No but i have thought about using magnetic stirrers.
One could even attach a brush to an encapsulated magnet, and
mechanically brush the pcb inside the tank.
No need to build a complicated drive system with coils either, just
stick a magnet to a disk rotating outside the glass, motor driven.
ST
On Fri, Apr 25, 2008 at 12:13 PM, Adam Seychell <a_seychell@...> wrote:
>
> I was looking at an easier and more reliable way to etch PCBs. I know
> from experience that bubble etching never produces acceptable uniformity
> and often needs manual brushing to finish it off.
>
> I though maybe the bubbles could be released on one side of the tank
> causing etchant to flow in a circular path around the tank.
> The PCB is held vertically in a frame that pivots by two small shafts at
> either side. The moving fluid should continuously rotate the PCB around
> thus guaranteeing uniform concentrical etching. I'm not sure how uniform
> the etch rate would be radially.
>
> Has anyone tried making such a contraption ?
>
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