From: "Russell Jocoy" 
To: martin.cibulski{at}degussa.com, atmpob{at}yahoo.com
Cc: atm-digest{at}shore.net
Reply-To: "Russell Jocoy" 


>From: martin.cibulski{at}degussa.com
>Reply-To: martin.cibulski{at}degussa.com
>To: atmpob{at}yahoo.com
>CC: atm-digest{at}shore.net
>Subject: Re: ATM Nickel covered tool for 16" F5
>Date: Tue, 24 Jun 2003 11:24:06 +0200
>
>
> >From: "Dale Eason" 
> >
> >I read with interest about putting washers on a plater tool.  Then about
>using
>dumps (center of the washer), and finally using nickels.  The reports said
>that
>grinding went much faster and used less amounts of grit but to hog you
>needed a
>tool of the proper ROC.
> >
> >This is what I'm planning.  A friend has a 16" F5 waiting to
be polished.
>I
>will use that to make a subdiameter tool 12.5" out of hydrostone.  I will
>cover
>it in nickels and use that for the hogging and fine grinding.  I'm not sure
>how
>to attach the nickels.  They seem a little thin to just pour the plaster
>around
>and expect them to stay put especially after digging channels around them.
>So I
>may just epoxy them onto the surface.
> >
> >Has anyone experience with this? Does anyone want to comment?
> >Dale Eason
> >
> >
>
>Dale,
>
>I used washers on a concrete tool for fine grinding of my
>14" F5 mirror. Hogging has been done before with a iron plate
>mounted under a round plywood disk (to fit into my grinding machine).
>
>(Actually after hogging I used a tile tool with was broken
>during the 220 grit stage. Then I casted the washer tool from
>the mostly spherical mirror and later all washers had contact)
>
>I heated the tool in the oven (slowly increasing to >100 øC to remove
>any water).
>Then I painted epoxy glue on the surface about 1 mm thick and put the
>washers on it. From the heat the glue became fluid so the washers
>could sink into the glue down to the concrete surface. The washers were
>embedded in the glue, holes and gaps between them were perfectly
>filled.
>There is not very much time to put all washers on the tool because
>from the heat the glue hardens faster (less than 30min instead of
>12 hours), but finally it becomes stronger.
>
>
>I wonder if it is possible to use a spherical washer tool for hogging
>because the middle of the tool wears much more than the edge.
>So its spherical curve will be destroyed and it might take a long time
>to adapt it again to the mirror's surface ?
>Any comments ?
>
>
>Martin
>
>
>
>


("atm{at}shore.net")

       Martin,
       I would never use a tool that I spent that much time on to hog out
glass. That's what  metal pipe
caps and small dumbell wieghts, and catfood cans filled with concrete are
for... Don't waist your
trim tool for cutting a hole in the glass, you will just grind it down to a
thin useless tool buy the
time you get to 320 grit and then have to redo it all over again... really
it's true....
                                                                Russ Jocoy
("atm{at}shore.net")

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