Homebrew PCBs

>Hi,
>
>I'm currently building my own spray etcher of the rotating 
>perforated tube type. The most difficult problem is to get the fluid 
>up that tube. Does anyone know what kind of mechanism commercial 
>spray etchers like the ones from Bungard use?
>
>Regards
>Martin

The one I have is having a small plate that basically would "close"
the tube but this plate is having three holes in it. Can't tell from
memory wehter these are just holes or if they are drilled with an
angle to form some sort of propeller as Stefan sugested. 

IMHO it's not too important as long as some fluid can get in. The
plate moreover seems to serve as a way to even limitt the amount of
fluid that otherwise would go up the tube. The problem here is that
yuo need a surprisingly powerfull motor to drive the tube and I can
imagine that having no plate there would simply make the tube rotate
less quickly leading to a less intense spray effect. These are just
speculations on my end. I never did eny experimenting yet.

Markus