recommend that Dave 
just re-bevel the lap to prevent any more chips and move on.

The finished mirror will (and should) have a bevel. This will prevent 
chipping in the future when the mirror is handled, taken out of it's mount 
and variosu other sources. It is just the way of the world.

Francis J. O'Reilly



----- Original Message ----- 
From: "Mark Holm" <markholm@verizon.net>
To: <atm@atmlist.net>
Sent: Saturday, February 23, 2008 6:28 PM
Subject: Re: [ATM] Argh! How do I fix this?


>
> I've got a question.
>
> Say Dave ignores the chips, finishes 9 micron and goes to polishing.  When 
> he presses his lap, the chips will leave high
> spots on the lap.  Not large of course, but there all the same.  These 
> will cause accentuated local pressure.  For long
> polishing spells, they will get worn down and the effect won't be large, 
> but during figuring, with short spells, the
> effect may be roughness and a tendency toward turned edge.
>
> Anybody think I am, at least in principle, correct?
>
> -- 
> Mark Holm
> markholm@verizon.net
>
> _______________________________________________
> ATM mailing list http://www.atmlist.net/ 

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