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Re: an interesting mechanical engineering problem
Original poster: Jim Lux <jimlux@xxxxxxxxxxxxx>
At 08:44 PM 1/7/2007, Tesla list wrote:
Original poster: "D.C. Cox" <resonance@xxxxxxxxxxxx>
Use thin wall tubing for the quadrants, and some sort of pin/socket
joint at the joins. I would look at using something like a lever
band clamp that clamps a split copper tube around the pin. The pin
doesn't have to be solid copper. It could be copper pipe over a
delrin core, for instance. You could even gang all the lever clamps
on a joint (3 of them) with a single actuating rod, so it's a slide
together, flip the lever, and you're done.
If you want to use flexible cables, you can get a custom wire made
pretty inexpensively that is copper braid/foil over a synthetic rope
core. 10-15 years ago, the mfr cost was about $.50/ft plus material
cost. Skin effect and all that means you don't really need the
inside of the wire, right?
Another possible source for large diameter flex cable would be
coaxial cable. It's available in sizes well up into the several
inches in diameter. There's even connectors available, but they
aren't cheap. Check out www.timesmicrowave.com (LMR-1700, for
instance is a bit over 1.5" in diameter (1.7" as it happens) and is
copper braid over foil)
1) Use 1/4 turn sections of the copper tubing and link each 1/4 turn
section together with massive copper blocks, 5 x 5 inches square x 6
inches long. Butt the primary 1/4 turn sections together and use a
lot of brass setscrews to firmly capture the 1/4 turn sections in
the brass blocks. I'm worried the resistance might become an issue
with nearly 12 "copper connectors" joining the pieces together. I
would like to use he large 4 inch copper tubing but it seems joining
them together might be a problem, and trying to haul it assembled
just will not work as the height would be too much for interstate
bridges and city streets with cross-wires, etc.
2) It's not possible to use 2-3 inch dia. copper cable as the weight
would be too high for assembly handling.
3) Perhaps use 1 inch dia copper cable and then wind 4 of these 1
inch dia. lengths in parallel to form the 3.5 turn
primary. Handling 1 inch dia. copper cable should not be too much
of a problem for a crew working with a small crane (which we will
have onsite to erect the sec coil and attach the large toroids).
With this idea, I probably would join the 4 cables together every
1/4 turn with some solid machined copper clamps to insure even
current distribution in the primary.
I know there are some great thinkers on this list and a few good
machinists, so ideas please!! We are open to consider every idea
and try to adopt the one we think will work best.
Resonance Research Corp.