In article ,
David Billington wrote:

Joseph Gwinn wrote:

[snip]

The MagnaBend patent (4,111,027) gives some coil data in Column 5 Lines
5-12:

"A specific construction of the above described tool had a length of 600
mm, a weight of 20 kg. (not including keepers), a coil formed from 22
guage copper wire and weighing 2.4 kg., operated on a 240 volt, single
phase, 50 cycles per second AC supply and consumed, intermittently, 4
amps. That specific construction was able to exert a holding force on
sheet metal of about 4 tonnes. "

Apparently, the Australians used AWG (American Wire Gauge) sizes for
copper back then, and probably have gone over to IEC metric wire sizes.
In any event, #22 AWG wire with single build (thickness) insulation is
1.972 pounds per 1000 feet, and 2.4 Kg is (2.4)(2.2)= 5.28 pounds of
wire, which would be 2,677 feet of #22 wire. The brake is 600mm wide,
which is 600/25.4= 23.62" wide, call it 24" or 2 feet. A turn is
therefore 4 feet, so 2677/4= 669.4 turns, call it 670 turns.

Can you be certain the Australians were using AWG and not SWG, it makes
a difference. Their video mentions it bending "16 gauge" and their
specifications mention 16g/1.6mm which would indicate SWG is in use at
least for the metal specs, US metal gauges are thinner for the same number.

SWG is for sheet steel, while AWG is for copper wire.

I did google around a lot, and all indications I found were that they
really did mean American Wire Gauge, although I would have guessed that
they would use BSG (British WG). The difference between AWG and BWG
isn't large. But I feared that AWG really meant Australian WG.
Actually, I was surprised to see wire gauge listed, versus diameter in
millimeters.

If anyone from the Land of OZ is listening, please chime in.

Joe Gwinn