Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "juanabba" <jjose@...> wrote:
>
> --- In Homebrew_PCBs@yahoogroups.com, "Kevin Urbom" <urbomb@> wrote:
> >
> >  
> > 
> > -----Original Message-----
> > From: Homebrew_PCBs@...m
> > [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
> hi Kevin
> Thanks a lot for the comprehensive answer.
> I am trying to get the elements down here ( or finding a local
> replacement ) so I can try out your method.
> 
> The doubt I have at this moment is the ink you use to silk screen the
> cooper after producing your mask.
> You mention  "white solvent based glossy ink"), is that the correct
> spec????
> But  before I understood  you use either 
> a>	    fuji (sericol) quick dry enamel ink
> or
> b>	   Nazdar ink would be fine to
> 
> can you pls clarify this.??
> 
> Thanks  again, you are being extremely helpful
> 
> best regards
> juan
> 
hi Kevin
sorry for coming back to question
can you pls look at my last question above
best regards and thanks again
juan


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