Homebrew PCBs

thanks...

but i won't call there.. you know this is around the globe and would cost 
much more than the pen itself.
i also doubt they know which tip the pen has.

there are some pages which sell gc stuff but i didn't find any page from 
them.

thanks anyways.. i will experiment further with the plotter when i have 
time (which in the moment i don't).

stefan


On Fri, 26 Sep 2003 09:30:51 -0400, Don Perry <mojo@...> wrote:

> I have a what looks like a brand new GC catalog right here in my hand.  
> It says
> 1-800-435-2931 customer service.  A division of GC thorsen Inc.  1801 
> Morgan
> Street Rockford, IL   I don't see a web site posted on it.
>
> Stefan Trethan wrote:
>
>> i fear i can't get exactly that one, thus i am asking..
>> (not even know what gc electronics is...)
>> do they have online descriptions of products?
>>
>> st
>>
>> On Fri, 26 Sep 2003 09:16:17 -0400, Don Perry <mojo@...> wrote:
>>
>> > The pen from GC electronics Cat # 22-222 is black with 1/64 tip.  Not
>> > sure just what the tip might be, but its not metal.  They do dry out
>> > easy, so be sure to cap it when your done.  But the price was only 
>> $2.XX
>> > something each at my local store.  My plotter was $40 from the scrap
>> > yard and is a HP7475.
>> >
>> > Don Perry wrote:
>> >
>> >> I have the plotter running - slow.  And I always add angle to each 90
>> >> deg trace
>> >> in the artwork.  A short trace placed in the inside corner of each
>> >> trace.  The
>> >> angle is the shortest one that fits for the trace width. That helps
>> >> and touchup
>> >> after plotting does too.   I also sometimes keep the pcb in the
>> >> plotter after
>> >> its done, and replot after it has dried 15-20.  That CG pen I use
>> >> doesn't seem
>> >> to scrape ink off on retracing.
>> >>
>> >> Stefan Trethan wrote:
>> >>
>> >> > which tip has this pen?
>> >> > which color has the ink?
>> >> >
>> >> > maybe i really have to search this bottle of fe3cl... and then try
>> >> > different inks.
>> >> >
>> >> > The problem with using pens directly for me was that line with
>> >> varies with
>> >> > speed.
>> >> > at the corners the pen slows down and the line with increases.
>> >> > i didn'tlike this, the were small tears at both sides of each
>> >> corner.
>> >> >
>> >> > don't you have this problem with the resist pen?
>> >> >
>> >> > st
>> >> >
>> >> > On Sat, 20 Sep 2003 21:06:55 -0400, Don Perry <mojo@...>
>> >> wrote:
>> >> >
>> >> > > Here's what works for me, I use a HP 7475 pen plotter with a slot
>> >> cut in
>> >> > > the
>> >> > > case.  I use a GC #22-222 Etch Resist Ink Pen.  1/64 " tip.  Its
>> >> fitted
>> >> > > into a
>> >> > > drilled and honed out dried up HP pen.  I have to keep etching
>> >> fast. I
>> >> > > heat Fe
>> >> > > CL3 on my grill outside, in a oven dish.  Wear glasses, gloves,
>> >> and
>> >> > > apron.  I
>> >> > > use a oven baster to spray the center of the project.  The edges
>> >> seem to
>> >> > > eat
>> >> > > off first and I keep the acid going to the board center.  This is
>> >> not a
>> >> > > time to
>> >> > > walk off and come back.  I keep an eye on the board till it is
>> >> complete.
>> >> > > You
>> >> > > can always put it back in, but once its eaten the copper away its
>> >> done.
>> >> > >
>> >> > > Stefan Trethan wrote:
>> >> > >
>> >> > >> @Dave
>> >> > >> thanks for the tip with laquer thinner for solving colophony
>> >> resin.
>> >> > >> i tried it and it is much better than alcohol.
>> >> > >> The "laquer" is the same density / concentration in the whole
>> >> jar, it
>> >> > >> stays
>> >> > >> good dissolved without stirring etc.
>> >> > >> with alcohol it was always thicker at the bottom (with acetone
>> >> too).
>> >> > >> Dries quick and leaves a shiny coat.
>> >> > >>
>> >> > >> I actually tried it as a resin for etching (because the quality
>> >> is much
>> >> > >> better now).
>> >> > >> The problem is the plotter pens i have (carbide tipped) don't
>> >> leave a
>> >> > >> thick
>> >> > >> enough layer to resist HCl H2O2.
>> >> > >> I will try repeated plotting and maybe try Fe3Cl which i have
>> >> standing
>> >> > >> around somewhere (Does it decay in a sealed Bottle?).
>> >> > >>
>> >> > >> But i applied it with a piece of wire and with a piece of a 
>> paper
>> >> towel
>> >> > >> "disposeable brush with needle-nose pliers handle).
>> >> > >>
>> >> > >> And this areas resisted the etching very well.
>> >> > >> So i think the plotter pens simply make a too thin layer.
>> >> > >>
>> >> > >> any ideas? - would be great to solder the boards with resin 
>> layer
>> >> and
>> >> > >> also
>> >> > >> protection against corrosion.
>> >> > >>
>> >> > >> st
>> >> > >>
>> >> > >>
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