Homebrew PCBs

Hi Chris,

Your holes are way too big. All of your air is going out a few of the 
holes because the air is taking the path of least resistance. You need 
smaller holes and probably fewer of them. You could also increase the 
air flow but that might result in  the etchant 'boiling' out of the tank.

My tank  has about 6 holes and it needs a pretty meaty aquarium pump to 
keep all of them flowing. I don't know the size of the holes but they 
are quite small.

Les

lcdpublishing wrote:
> Hi Guys,
>
> I am working on a new etching tank for Ferric Chloride.  I was using 
> two bubble stones for aquariums, one clogged pretty quickly and the 
> second one didn't last all that long.
>
> So, I figured I would take a sheet of PCB board and drill a bunch of 
> holes in it as a baffle.  The I would run an air hose through it and I 
> would have lot's of tiny bubbles coming up.  Nope, I got big bubbles 
> out of a couple of the holes.  I started out with .020" diameter 
> holes, then tried .035, then .045" and finally .055" holes. Not 
> working good at all.
>
> So, I am stumped now and am wondering what you guys are using to get 
> better distribution of your air bubbles.
>
> Chris
>