--- In
Homebrew_PCBs@yahoogroups.com, Brian Goralczyk <bdg0584@...> wrote:
>
> I believe I can explain it. The agitation of the etchant would
> spead up the process, however what is actually causing the agitation
> is the edges of the board being moved through it. By the time the
> energy gets to the middle of the board it has dispersed. It would
> seem to me, that maybe what would work better is a bar that would
> move back and forth through the etchant right below the surface of
> the board. But that is just speculation, and I believe you would
> want to minimize the verticle movement of the agitating platform.
> Maybe you could place to rails above the etchant that the agitator
> bar would be connected to and move along. I see a rather simple
> setup in my head.
Many years ago (10? 15?) when I used to do a lot more board building,
I had bought a low-cost etch tank that used a pump to move the etchant
over a ramp of sorts, where the pcb was placed. It worked quite well
as I remember. I suppose this would be called a wave etch tank. I
tried to search for this type of tank with no luck. Does someone
still make these?
Also, someone asked about the laminated copper foil I sell. The
website is
http://www.laserpcb.com