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Article #16401

Re: PC BOARD ETCHING QUESTIO

#16401
From: marxhausen paul
Date: Wed, 06 Jan 1993 13:57
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chris.guli@factory.com (Chris Guli)  writes:

>My main problem with home fabrication is getting the negative - does
>anyone have a fast/cheap way of getting a high quality negative on film
>? (SMT features)

Well, when our university Photo Productions lab makes PC board negatives
for us, I believe they are making contact negatives.  I.E. the paper artwork
is placed directly over the film in the darkroom and exposed.  (I could
be wrong, they may be using their "normal" exposure equipment).  Anyway,
even if that's not how our lab is doing it, it _is_ a way that _you_
can do it.  Exposing the film then requires only a simple light table
of some sort, and of course I assume you can whip up a home darkroom
set up to develop the results.

I haven't done this, but I've been told by someone else that the film
you want for making these negatives is Kodalith.  If would seem to me
that if you have a choice about it, you would want to produce your artwork
on paper that is as translucent as possible, such as vellum or similar.  
(It's what we use when we do our India-ink pen plots from AutoCAD or
Criterion.)

--
paul marxhausen .... ....... ............. ............ ............ .......... 
 .. . .  . . . university of nebraska - lincoln .  . . .. . .  .. . . . . . . .
 .     .    .  .   .     .   .  .    .   .  .   .    .   .  grace .   .    .  . 
   .         .       .      .        .        .      .        .   happens .     
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From: mpaul@unlinfo.unl.edu (marxhausen paul)
Newsgroups: sci.electronics
Subject: Re: PC BOARD ETCHING QUESTIO
Date: 6 Jan 1993 13:57:25 GMT
Organization: University of Nebraska--Lincoln 
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