Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Adam Seychell 
<adam_seychell@y...> wrote:
> 
> 
> roel_cnc wrote:
> >  
> > 
> >>What type of etching solution do you use ? I assume...
> > 
> > the pcb oscillate about 10 cm 
> 
> Does it oscillate side to side movement or is it spinning ?
> 
> > 10 nozzles per side makes 20 off it 
> > volume off etch is about 25 liters 
> > i use the fe3 the brown fluid.
> 
> Is your pump a centrifugal or a diaphragm type ?
> Do you have a model number for the pump ?
> I found a company, www.flojet.com (web site seems to be down at 
> the moment). They make a large range of relatively small electric 
> diaphragm pumps. These pumps are higher pressure and low volume 
> compared to centrifuge type. You probably know that spray nozzles 
> need good pressure to work effectively.
> Did you consider using proper chemical etching nozzles ?
> What is the spray pattern on the nozzles you are using ? Fan or 
> cone type ?
> I have read that the spray pattern and the positioning of the 
> nozzles is critical for uniform etching. Did you experiment with 
> different nozzle configurations until you were happy with the 
> etching results ?
> 
> 
> > the soldermask works the same way - only after developing extra 
uv 
> > cure and after that an oven cure for 60 min at 159 C if you can 
get 
> > the same film (dynachem laminar DM)
> 
> Thanks, it seems I should try and get hold of some of this 
> soldermask. I wonder if its more expensive than photoresist.
> Here is the datasheet for the  laminar DM;
> http://www.interflux.pl/wwwpages/products/shipley/laminar-dm.pdf
> 
> I guess its not possible for soldermask to be stripped off the 
> board after it is fully cured. Methylene chloride paint stripper 
> should work, but that will kill the epoxy laminate material too.
---> why should you remove.!

some links 

www.hendor.com for pumps i use m62 6000 liters p/h
thats why i use 25 liters of etch and dont forget the anti foam 
additif or it will rise up to the sealing. :)
www.bete.com for the nozzles i use similar to the nfs12 Fan 120°
4L p/m 20x that makes a total of 4800 L p/h 
heater is a 1 kw flat wire teflon coated no url aviable yet

gr. Roel