Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, Adam Seychell 
<adam_seychell@y...> wrote:
> 
> 
> roel_cnc wrote:
> > i already use dry film - spray etch and cnc drilling and works 
for 
> > several years now .
> > 
> 
> How do you apply the dry film ?
not with (boiling)water - it wolnd be a dry film anymore :)
I used in the past a aloy plate aprox. 30 mm thick and build a heater 
from a washing machine:) in, and a thermo unit from an oven to 
control temp.(+/-100 C.)
clean the board putt the film on and lay it on the heated element-
instant roll with a soft one over it pressing hard off cause.
i still use this for the soldermask dry film part

the resist (new way) i use this moment parts from an big copier 
silicon roll with heater inside - works awesome.

remember there are 2 sorts off film the resist and soldermask ive got 
from both 2 rolls 25 meters eatch as samples :)
   
 
>   I have been applying dry film with a wetted hand roller, see:
> http://groups.yahoo.com/group/Homebrew_PCBs/message/2709
> 
> 
> And I'm really interested how you managed to get a spray 
> etching machine for home use, and would also be curious in 
> the concept of its design. ? I am in the process of 
> designing my own.

the spray etcher i build has on both sides a ring off pvc pipe (used 
as air-pressure tube in factory's) with nozzles from a carwash unit.
just washing your car sometimes with the right wrench :) wil do.
same unit for development but cheaper pump

the pump is the most expensive part off all  got some docs somewere 
around - and dont forget a real pump use atleast 1 to 1,5hp motor  

but i still love my bubble etcher the best there is fast and always 
perfect for single runs

please excuse me english
greatings from holland  
  
Roel 
> 
> Adam