From: "Dwight K. Elvey" 
To: atm{at}shore.net
Reply-To: "Dwight K. Elvey" 


>From: "Robert Fifarek" 
>
>I am wondering whether the need to have wide and deep grooves in the
>pitch polishing tool is really necessary? I am polishing out an f4, 16"
>plate glass mirror. The gugolz pitch is working well, but the grooves are
>starting to close up. I can clearly see the grooves through the back of
>the mirror when I am  MOT, and the polishing mixture flows through the
>grooves. So when and how deep should they be to continue? Also, I do not
>receive any email from the list anymore, and do not know why. Could
>someone please respond to this email if for nothing else, just to see if
>it works for me? Thanks.
>Rob in Ramona
>
>

Hi Rob
 The grooves don't need to be wide but should be a
minimum of 1/16 to 1/8 inch deep. I recut my grooves with a saw blade and
running water. The saw could be a fine wood saw, such as is used with most
mitter box saws or a coarse hacksaw blade. 10 to 15 teeth per inch seems wo
work well.
 Use light pressure and keep water running over the
surface to keep the fresh chips from sticking. Use less pressure when the
lap is cold and more when hot. It is a kind of feel thing. You don't want
to chip out large chunks.
Dwight

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