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Re: SRSG - rotor attachment

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>

Hi David,

Thanks for explaining the set screw situation. The next time your in a hardware store, you might want to scan the motor pulley section. It might be a good idea to pick up a pulley for the hub and replace the set screws at some point. The bushing is made to grip the shaft, all that is needed is a pulley with the same taper for the bushing. The reason I use the term "pulley" is because this is typically what the bushing is used for. The two screws in the front of the bushing are used to slide into the "through-holes" and screw into the pulley (the two threaded holes are used to push the pulley off of the bushing). Using the through-holes, the pulley will be pulled onto the bushing which then compresses and engages the motor shaft. The pulley comes with the two holes pre-tapped and aligned for the bushing through-holes. The disc itself is simply mounted to the pulley. There is no machining required except to drill holes for the disc to pulley attachment.

Just food for thought should you get the urge someday. From memory, I think I paid 5 dollars for the pulley. I would like to have used something other than a pulley, but that was all I could find. The pulley itself was 4.25" diameter by 7/8" thick.

Take care,

Tesla list wrote:

Original poster: "David Rieben" <drieben@xxxxxxxxxxxxxxx>


Ok, I see what y'all are after, now ;^) There are 2
setscrews and 2 tapped holes for the setscrews in the hub
lined up over the shaft key and keyway. I believe that I had to drill and tapp the screw holes for the setscrews in
the hub myself. I had almost forgotten about that particular
detail of the construction of the RSG. Also, I had to purchase
the little key for the motor shaft, as I don't recall the motor
coming with a key for the shaft keyway.

David Rieben

----- Original Message ----- From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Sunday, May 14, 2006 1:45 PM
Subject: Re: SRSG - rotor attachment

Original poster: "Barton B. Anderson" <bartb@xxxxxxxxxxxxxxxx>
Hi David,
Curious, we understand how the disc attaches to the hub.
How does the hub attach to the shaft?
Most taper bushing require an external part which the hub presses into. Thus, as the hub presses into the external part, the shaft to hub engages. But, the external part is not seen in the photos. How did you manage to press the hub onto the shaft? I can envision many methods, but I'm more curious of your solution.
Take care,
Tesla list wrote:

Original poster: DRIEBEN@xxxxxxxxxxxxxxx

The only picture that I have off hand is
the 8th picture down on my webpage at:
As you can see in the picture, the 3 bolts
fasten the rotor disc directly down to the
flat faced end of the bushing. Unfortunately
you can't see the bushing itself, as its view
is completely blocked by the disc itself. I am NO
machinist so I don't know if there's another
essential part that needs to be in place with
the bushing or not, but I do know that this
setup works quite well for me at holding
the disc very firmly in place with no wobble.

David Rieben

----- Original Message -----
From: Tesla list <tesla@xxxxxxxxxx>
Date: Saturday, May 13, 2006 11:06 pm
Subject: Re: SRSG - rotor attachment
To: tesla@xxxxxxxxxx

> Original poster: "Scott Hanson" <huil888@xxxxxxxxxxxx>
> David -
> I'm still not clear on the components you used.
> Looking at the Browning split taper bushings, I can see that they
> have a cylindrical bore (with keyway) that slides onto the motor
> shaft, a flange with three equally-spaced holes, and an external
> taper on the "body" of the bushing, also with a keyway. The
> bushing
> body is split so that some "additional part", with an internal
> taper,
> will clamp the split bushing to the motor shaft as the two mating
> tapers are forced together. Apparently the Browning adjustable
> speed
> drives that these taper bushings are designed for have this
> "additional" part as an integral part of their input shaft. I
> believe
> that the three holes in the flange and the three bolts supplied
> with
> the bushings are used to pull the bushings into the "additional
> part", which then forces the mating tapers together and clamps the
> split part of the bushing onto the motor shaft. The action of
> these
> mating tapers applies a compressive force of hundreds or thousands
> of
> pounds between the taper bushing and the motor shaft, creating a
> very
> strong connection.
> Since the "other half" of this split-taper bushing system seems to
> be
> an integral part of the Browning adjustable speed drive, what did
> you
> use to clamp the split bushing to the motor shaft?
> Do you have a photo of the completed coupling, with RSG disk
> Regards,
> Scott
> ----- 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
> >Scott,
> >
> >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