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Re: an interesting mechanical engineering problem

Original poster: "Mark Broker" <mbroker@xxxxxxxxxxxxxxxx>


Why not roll some bar stock and use bolted connections?

When I used to work at P&H Mining, "we" used to send 16 foot diameter ring-planetary gears out on flatbed trucks tilted to a ~45 degree angle. (I'd not want to be the driver of a truck with a ~10 ton slug of steel with a CG about 8 feet off the pavement, though.) I know I have a picture of it on my computer. . . .

Mark Broker

On Sun, 07 Jan 2007 22:44:26 -0600, Tesla list <tesla@xxxxxxxxxx> wrote:

Original poster: "D.C. Cox" <resonance@xxxxxxxxxxxx>

I'm presently in the process of designing the "world's largest
portable Tesla transformer".  It will be a 60 ft tall unit x 7 ft.
dia sec coil, running as a DRSSTC,  160 kW continuous input, crowned
with a 8 ft dia. toroid and above that, a 20 ft dia toroid.  Our
present design target, using 24 pcs of PowerEx 2400 Amp, 1700 Volt
IGBTs, all carefully linked together in a low inductance
configuration, with 3 inch wide x 1/4 inch thick copper plate
(H-bridge with 6 of these massive IGBTs on each corner).
Planned buss voltage is 800 VDC.  Solid state control of the 440
Volt, 3 phase, 400 Amp inputs with very large SCRs --- similar to the
smaller control system we are developing for our dual MOT coil with 7
- 7.5 ft long sparks running off a 120 VAC circuit.

Pri cap, with res. freq of 10 kHz, works out to 6 uF, 10 kV Maxwell
pulse cap, with a 3.1 turn pri (thanks again to Bart's great JAVATC program).

The base will be 26 ft in dia. and can be disassembled for
transport.  The sec coil is going to have the winding, 31,000 ft of #
6 AWG wire, glassed inside after winding.  This unit is 7 ft in dia
and 44 ft long, but still transportable on a lowboy truck.

The primary is 3.1 turns, tapped, with a total of 3.5 turns.  Our
original design was to use 4 inch copper tubing to form the pri, but
this is where the problem is coming into play.  If we build a 26 ft
dia coil, 3 turns, of 4 inch dia copper tubing, how do we disassemble
the beast for transport.?