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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>