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Re: RSG rotor mount

Original poster: "Mark Broker by way of Terry Fritz <twftesla-at-uswest-dot-net>" <broker-at-uwplatt.edu>

I made mine out of 2" diameter aluminum stock that's lying around the physics
shop (they'll never miss a 3" section since the rod ahs probably been sitting
there for about 5 years....).  The first one turned out OK - alittle "out of
true", but mostly on the rotor, and not the hub.  The second one is still in

Since most people don't have access to a metal lathe....  get a piece of 1x2x2"
solid aluminum (I suppose steel would work, too) stock, carefully mark and
drill the center, and drill and tap 4 1/4-20 threads at the corners, and one to
use as a set screw.

If you don't have access to "free" metal stock, you can purchase a V-belt pully
(3"D, probably) from any hardware store for ~$3, and have a machine shop true
it up and even drill some holes around the edge (tap the rotor, not the
pully).  Terry uses a 1/2" drill chuck (~$15 from any HW store) that is clamped
to a 1/2" bolt (or 3/8" or osmething like that), and claims great success.


Tesla list wrote:

> Original poster: "Steve White by way of Terry Fritz
> <mailto:twftesla-at-uswest-dot-net><twftesla-at-uswest-dot-net>"
> <mailto:slwhite-at-zeus.ia-dot-net><slwhite-at-zeus.ia-dot-net>
> I am currently building a 3600 RPM RSG. The rotor is 10" diameter, 1/2" thick
> G10. I am currently using an arbor to attach the rotor to the motor
shaft. Due
> the imprecision of the arbor face, the rotor still has about 1 mm of
runout at
> the edge. I am also somewhat uncomfortable using an arbor at 3600 RPM with a
> 10" diameter 1/2" thick G10 rotor. My question is this. Does anyone know of a
> suitable device for mounting the rotor to the motor shaft? A pulley or spur
> gear with a flat face come to mind. I am thinking of buying a spur gear from
> McMaster-Carr for this purpose. It is quite expensive (about $40). I a!
> m
> assuming that the gear face is flat. If not, I could have a machine shop true
> it up. Does anyone have any better ideas? Any suggestions appreciated.