On Friday 17 November 2006 11:32, Leon Heller wrote:
> ----- Original Message -----
> From: "Christopher Hart" <kc8ufv@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Friday, November 17, 2006 2:23 PM
> Subject: Re: [Homebrew_PCBs] Ultrasonic etching tank?
>
> > Sometimes I will use one on small boards. I place the board and etchant
> > in a
> > small glass/ceramic container, put some water in the cleaner, then set
> > the container in that. The one that I use also has a heating element, I
> > use Ferric Chloride etchant (yes, the ugly brown stuff that stains
> > everything),
> > and the boards are usually done in about 2 minutes. With this same
> > etchant,
> > with the boards just sitting there (as I must do for larger boards) it
> > takes
> > about 1/2 an hour to 45 min per double sided board. (currently all my raw
> > board, except the paper thin stuff is double sided.)
>
> Why not use continous agitation for the larger boards by rocking the
> container? They will only take about 10 minutes.
That would require me watching the boards constantly. I frequently have many
projects going at once, and I just work on another while waiting for the
boards to etch.