Here it is..
http://hans-w.com/crusty_2.jpghansw
yildirimalper wrote:
> 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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