Homebrew PCBs

I'm thinking of going to a mechanical agitator to move the board up/dn
but have no idea if it will work well.  I figure something around 100
hz to start with.

--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@g...> wrote:
> On Wed, 09 Mar 2005 21:37:25 -0000, Phil <phil1960us@y...> wrote:
> 
> >
> > One I had was a blue tube say 2 cm diameter and 3-4 cm long. It felt
> > hard but brittle.  I thought it was some sort of foamed glass but when
> > it fell apart it was clearly some sort of plastic.  It turned white.
> > I still have some bits of it floating in my etchant...
> > The other one was grey and some what like foam.  definitely plastic of
> > some sort.  It lasted only slightly longer.
> > Do you need bubbles or agitation?  These days I just let the end of
> > the air hose dangle in the etchant and the pressure causes it to go
> > back and forth giving me enough stirring so the etch is reasonably
even.
> > Phil
> 
> 
> Damn, and thank you for that post.
> I almost bought one of the hard/brittle variety just now.
> (two of 3 ebay sellers have relpied within 5 minutes, one is as we
talk  
> the hard and brittle variety and the other doesn't know the
material, but  
> it is a flexible porous hose so plastic.)
> 
> I really thought the hard/brittle type would work and i'm done with
it....
> Back to the drawing board then.
> 
> I want the air to mix the etchant, but also to help agitate the
etchant  
> right at the board, now i see much faster etching in the streaks
where the  
> bubbles rise.
> 
> 
> ST