Homebrew PCBs

On Wed, 21 Jul 2004 14:54:13 +0100, Leon Heller <leon_heller@...> 
wrote:

> ----- Original Message -----
> From: "cruizzer77" <atlantis7@...>
> To: <Homebrew_PCBs@yahoogroups.com>
> Sent: Wednesday, July 21, 2004 12:30 PM
> Subject: [Homebrew_PCBs] Spray etcher
>
>
>> Hi,
>>
>> I'm currently building my own spray etcher of the rotating
>> perforated tube type. The most difficult problem is to get the fluid
>> up that tube. Does anyone know what kind of mechanism commercial
>> spray etchers like the ones from Bungard use?
>
> A peristaltic pump might work. It has the advantage that the etchant 
> doesn't
> come into contact with any moving parts.
>
> Leon
>

None of the "rotating tube" sprayers needs a additional pump,
and it would complicate it a lot (and cost a lot).
I for one am very interested in how to make it work - after all
there are small, working units out there that do work. So it is possible.
(And seems not too hard).
I have no interest now in building a sprayer, because i do not like the 
vapor
close to my tools. I'm fine with immersed vertical etching, with mechanical
agitation of the board (motor moving it side to side slowly).
But i have spent some thought about the rotating sprayers, and i am very
interested in why the particular one doesn't work at all.

ST