I know this foamy hoses.
You keep the etcher and the hose in tank when you don't use it? Or you
wash all stuff, including hose after each sesion. I'm worry about
copper residues witch maybe seal those tiny holes.
So pendulum-not perfect. Rotating board-not perfect.
Maybe togheter ;-)
But not now. Is a long time project. Now I will try to make something
common whith a simple bubbler like all comercials tanks. There is an
old russian proverb or a Murphy law, I don't remember: "If a thing
work, don't improuve it" ;-)
Adrian
--- In
Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@g...> wrote:
>
> On Fri, 23 Dec 2005 15:47:42 +0100, adicont2 <adicont2@y...> wrote:
>
> > Yes if we solve the pump corosion problem.
>
> A diaphragm pump can be used and doesn't corrode. I'm not sure
which,
> either shurflow or flojet was recommended, look in the archives. But
they
> are not cheap. (They are usually used for water supply in camping
vans and
> stuff).
>
>
> > "I'm not gonna try that any time soon, since my setup is just too
> >
> > simple and too well working to change.
> >
> >
> > Tell me Stefan, you use a homemade tube or a comercialy one like
those
> >
> > make it for aquariums, or a long stone?
>
> I use a aquarium flexible hose. It is made of some foamy material
and has
> two rows of very small punctures.
> The homemade tube didn't work well (streaks).
>
> >
> >
> > "duh if a stone is too uneven sitting there then move it"
> >
> >
> > Is perfect true. Moving the bubbler or the board orizontaly is
much
> >
> > better. But this don't solve the problem of differences between
top
> >
> > and bottom of the board.
>
>
> I don't think this problem can be solved entirely in a vertical
immersion
> etcher, well, maybe with the brushes....
> Even rotating it will not entirely solve it since the middle is
always in
> the middle. (It is kind of the microwave i have here that has a
"cold
> spot" exactly in the center. A bloody rotating plate is no help
whatsoever
> if there's a cold spot in the center!)
>
> Even with spray etchers this is an issue, a industrial conveyor
sprayer
> will show different speeds between the leading edge and the rest of
the
> board, because a puddle builds up. On top side that is.
>
>
>
> ST
>