From: Dave Rose (cactuscowboy@attbi.com)
Date: 02/09/03-11:09:00 PM Z
Dear Gordon:
I've never measured the output of my "Dirt Devil" vacuum, although it's
powerful enough for my homemade 20x24" vacuum frame. I have no idea if an
aquarium pump would work. You could always try. If it does work, it would
be a quiet and effective solution.
I use 1/4" diameter Bregman pins to register negatives to paper.
Here's something I posted to the list two years ago on this subject, brought
up with a google search that hit on the archive:
"The two-hole punch I use is a common office supply item. It cleanly punches
two 1/4" diameter holes spaced about 2.75" apart. Both the film negative
and the print are punched independantly, prior to printing.
Bregman pins are available in varying heights. The pin (as supplied) is
spot welded onto a thin piece of stainless steel. Therefore the pins need
only be attached to the negative and print. Easy to handle, easy to work
with.
Sequence for registration: two Bregman pins are inserted through holes in
the print paper, from the backside. Negative is laid on top and pushed onto
the pins. Now the negative and print are attached to each other, in a
manner that is secure, and easily repeatable for subsequent printings."
Note that the polyester oversheet on my vacuum frame conforms to the
additional bulk of the pins, while maintaining excellent contact between
negative and paper. Bregman pins or "stripping pins" should be available
from graphic arts/printers supply houses.
Dave in Wyoming
----- Original Message -----
From: "Gordon J. Holtslander" <holtsg@duke.usask.ca>
To: <alt-photo-process-l@sask.usask.ca>
Sent: Sunday, February 09, 2003 9:31 AM
Subject: Re: Homemade vacuum easel
>
> Dave:
>
> How "much" vacuum is needed in for a vacuum frame. I want to build one
> eventually. I could use anything from a high capacity vacuum pump to a
> small aquarium pump - (replumbed to suck rather than blow). The
> University her sells off surplus scientific equipment, that can be
> converted to darkroom uses.
>
> What do you use for registration (for multiple prints) My registration
> method is very primitive - pins stuck pointy end up though a porous base
> board, through the print paper and then through the negative.
>
> These would poke holes in the polyester.
>
> Gord
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