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- Newsgroups: sci.electronics
- Path: sparky!uunet!das.wang.com!wang!pvr
- From: pvr@wang.com ()
- Subject: Making PC boards using a plotter
- Organization: Wang Labs, Lowell MA, USA
- Date: Mon, 25 Jan 1993 17:45:31 GMT
- Message-ID: <C1F7zw.px@wang.com>
- Sender: news@wang.com
- Nntp-Posting-Host: preilley.wiis.wang.com
- Lines: 46
-
- I have been experimenting with using a steel tip pen on pc board
- and have had quite good results. I also got the fiber tip pens, 31HP03K-2,
- that were mentioned. These work fine as far as the resist characteristic
- goes. They are not so good on line with. They take about a half
- inch to start drawing properly, this with only 30 seconds of uncapped
- time before plotting.
-
- The ink that I use in my steel pens is Staedtler 748 PLP red.
- Before you run out and order it, it has been discontinued. Not
- that they don't make it anymore, they don't import it anymore.
- Their technical person told me that EPA labeling rules dictated
- a warning label and they only sold $5000 worth of the stuff a year
- so they stopped shipping it over. It is the ink used in the
- 31HP03K-2 pens that were mentioned.
-
- I use a Staedtler 757-PL2-CS pen tip. This is a .25 mm, cross
- groved, tungsten carbide tip pen. It produces consistant width
- lines that have a consistent coating of ink. I also tried a
- ordinary steel tip disposable pen. These come with the pen
- tip not inserted into the ink cartridge. I punched the membrane
- out and dumped the original ink out and refilled it with the
- ink mentioned above. This worked just as good as the tungsten
- pen tip and only cost $10 for the pen verses $50 for the tungsten
- tip pen and adapter. The drawback is that after the ink runs out
- of the steel pen you cannot refill it. The tungsten pen is refillable
- and disassemblable for cleaning.
-
- I get the best results if the lines are drawn twice. I do this
- by specifying the pen width as slightly smaller that the trace width.
- This causes the cad package to believe that it has to trace the lines
- twice to get the proper width. The second pass is slightly offset
- from the first. I use 1 cm/sec plotting speed.
-
- I bought my bottle of ink at Charrette in Woburn, Mass. just a couple
- of weeks ago. When I went back last monday they had none and
- it was not listed in their new catalog. It is also not listed
- in the new Staedtler catalog. It must have just been discontinued.
- There may be other supply places that have left over stock. I have
- one bottle so I am OK for a while. If someone finds some I would like
- to get a couple of extra bottles for reserve.
-
-
-
- --
- -->>>>>>>>>> Peter Reilley ..... pvr@wiis.wang.com ..... KA1LAT <<<<<<<<<<<--
- Well, that about says it.
-