Re: Coating


Jacques Augustowski (jacquesa@acd.ufrj.br)
Mon, 08 Mar 1999 17:56:33 -0300 (GRNLNDST)


Hi Dave,
I've done that about 15 years ago. But the nice thing about this list is
that ideas from old techniques can bring some light. The technique was to
coat photoresist on copper clad boards. I got got suddenly interested again
for coating platinum/palladio papers.
What I did Dave was to drill a hole in the middle of a round( or square )
plastic bucket and put a 1/4" rod about 4" long through the hole
attached to the drill chuck. The electric drill was fastened to a type of
adjustable saw horse ( Balck & Decker ). The Bucket was supported on top of
two wooden blocks, laid on top of the saw horse. This kind of saw horse
has an adjustable platform. Next I got a piece of plywood a little bit
larger than my work and drilled a 1/4'hole and glued with epoxy the other
end of the 4" rod. At the inside of the bucket, at the hole, I glued a
1" PVC x 2" to form a small dam to avoid the excess of the emulsion to
flow through the hole on to the drill. The height of the plywood is
adjusted, so that when you spin the small platform, the coating will not
fly off.
Jacques

On Fri, 5 Mar 1999 FotoDave@aol.com wrote:

> In a message dated 3/4/99 10:38:44 PM Pacific Standard Time,
> jacquesa@acd.ufrj.br writes:
>
> > I used a variable speed drill spinning
> > the board with the emulsion on top. Spinning at various speeds gave
> > different coating thickness. It is a little messy, and it should be done
> > in a big bucket, or else you will have emulsion flying around.
>
> Jacques,
>
> I would appreciate it greatly if you could give some details on how you
> prepare the coating of the board.
>
> Dave S
>



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