Original poster: "seanick" <edgarsbat@xxxxxxxxxxx>
I actually use a "Quick-Grip Keyless Bushing" that I ordered from
E-Bay, but they have on page 964 of McMaster-Carr's catalog about
halfway down the page. There was a discussion about them recently
("Tran-Torque GT") that prompted me to check them out and acquire
one. Must say that it works quite well to press the rotor against
the 1/2" axle (which I did acquire from McMaster-Carr) and a lot
more uniform connection than I ever had on any of my previous gaps.
Helps that my rotor was made on a CNC machine by a friend of mine too though.
However I attempted to use a 1/2" universal joint socket to couple
the shaft to the synchronous motor, and that appears to have too
much play to allow my motor to synch anymore. I have a video of it
online at
http://video.google.com/videoplay?docid=-1595599978891904649, you
can see the synch motor hunting. even though I was really happy to
get it running since it gave an arc at the first time, it still
needs tuning and I need to figure out the synch hunt problem. other
than that though, the bushing works, its just the other parts of the
rotary that are problematic.
I will post more info about my spark gap in a separate thread, but
as a starting point if you check out the video you see a wood box
that houses the motor, and another motor/gearbox hanging off the
side (Thanks Bart!) to turn the larger motor and thus adjust the
phase, and beside it a plexi box with two bearings, an axle and the
rotor connected using the keyless bushing.
Tuning happens this weekend and given the long list of changes I
need to make (some of them major, like the incorrect placement of a
second static spark
gap, in series with the cap thus at least halving the efficiency)
and the synch problem I will be able to get much better performance soon.
NICK