Homebrew PCBs

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\ufffdC (70\ufffdF) 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