Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

-----Original Message-----
From: Homebrew_PCBs@yahoogroups.com
[mailto:Homebrew_PCBs@yahoogroups.com] On Behalf Of juanabba
Sent: Sunday, March 18, 2007 1:48 AM
To: Homebrew_PCBs@yahoogroups.com
Subject: [Homebrew_PCBs] Re: paint board cooper image using silk screen
- someone with experience



Hi Kevin
thanks for your answer
I was talking to the professionals down here that produce the
silkscreen mask, and I became very much sceptic whether the silk scren
mask could transfer any line below 100 mil.
They told me that the definition they have for the equipment that
produce the mask is below 200 DPI.

Is that the case at your country.???
how do you produce the mask, using professional services or DIY
method???

Juan:

Sorry for the delay.

I did my silkscreen DIY. I bought a pre-stretched screen that is 230
mesh fabric, and used chromaline procap 30 capillary film for the
emulsion on the screen. With my 400 watt metal halide lamp at 32
inches, the exposure time was about 35 minutes with an inkjet
transparency made on 3M inkjet transparency stock. I tried a laser
printer transparency, but there were way too many pinholes. The image
is then washed out and dried. I screened white solvent based glossy ink
onto the pc board and after drying, etched in CuCl. As far as how many
mils you can do, all of the signal traces on the boards that I did are
50 mil traces, separated by 50 mils in the best case, and by about 20 in
the worst case. I also did a 50 pin centronics connector that has .075"
pads with .029 holes on about a 2.3mm x 5mm grid. All the holes in the
pads showed and etched well eough to help guide the drill bit. There is
a bit of a learning curve on how much to thin the ink, but once you get
it right, screening the actual boards is really fast. If I quit being
lazy, I'll take some pics and put them on the group site. I am
confident that 20 mil traces would be possible with some practice



Kevin

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