Hi Mr. Wedemeyer,
You wrote: ""I use a vertical tank (TupperWare Cereal container).
Anyone wants a photo of it let me know.""
Can you post that photo to the forum.
Best regards.
Alper YILDIRIM
--- In Homebrew_PCBs@y..., Hans Wedemeyer <hans@c...> wrote:
> I've been using the same Ferric Chloride for years and years... I
use a
> vertical tank (TupperWare Cereal container). Anyone wants a photo
of it
> let me know.
> Drill two holes in the board and thread some 24AWG plastic coated
wire
> through the holes, then suspend it in the tank. I usually end up
> agitating the board by lifting it out of and dropping it back in
the FC.
> There is still a tendency to etch faster at the top of the board,
but
> the difference is only about 2 minutes.
> Etching time is still 10-12 minutes and has not changed since I
> purchased the stuff at rat shack some years ago... 1995 I think it
> was... I still have the original bottles somewhere...
> The level is going down and last tiem I ecthed a 5" X 6" board I
needed
> to add some FC, as I did not have any, I simply added 1/2 pint of
> water....
> There is a crusty ring around the top of the FC and sometimes a
coating
> develops on the surface ( temperature dependent I think) anyway
that
> goes away by simply heating the entire Tupperware container in a
hot
> water bath and stirring for 1-2 minutes.
> IMHO people that keep using new mixture of FC are wasting time and
> money.
> Just how I do things.
> COS (change of subject) for those interested I posted a photo of
how I
> rivet Harwin via pins
> http://hans-w.com/pcb_harwin_rivets.jpg
> The four pads at the lower right are half of an SO8, should help to
> gauge size.
>
> Hans Wedemeyer
>
>
> Steve Greenfield wrote:
>
> >
> > Yep, biggest problem I've had with etching in a flat pan is that
no
> > matter what you use or how hot you get it, etched copper and used
> > acid builds up in a layer and slows the etching process. Minor
> > swishing back and forth just means that the edges etch but not
the
> > center.
> >
> > So no matter what I use, I want to use a vertical tank, probably
> > with a bubbler to keep it moving.
> >
> > Steve Greenfield
> >
> > PS I love this list!
> >
> >
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