From: "Richard Schwartz" 
To: 
Reply-To: "Richard Schwartz" 


I would modify the procedure below in the obvious Richard way:

Put a couple grains of 80, 120, 240, and 500 grit next to the scratch.
Grind one half stroke at medium pressure with your tool, and see which grit
your scratch matches.



----- Original Message -----
From: "Thomas A Simmons" 
To: 
Sent: Friday, February 21, 2003 5:45 AM Subject: re: ATM ARGH! A Scratch


>
> Scott,
>
>   Put a couple of grains from the 120, 240 and 500 grit next
> to the scratch and use your 10X magnifier. Which ones are larger
> than your scratch?
>
>   Unless you got a scratch from one of your tiles, I'll bet a
> couple extra wets with your 500 will fix it. Now you know not
> to let the wet dry out, and I'll bet you won't do it again ;-)
>
> Tom
> Tucson, AZ
>
> Date: Thu, 20 Feb 2003 12:54:54 -0800
> From: "Scott Berfield" 
> Subject: ATM ARGH! A Scratch
>
> =20
> =20
> Sigh. I was pretty much done with 500 grit on my 12 1/2" -- and quite
> pleased with how well it was going. As the mirror dried I saw a 1/2"
> long scratch appear. It looked like a surface scuff but after anotehr
> wet it showed its true nature - craters the size of elephants (well at
> 10X anyway) in a line. I am not a good judge of sizes, but these look
> larger than the 500 can easily get rid of. I know I need to drop back a
> grit size and get rid of this horrible thing, but is there a good way to
> estimate whether I need to go all the way back to 120, or if 240
> suffice?=20
>
> - -sb
>
>
>
>

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