Homebrew PCBs

Are you folks aware of this site and it's detailed instructions to  
make and use a spray tank etcher ???


http://www.prototrains.com/etch1/etch1.html
http://www.prototrains.com/etch2/etch2.html

http://www.prototrains.com/

http://www.prototrains.com/etchmisc/overhead.pdf

Best to ya,
Mike Bauers
Milwaukee, Wi

On Apr 27, 2008, at 4:50 AM, Stefan Trethan wrote:

> I'd say it would probably work in a vertical tank, but moving the PCB
> would add complexity to the holder.
>
> Uniformity is rotten in my tank too, especially since some of the
> holes in the bubbler hose seem to deteriorate over time leaving a few
> powerful streaks of bubbles. I'm sure it takes as much time again to
> complete the board as it takes to etch the first few spots bare, if
> not more. That sounds awful, but with the stuff i do (usually no
> smaller than 8mil) it doesn't seem to be a problem.
>
> If there is a way to improve it, without too much fiddling about, i'd
> surely impement it. I was thinking about replacing the hose with a
> artificial stone type bubbler. Those seem to give better uniformity.
>
> ST
>
>
> On 4/27/08, Adam Seychell <a_seychell@...> wrote:
>
>>
>> Interesting. I wonder if this concept could be made to work in a
>> vertical tank. The PCB could be mounted to an plastic shaft that is
>> attached to some cam assembly at moderate speed. The circular
>> displacement might only be several mm , but the agitation could  
>> prove to
>> be uniform and vigorous. I assume any mechanical method would add a  
>> lot
>> of complexity, machining up bushes, wheels, brackets, et.
>>
>>
>> A cover plate is mandatory for bubble agitation since splashes go all
>> over the place otherwise. I found the cover plate also needs to  
>> have a
>> neat fit and recessed slightly so run off goes back into the bulk  
>> solution.