🚀 go-pugleaf

In reply to an article by dlou@dino.ucsd.edu (Dennis Lou),
francis@cs.ua.oz.au (Francis Vaughan) writes:
 
>I built a simple vacuum board (a thin flat box with grooves on the top
>and holes in the grooves that penetrate into the box, and a hole in the
>bottom of the box to connect to a vacuum cleaner, a few minutes work
>if you have a router, a bit longer if you have to carve the grooves 
>(about 1/8" wide and high)) onto which I place the coated board and then
>the artwork and then some cling-wrap. Start the vacuum and the whole lot 
>goes very solid. Expose. I expose in the sun, (about 3 minutes in bright
>sunlight) or you can buy an appropriate lamp. If you try the sun you
>should do a few trail runs to get the exposure right for your combination
>of chemicals and weather. The results I have had have been consistently
>better than bought boards. It only remains to drill the board. (Get
>a tungsten carbide drill bit.)
>
>Hope this is of some help.
>
>							Francis Vaughan.

I saw a very cheap alternative for this in a magazine some years ago. Basically 
what you need is one of those zip up plastic bags, (big enough to hold the pcb)
a piece of foam rubber and another board about the same size as the pcb.

The foam is sandwiched between the pcb (light sensitive face outwards) and the
other board. The layout sheet is placed on top of the pcb and the whole lot put 
in the bag. Squash the bag to expel most of the air and zip it up - the layout
should stay in place for long enough to expose the pcb.

Cheers, Trev..

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