From: epona (acolyta@napc.com)
Date: 08/27/02-01:10:23 PM Z
This may be a silly question, but I am assuming you place the plate dead
center, right? Then what do you do about the pin in the center designed to
hold the record in place?
thx,
Christine
William Marsh wrote:
> You might try placing the plate on a turntable from an old phonograph,
> set on 33rpm (or slower). Turn on the turntable, pour on the emulsion
> in the center of the spinning plate, stop pouring before it reaches the
> edge of the plate. An amazingly flat even coating will be achieved.
> You can then turn it off, allowing it to spin down by itself. If you
> stop it abruptly you will get a wave of emulsion - a "hump" as it were -
> across the plate. The turntable must be very level, and the plate must
> be allowed to dry in place. If you move the plate before it dries, you
> will affect the evenness of the coat.
>
> This should work for plates up to about 11x14 on 18 guage copper,
> somewhat larger on lighter plates. The motors of turntables were not
> designed for this, obviously, so weight of the plate, as you go larger,
> becomes a problem. You might have to help the spinning get going on a
> really big plate.
>
> Plate spinners were used in the printing industry for years, but now
> with everything going digital, nobody uses them anymore. It could be
> possible to find one at a graphic arts salvage place for a good price.
>
> One drawback is the emusion that is slung off during coating, but the
> evenness you can achieve is amazing.
>
> Oh yeah, I forgot that it really helps if the plate has been
> "de-greased" before coating. This allows even wetting over the entire
> surface. In other words, if you run water over the plate, and the water
> doesn't run off in a smooth sheet (if it "beads up"), then the plate
> needs to be degreased: scrub the plate with alcohol, then rub the plate
> with a mixture of water and pumice powder (hardware store) on a paper
> towel or sponge. DON"T TOUCH THE SURFACE OF THE PLATE WITH YOUR
> FINGERS, or you'll have to start over. When you rinse the plate, after
> these treatments, the water should run off the plate in a sheet, no
> beading up. Let it dry, then coat.
>
> Bill
>
> > Margery wrote:
> >
> > Nothing as interesting as when is porn porn, the meaning of
> > postmodernism,weston's peppers and the value of contemplating women's
> > breasts. Just a mundane inquiry: I am trying to coat the metal plates
> > supplied by Rockaloid with Ag Plus emulsion. They recommend pouring a
> > small puddle onto the middle of the 4x5 plate and moaving the plate
> > around so the stuff is distributed, and using a finger to push it
> > toward the corners if necessary. Using a finger doesn't work at all
> > for me-- and I am not getting anything resemble even coating although
> > the emulsion is liquified as per instructions.I've tried a foam brush
> > an d hake brush too, with very messy results. I'm new to liquid
> > emulsions -- are some better than AG Plus for working on metal? or
> > paper? All responses much appreciated.
> > Also -- could someone reind me about how one accesses the list's
> > archives? Thanks.
> > Margery
-- ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ "The most beautiful thing we can experience is the mysterious. It is the source of all true art and science. He to whom this emotion is a stranger, who can no longer pause to wonder and stand rapt in awe, is as good as dead; his eyes are closed." -Albert Einstein
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