Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Adam Seychell <a_seychell@y...> 
wrote:
> I've never tried electroetching, but I'm curious what the etch 
> uniformity is like for a simple (homebrew style) electroetching 
setup ? 

This idea has been sticking in my mind as well.. The lack of lateral 
forces (I assume) makes it attractive for low cost CNC. 

As to the uniformity, it pops into my mind that low voltage, high 
amperage would result in a very short, but powerful spark which would 
only remove the copper very close to the electrode. A higher voltage 
spark would jump farther and potentially vary more. That is not based 
in experience, but just an educated guess.

I'm trying to hint for a small welder to show up under the christmas 
tree at the end of the year, but I wonder what I could experiment
with 
before that on a very limited buget. Any suggestions? Old car
battery? 
I could use a car battery charger... Wonder if I could kill my 
alternator by playing about with the jumper cables? <GRIN>