Archive of the former Yahoo!Groups mailing list: Homebrew PCBs

--- In Homebrew_PCBs@yahoogroups.com, "soffee83" <soffee83@y...>wrote:

I thought about
> making a plexi rectangle with some type of standoffs to create a
> vented chamber in the bottom of the tank, and gluing my tubes
through
> the tank's sides near the bottom, but figured it might be a hassle
> while filling the tank and waiting for the etchant to fill the
chamber
> (or having the air try to lift it out).

I see a comercial tank made it in this way, whith very short
standoffs, so a little chamber. Gluing the tubes through the tank's
sides near the bottom is not a good ideea. When you stop the pump, the
solution goes in it. The tubes must be verticaly and goes out from
tank at the solution sourface level.


--- In Homebrew_PCBs@yahoogroups.com, Alan King <alan@n...> wrote:

Think of a hose going down an arm,
> and then out an inch or two under the board. A pendulum going back
and
> forth under the board. Linearize the swing and you would get almost
> guaranteed even etching, and it should be much easier to make and
use
> than trying to get any long tube with holes along it to work evenly.

> Flood of bubbles and then a short time of contact to etch, I bet it
> wouldn't even be that much slower than a tank full of bubbles.
>

> Alan
>

Any kind of mouvement is certain a good ideea.
I think there is much easy to mouve the board orizontaly.
A rotary movement is ideal, because in this way, you can etch even the
bottom and the top of the board. But you need a bigger tank for this.
I think about a suction cup in center of the board conected in some
way to an outside little motor.


Adrian




Adrian