twb8899 wrote:
>
>
> --- In Homebrew_PCBs@yahoogroups.com
> <mailto:Homebrew_PCBs%40yahoogroups.com>, Adam Seychell <a_seychell@...>
> wrote:
> >
> >
> > Hi,
> > I've uploaded some pictures of my new spray etching machine. Its not
> > finished yet, as I've still to work out the precise nozzle
> configuration
> > on the spray arm.
> > This is a project which has gone through many revisions over the past
> > few years, and has taken a lot more of my time than I originally
> > anticipated :) If people are interested I'll write up a web page with
> > the details when I get free time.
> >
> > http://members.optusnet.com.au/~eseychell/pictures/spraymachine
> <http://members.optusnet.com.au/~eseychell/pictures/spraymachine>
> >
> > Adam
> >
>
> Adam,
>
> That etching machine looks great. You do nice work.
>
> I have always felt that spray etching is the way to go. My spray
> etcher will etch 1 oz. copper in 3 minutes with fresh etchant and
> about 5 minutes when it's almost used up. This is with ferric chloride
> at 110 degrees F.
>
> Keep us informed on your progress. Thanks for sharing the information.
>
> Tom
Tom, thanks for the reply. I agree spray etching gives the best results,
but thats not the real reason for pursuing a project like this. At the
end of the day its all just a hobby. Those pictures are of my new
machine which is a total revamp of my previous machine. I was getting
35um etches in about 7 minutes at 20°C (70°F) with good uniformity using
air regenerated cupric chloride at ambient temperatures. It had some
design issues with the lid, leaks and corrosion that made me build a new
one.
Adam