Homebrew PCBs

Yes, but that happens anyway. You'll only be etching out a narrow
channel to start with, so I can't see it being any more of a
problem than etching the "normal" way.

Steve Greenfield

--- Henrik Olsson <henrik-olsson@...> wrote:
> Denny, list,
> Interesting idea, but.....
> If you do scratch thru the coating and into the copper there will
> be a big
> chance of under-etching. That is when the acid starts to etch in
> and under
> the protective coating thus making the traces a lot thinner than
> they should
> be.
>     /Henrik Olsson.
> 
> ----- Original Message -----
> From: <milwiron@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, April 05, 2002 6:46 PM
> Subject: Re: [Homebrew_PCBs] Scratch and Etch
> 
> 
> >
> > I'm finding John's idea pretty intriguing.
> > Just to take the brainstorming another step:
> > One big problem with PCB routers is tool life and their cost.
> > But using a CNC router with a cutter to just cut through the
> surface of
> the
> > resist and a thou or two in to the copper would prolong the
> life of a
> > carbide tool immensely... and produce a board that should etch
> quickly and
> > cleanly.
> > Yes it would be better do away with etching all together but a
> marriage of
> > the two technologies for some applications could be useful.
> > Denny
> >
> >
> > At 02:35 PM 04/05/2002 -0000, you wrote:
> > >Hi,
> > >   Nobody liked my light on a plotter idea. I was told the
> > >light source would have to move too slow. The board would take
> > >way to long. Ok, I use Mechanical Etching bits myself. But
> what
> > >if you coated the whole board with resist. Then you put a
> sharp
> > >point in the plotter. Have the plotter do isolation paths.
> Then
> > >the board goes to the acid.
> > >
> > >                                          John
> > >
> > >
> > >
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> > >
> > >
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> > >
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> >
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> >
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=====
Steve Greenfield               // Digital photo scanning, retouching,
Polymorph Digital Photography // and photomorphing to your specs.
253/318-2473 voice           // We use the best little computer in
polymorph@...     // the world, the Amiga!
http://www.polyphoto.com/  // Based in Tacoma, WA, USA

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