Homebrew PCBs

Phil writes:

> I'm thinking of going to a mechanical agitator to move the board up/dn
> but have no idea if it will work well.  I figure something around 100
> hz to start with.

I'm a newbie to the group.  The last time I etched a board was perhaps
20 years ago masked with an etch-resistant pen.  I've been mostly a
software guy since then, but I'm getting back into hardware as a
hobby.  So, my appologies in advance if this is old news...

Here's a thought on agitation:  Find a gear motor that runs somewhere
arround 30 RPM.  Mount a disc perhaps 2-3 inches in diameter with an
offset center to the motor.  Mount underneath one edge of the tray.
Might something like this do the trick?

-p.