To: atm{at}shore.net
From: tkrajci{at}san.osd.mil
Reply-To: tkrajci{at}san.osd.mil


> From: James P Crombie 

>   Just finishing up some more pieces for my mirror grinder.  An aluminum
> plate to attach to the back of the mirror with  a ball joint.to connect
> to the overarm of the grinder.
>   I was wondering what the usually method of attaching the mirror to the
> plate would be?  Pitch, tape??
> And would putting a piece of ply(1/8") on the bottom of the alum offer a
> better surface to attach to.
>   Mainly worried about how well  the pitch will stick to the aluminum.
> some pictures of the latest parts.
> http://users.eastlink.ca/~jpcrombie/pics/mirrorplate%201.jpg
> http://users.eastlink.ca/~jpcrombie/pics/mirrorplate%202.jpg
> http://users.eastlink.ca/~jpcrombie/pics/mirrorplate%203.jpg

On the 20 mirror's I've ground on a machine (4 1/4 to 16 inch), I never
used pitch, so I can't comment on how well it can/can't work to attach the
mirror to the machine.

I merely used a plywood fixture with three adjustable cleats to hold the
mirror (or tool).  The arrangement of the cleats was essentially just the
same as the cleats on a grinding stand that users of 'armstrong' grinding
favor.  ;-
)

Tom Krajci
Tashkent, Uzbekistan

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