Homebrew PCBs

I found a heated pin produces pretty large holes and, thus, pretty
large bubbles.  I used a #69 drill bit to get much smaller holes but
would prefer even smaller.

Also, be careful of the material you use.  CuCl attacks a lot of
different plastics.  I've had the best luck with HDPE.

--- In Homebrew_PCBs@yahoogroups.com, "Stefan Trethan"
<stefan_trethan@g...> wrote:
> 
> On Tue, 07 Dec 2004 16:11:50 +0000, Les Newell <lesnewell@f...>  
> wrote:
> 
> >
> > Hi Stefan,
> >
> > You can make holes in a plastic tube but they need to be very small. I
> > used a small pin that I heated up with a candle flame. If you use the
> > pin cold the hole tends to seal up as soon as you remove the pin. You
> > don't need many holes. If I remember correctly my system worked best
> > with about 5 holes in a 180mm length of pipe. I am working from memory
> > here becaIuse my tank now has the holes built in.
> >
> > You need a pump with a reasonable flow rate if you go this route
> > otherwise you may find that air only comes out of one half of the
tube.
> >
> 
> Ok, i'll experiment with poking holes in a hose then.
> I thought maybe it is best to make the hose a U-shape, so i can feed
both  
> sides.
> I can get a second pump if required, the one i have says 110 l/h.
> 
> Well, i'll try for hole-size, and how many holes the pump will
supply at  
> the given depth.
> 
> ST