In article <1fb58$44872769$438c8034$27266@xxxxxxxxxx>, Jamesthompson2002
> "James Beck" <jim@xxxxxxxxxxxxxxxxxxxxxxx> wrote in message
> > In article <2464a$4485ebef$438c8034$9639@xxxxxxxxxx>, Jamesthompson2002
> > @hotmail.com says...
> >> I came up with probably an old scheme but simple enough to circulate
> >> etchant
> >> in a pcb tank.
> >> Start with a plastic soda cap, snip the edges of it to make fins. Then
> >> use
> >> silicone sealant to glue a small magnet inside the cap. Cap sits on
> >> bottom
> >> of tank, then.
> >> Affix another magnet to the shaft of a small dc motor mounted in a
> >> standoff
> >> base for your tank and directly under the cap. As motor spins, so does
> >> cap
> >> and etching solution. Simple enough you think?
> > I used an aquarium air pump and a bubble wand to keep things moving back
> > in the day.
> > Jim
> Yes, the bubble wand is ok but it also causes a mist to rise from the tank.
> I knew of the chemistry lab stir and it is what I wanted to duplicate for a
> DIY etchant tank stir, to eliminate as much misting of etchant as possible.
> I'm just doing a small tank as of now to see how well it works out. I have
> seen a few post talking about a pump for the etchant tanks and wanted to
> share my approach to it. JTT...
Two things, if you are losing that much etchant from misting, you have
the air volume WAYYYYY to high and 2ndly cover the tank.