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Re: SRSG - rotor attachment

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

Hi Scott,
Good question. I would be interested in David's matting hub as well. In my case, I used a pulley which was tapered for the hub. I bought it at Fleet Farm several years ago when I was living in Minnesota.
The pulley attached to the disk with 3 bolts I drilled. The pulley to taper bushing is performed with 2 bolts which came with the bushing. Here's a pic. 

http://www.classictesla.com/temp/2755.jpg
The pulley adds a bit of weight, which I prefer a nice slow start up. Adding a weighted disk to belt drive systems is an old method to prevent quick start up of motors (which can trash belts, especially, timing belts). Simply adding a weight gives a nice smooth start up. But obviously, the pulley is really the "missing" component you are appropriately identifying, at least for my set up. The pulley compresses the taper bushing. Very secure fit and almost impossible to screw up. Well, it does help to have some experience with the 2 hub bolts (how to turn each one a little at a time and not so much that you break the bolts). One of those "feel right" situations. 

Take care,
Bart

In eve

Tesla list wrote:


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 attached?

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

----- 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.
> > >
> > >
> >
>
>
>