Homebrew PCBs

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
>