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- Path: sparky!uunet!cs.utexas.edu!ut-emx!ccwf.cc.utexas.edu!wdlee
- From: david@moe.ece.utexas.edu (david lee)
- Newsgroups: sci.electronics
- Subject: Resist Pens in Plotters
- Message-ID: <78433@ut-emx.uucp>
- Date: 26 Aug 92 16:20:36 GMT
- Sender: news@ut-emx.uucp
- Reply-To: david@moe.ece.utexas.edu (david lee)
- Organization: The University of Texas
- Lines: 35
-
- Netfolks:
- I have been using permanent markers in my plotter, writing directly
- onto copper pc boards, trying to circumvent the photo-lithographic steps.
- This is what I hope to do:
-
- 1. Draw the circuit patterns with my favorite software.
- 2. plot the pattern on paper.
- 3. Tape a copper clad pc board (no photoresist) over the patterns
- on the paper.
- 4. replace the plotter pens for paper with a waterproof permanent marker.
- 5. replot the circuit patterns on the copper.
- 6. Bake (until done :-) the board at about 60 C for an hour or so
- just to ensure that the ink is "good 'n dry".
- 7. toss the board in the etching tank.
- 8. wash/dry/drill/solder/be happy.
-
- Here's the problem. It's not working. I am using the following pen:
- The Ultra Fine Point Sharpie (R) by Sanford(R) (color = black).
- Well, by the time the copper is etched, the ink is starting to dissolve as
- well. This leads to pits, breaks etc. The resist pen from Radio Shack
- however is holding up quite well on the same board.
- So, why don't I just put the Radio Shack Pen in my plotter?
- Because the tip on the Radio Shack Pen does not yield nice, fine traces.
- (I need to run a trace between the pads on an IC, for example.)
- So, Do you know of a fine tip pen whose ink is as robust as the typical
- resist pen?
-
- Best Regards,
- please reply directly to
-
- david@moe.ece.utexas.edu
-
- and I will summarize for the net.
-
-
-