Re: RSG rotor mount

["Tesla list" <tesla-at-pupman-dot-com>]

Original poster: "Barton B. Anderson by way of Terry Fritz <twftesla-at-uswest-dot-net>" <tesla123-at-pacbell-dot-net>

Hi Steve, 

I used a pulley and center-press hub mounting for my G10 disk. The pulley
mounts to the disk (you drill 3 holes into the hub and disk). The center hole
of the disk must be slightly larger than the press-center hub. I picked up both
the hub and pulley at Fleet Farm back in MN I think under $10. The hubs are
designed to fit the pulleys and come in standard motor shaft sizes. Therefore,
if you end up using a different motor some day, all you need to do is pick up
the hub for the shaft size. Here's photo of the disk and hub on my 1800 rpm
motor. My gap has changed immensely since this old photo, but the motor, disk,
and hub assy have not. This is also very secure in that it centers to the motor
shaft and pulley, unlike set screw style setups. 

 <http://www.classictesla-dot-com/photos/gizmos/5199-18.html>http://www.classic
tesla-dot-com/photos/gizmos/5199-18.html 

Take care, 
Bart 

Tesla list wrote: 
>
> Original poster: "Steve White by way of Terry Fritz <twftesla-at-uswest-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 am 
> 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.