--- 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