Homebrew PCBs

On Sat, 12 Mar 2005 13:00:28 -0000, Leon Heller  
<leon.heller@...> wrote:

>
> It'll dissolve the Al content, I would think. The Vanadium should be OK.
> Leon


So no good?
I don't think missing 6% of the shaft would be acceptable (as the shaft  
should stay smooth for good bearing action).

Do you guys think it will be ok to have a 6 to 10mm titanium shaft (I'll  
polish it) running in teflon at that rpm?
Higher tube diameter means same pressure with lower RPM, right? I'd have  
some sewage tubes (50 or 60mm) which i could use.
Matching the motor is not a problem (might use a pulley and belt if i find  
something suitable to have the motor in a box at the side or direct  
drive/straight with hose as coupler).

I haven't worked with titanium or teflon before so i will see.. wonder if  
teflon can be drilled with standard tools...
What bending strength has titanium? aluminum-like?

I'm hoping to balance the rotor like a aircraft prop, but it will not  
reflect the weight when wet so it must still be good precision work. Oh  
well, the proof of concept worked ok with no care...

wondering if i must make some sort of "sump" in the etcher, to provide  
enough depth for the tube to suck in etchant (it makes a vortex that  
drives it out), i don't want to have more than 2 liters or so in the  
etcher.

The mechanical setup seems not too difficult (just a reliability issue)  
seeing the bucket approach works, the hard part will be the  
nozzles/uniformity so i must select a tubing where i have/get enough and  
figure out a way to attach endcaps with little fuss.

I don't like the idea of commercial nozzles, as it seem expensive, and too  
big for the device. Also, it isn't sure nozzles meant for static  
application will create a fan pattern when rotating.

I decided to go for a single sraying tube and only one sided application  
for now. It will be hard enough this way, and i hope i don't regret that  
limitation later. Oh well, the first version is never perfect anyway...

ST