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