Homebrew PCBs

adicont2 wrote:

>I know this foamy hoses. 
>You keep the etcher and the hose in tank when you don't use it? Or you 
>wash all stuff, including hose after each sesion. I'm worry about 
>copper residues witch maybe seal those tiny holes.
>  
>
  It is a don't care item, pull it up, put on another stone for $.50, 
and toss the old one.  Not like it'd clog up that fast anyway..

>So pendulum-not perfect.
>
  Maybe in your mind, I'm pretty sure off hand it'll be about as close 
as you'll ever be able to get.

> Rotating board-not perfect. 
>Maybe togheter ;-)
>  
>
  That will be a step backwards, the center of a spinning board will be 
guaranteed less etched..

>But not now. Is a long time project. Now I will try to make something 
>common whith a simple bubbler like all comercials tanks. There is an 
>old russian proverb or a Murphy law, I don't remember: "If a thing 
>work, don't improuve it" ;-)
> 
>  
>

  Refer back to the beginning of the law, *"If a thing work.."*.  Rarely 
is someone trying to sell something like this interested in whether it 
works or not nearly as much as if they can sell it..  Even if their's 
does, it's no guarantee you'll be able to get a homemade one working as 
easily as you appear to be thinking..  Should be easy enough to get ok 
results. but also don't be too surprised if you don't, they've likely 
solved many small problems you don't yet know about to get their's to 
even work ok..

  There are also some other sayings, like don't do things the hard way.  
I haven't even built it yet, but I'd already put money on swinging the 
stone being 3 to 5 times simpler to get up and going than anything 
else.  Extremely simple idea, that already eliminates the sticking 
points from a static bubbler.  Everything else has a critical point or 
two that will be rather finiky.  You guys might not see it yet, but I 
still have all the solutions from a year ago clearly in mind, it'll be a 
breeze.  I think you'll have a lot more trouble recreating the flat hose 
type than I'll have getting the pendulum going.  Heck may go back out to 
Walmart even with the Christmas rush to get some of the small cheap 
stones, only kept the rail types from last time.

Alan