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- Path: sparky!uunet!zaphod.mps.ohio-state.edu!moe.ksu.ksu.edu!crcnis1.unl.edu!unlinfo!mpaul
- 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
- Lines: 27
- Distribution: world
- Message-ID: <1ieog5INNhdn@crcnis1.unl.edu>
- References: <13047.3029.uupcb@factory.com>
- NNTP-Posting-Host: unlinfo.unl.edu
-
- 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 .
-