Homebrew PCBs

About conical nozzles not having an uniform etch, Im not sure how much this is a problem, Bungard uses it on their splash center/xl machines and they claim a 100 microns (4mils) resolution. Just see the video.
However full cone nozzles are not the same as the one used on the instructables, those produce a mist and a serious cone should produce a much greather particle size.

Cunningfellow, Im looking foward to see your writeup!


--- In Homebrew_PCBs@yahoogroups.com, "cunningfellow" <andrewm1973@...> wrote:
>
> 
> 
> > David wrote:
> >
> > Hi All,
> > 
> > Has anyone tried making this?
> > 
> > http://www.instructables.com/id/Printed-Circuit-Board-PCB-Sprayer-Machine/?ALLSTEPS
> > 
> > It looks very interesting!!
> >
> 
> I would advise against it.
> 
> Acrylic is not suitable material with CuCl.
> (PE,PP, PVC are all OK)
> 
> Conical spray nozzles wont get a uniform etch.
> 
> The high pressure pump is pressure relived AFTER
> going outside the tank with tiny little flimsy
> connectors.
> 
> See
> 
> http://www.prototrains.com/etch2/etch2.html
> 
> Where his spray etcher had an accident with large
> barbed fittings and hose clamps.
> 
> and imagine how much fun it would be to have that
> image at 3 min 21 sec into the video on the
> OUTSIDE of the tank.
> 
> If you are going to spend 100s of $ on building
> one, follow Adams build.  You will get good
> results with the fan nozzles and motorised PCB.
> 
> If you only want small boards and spending $40
> sounds like more fun, just be patient.  I am
> working on my write up.
>