[LargeFormat] Part 2 Hold ON!! Graflok ground glass

[Ken Hough]

Clive,
I have made lots of ground glass. When I use grinding compound I place a 
1/2 inch plate glass on the bench and a slurry of roughing powder and water.
Then I put the piece to be ground on top and start a figure 8 motion.
I'll work it till the appropriate grind is done. But the acid is available in 
different grades. Coarse to fine. So no more hand grinding!
Ken 

To:             	largeformat@f32.net
From:           	Clive Warren <cocam@cableinet.co.uk>
Subject:        	Re: [LargeFormat] Part 2  Hold ON!! Graflok ground glass
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Date sent:      	Sat, 15 Dec 2001 14:39:45 +0000

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At 2:31 pm -0600 14/12/01, Ken Hough wrote:
>Has anyone besides me done this?
>Ken
>
>>HOLD ON !! You need the following:
>>   .062 thick glass. Go to a glass shop and have them order a sheet for you.
>>If they will not try another glass shop. Or a stained glass shop.
>>Pittsburgh Plate glass makes it. A 2x3 foot section costs 22.00
>>Second, while at the stain glass shop get some acid etch for your glass.
>>3rd. Get the glass cut to size minus 25 thou on 2 sides. This insures
>>it will float a bit in the frame. Now the fun part. Put heavy clear 
>>packing tape
>>on one side of the glass. Cover the whole side. Cut the excess tape off.
>>Now apply the Acid etch. DO NOT LET THIS STUFF CONTACT YOU
>>OR ANYTHING METAL. Do it in a tupperware tray. Let it etch fo the
>>proper time. READ THE INSTRUCTIONS!. Rinse and remove the tape.
>>Guess what kiddies! You have ground glass. Remember do not be afraid.
>>My Motto is JUST DO IT.
>>Ken

Looks like you're one of very few Ken!

I have used fine grinding paste (aluminium oxide) and some sheet 
glass and produced reasonable results. It is easier to focus with a 
ground glass rather than etched glass in my experience. However the 
image quality on an etched glass is significantly higher and in most 
cases preferable if focusing is not a problem.

Cheers,
        Clive

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        ******Ken Hough Photographic Repair******
         Specializing in Deardorff Refinishing
          Lens Recementing and Shutter repair
          Contribitor to McKeowns Price Guide
                   Deardorff Section
           Custom machined Photographic items
           Text Contents Copyright 1999 KHPR
          http://deardorffcameras.0catch.com/
                   Est. 1980