Homebrew PCBs

--- Adam Seychell <adam_seychell@...> wrote:
> I mentioned the nozzle types I'm using in one of my
> earlier replies.

I'll look back through my emails.


> What you propose sounds interesting. 

How are you planning on doing it?

> Just a quick
> warning, try not spend a lots of money on an idea in
case you end up scraping it and starting again :) 
I've leaned this the hard way.

I too, have Been there and done that. Expensive, waste
of time and frustrating.

> I think one of the most difficult tasks building a
> spray etcher is configuring the nozzles and spray
> patters so you get uniform etching. I'm sure the
> spray etching equipment manufactures spent lots on
> R+D to get this right.

Funny you say mention this. Ever since I started
thinking about building a spray etcher, I've been
preoccupied with the geometry of the spray patterns
and what nozzle configuration(s) would give optimal
results. This aspect (And the pump) are the heart of
the etcher. Everything else is nothing more than
practicalities (Enclosure and etc...). After quite a
bit of thought, I decided that R&D would be the only
way for me to figure this out unless I had access to a
high quality spray etcher that I could study. Anyway,
I've got a friend who works for Scientific Atlanta in
thier development department. They have a couple of
Bungards as well as some US manufactured machines.
These machines are of various sizes and further, I
understand at least one of the machines has heads and
nozzles that can be reconfigured on the fly (Not that
I would want to, but I'm interested in what the
different geometries are 
and why/when they are used.  He has arranged for me to
come by and take a look them (Alpharetta is a about a
20 minute ride to Norcross, which is where Scientific
Atlanta is headquartered) this week. 

I not going to begin purchasing anything (Other than
the pump I already own) until I understand the
geometry of the sray pattern(s). Once I understand the
geometry, I'll build the spray platters and prototype
the mechanics that are responsible for platter
rotation. Once I've got this down, I'll purchase the
sink, plumbing and whatever else I need. FWIW, I've
already got the interior and exterior dimensions of
the sink, so at least I can't (Well, I suppose I could
if I really f***up...) build platters and mechanics
that will not fit into the sink :) My reasoning behind
using the windshield wiper motors is that these motors
are variable speed, 12 volt,  extremely reliable, dirt
cheap ($6.00 each) and come preconfigured for perfect
180 degree motion.

Best

Marvin Dickens
Alpharetta, Georgia  USA 







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