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Re: SRSG - rotor attachment

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.


PS. this message is also partially a response to Phil (FIFTYGUY) who wanted to hear the results when I tried out the keyless bushing... here it is, and will be much better soon.

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, May 13, 2006 1:34 PM
Subject: Re: SRSG - rotor attachment

Original poster: DRIEBEN@xxxxxxxxxxxxxxx

I did not actually get my bushings from McMaster-Carr,
but rather from Grainger. Grainger has a local distri-
butor in my hometown, so I just went there and picked
up one instead of ordering. I'm looking at an old Grain-
ger catalogue (2000-2001) on page 325 and they have quite
a selection of them. The manufacturer is Browning and they
have them for shaft diameters from 3/8" all the way thru
5". I simply centered and drilled three holes in the ro-
ary disc that matched up to the three holes in the bushing,
then simply fasten the disc to the bushing with the bolts
that are provided with the bushing. This has proven an
effective way to fasten the disc to the motor shaft for
me and, as a matter of fact, I picked up the split taper
bushing idea right here from the Tesla list (sorry, I
can't remember exactly who it was).

David Rieben

PS - The Grainger supplier may ask which company you're
with as they do not generally sell to the general public.
I simply told them who my employer was and sure enough,
my employer had an account with them. Of course, I paid
for it with MY OWN cash ;^) Of course, Grainger also
has a webpage: www.grainger.com

----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Saturday, May 13, 2006 1:08 pm
Subject: Re: SRSG - rotor attachment
To: tesla@xxxxxxxxxx

> Original poster: "Scott Hanson" <huil888@xxxxxxxxxxxx>
> David -
> The split-taper bushings listed by McMaster-Carr are just the
> adapters needed to couple a motor shaft of a specific diameter to
> a
> flanged hub that you would bolt the RSG rotor to. As far as I can
> tell, McMaster does not offer just a flanged hub with the correct
> female taper to accept the split-taper bushings.
> They do offer hardened steel sprockets that accept the taper-lock
> bushings, but these are through-hardened and would take a lot of
> machine work (EDM & grinding) to remove the sprocket teeth and add
> the bolt holes for the RSG disk.
> Or have you found something hidden in the McMaster catalog that
> would
> provide the complete solution for mounting an RSG disk directly to
> a
> motor shaft (3/8", 1/2", 5/8", or 3/4" dia)?
> Regards,
> Scott Hanson
> ----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
> To: <tesla@xxxxxxxxxx
> Sent: Saturday, May 13, 2006 9:56 AM
> Subject: Re: SRSG - rotor attachment
> >Original poster: DRIEBEN@xxxxxxxxxxxxxxx
> >Gerry,
> >
> >You can get these adapters from McMaster-Carr
> >or a local branch of an industrial supply
> >chain like Johnstone or Grainger. What you're
> >looking for is called a "split taper bushing".
> >
> >David Rieben
> >
> >----- Original Message -----
> >From: Tesla list <tesla@xxxxxxxxxx>
> >Date: Saturday, May 13, 2006 8:30 am
> >Subject: SRSG - rotor attachment
> >To: tesla@xxxxxxxxxx
> >
> > > Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>
> > >
> > > Hi All,
> > >
> > > My previous SRSG used a motor that already had an aluminum piece
> > > to
> > > attach the rotor to the motor shaft.  My higher HP motor does not
> > > have this adapter (not sure what the correct name for it is).
> > > Does
> > > anyone know where I can get an adapter for a 5/8 dia motor shaft
> > > to
> > > attach the rotor to (or do I need to machine it)???
> > >
> > > Gerry R.
> > >
> > >
> >