Re: vacuum frame design

Hi gord, this sounds vedry similar to the frames we use for screenprinting
at the art school. I've never seen any need for more than one port. I'm
talking about frames that are maybe 2' wide and 2'6" high. We use "Tellus"
brand vacuum cleaners to suck. These seem to be perfectly adequate.
Kate
----- Original Message -----
From: "Gordon J. Holtslander" <holtsg@duke.usask.ca>
To: <alt-photo-process-l@usask.ca>
Sent: Saturday, February 21, 2004 2:48 PM
Subject: vacuum frame design

> Hi:
>
> I'm making a vacuum frame. I'm using a simple design consisting of a
> piece of plywwood, pegboard, and clear mylar.
>
> The plywood has a grid of grooves or channels routed into it that will
> align with the holes in the pegboard. The pegboard will be glued on top
> of the plywood. A hole is drilled through into the side of the plywood,
> through one of the grooves, to make a "vacuum port". The mylar is placed
> on top of the pegboard. The negative and paper are placed between the
> mylar and pegboard
>
> When a vacuum is applied to the hole it is supposed to suck down the
> mylar and hold everything flat.
>
> I'm concerned that I won't get even suction with just one hole. I could
> put a hole on two or more sided and connect these with hose and or pipe.
>
> Other people use frames similar to this. Do you get even suction - do you
> need more than one spot to pull the vacuum from?
>
> I'm about to glue the pegboard on. It would be easy to add another vacuum
> port now, but next to impossible after the pegboard is glued on.
>
> Any comments or suggestions?
>
> Gord
>
> ---------------------------------------------------------
> Gordon J. Holtslander Dept. of Biology
> holtsg@duke.usask.ca 112 Science Place
> http://duke.usask.ca/~holtsg University of Saskatchewan
> Tel (306) 966-4433 Saskatoon, Saskatchewan
> Fax (306) 966-4461 Canada S7N 5E2
> ---------------------------------------------------------
>
>
Received on Fri Feb 20 20:44:56 2004