On Sep 2, 2009, at 7:12 PM, Kyle Mcallister wrote:
V, and Stephen and Horace in particular...
Okay. The following experiment was performed.
Took my two trusty bearings from the working BB motor. Left the U
bolts attached to the outer races. Fine.
Took a length of 5/8" smooth steel shaft, cut two pieces 2" long
from that. One piece was clamped in a vice, with one terminal of my
"terrible transformer" secondary connected to that. The other 2"
shaft was connected to the other secondary terminal. Touch them
together when power is applied, get nice sparks and a lot of heat.
Fine.
I made an extremely precision balanced and electrically optimized
rotor as per Stephen Lawrence's prescription, carefully machining
a... alright, you got me. I wound a length of bare solid 14AWG
copper wire around the threaded studs of the U bolts connected
around the bearing outer races, connecting both bearing assemblies
together, and just bent and adjusted the copper wires until the
thing was quite rigid. It looks...really good.
The now solid (it actually is quite rigid) two bearing assembly was
placed with the first bearing over the vice-clamped shaft. The
second shaft was placed in the second bearing. I held it in my
hand, manually keeping a 1/4" gap between the inner shaft faces. I
compensated (by hand) the spacing and shaft angle, bent copper
wires here and there, until it spun 'freely'. It ain't balanced
worth a damn.
Power was applied by help of my dear wife. I then gave the bearings/
U-bolt/copper wire assembly a spin. A nice torque was produced, and
it accelerated. Peaked at maybe 100-150 RPM.
No, I am not kidding. This piece of junk I put together in maybe 15
minutes does work. Just to clarify, Stephen, that we are on the
same page.......
Current flow is as follows: in from supply through stationary shaft
A, into bearing 1 inner race, through the balls, out through outer
race.... then through copper wires rigidly connecting both outer
races to bearing 2 outer race, in through balls, then to bearing 2
inner race, and out to stationary shaft B and to other end of supply.
Shafts A and B are electrically isolated, but held mechanically rigid.
Bearing 1 and 2 outer races are electrically AND rigidly
mechanically connected.
Good? No? Indifferent?
Anybody want to see a video of this sorry-assed thing?
--Kyle
I say bravo Kyle! I would certainly like to see it. A picture is
worth a lot of words and a video is worth even more. 8^) There is
nothing like good experiment!
Best regards,
Horace Heffner
http://www.mtaonline.net/~hheffner/
