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Re: SRSG - rotor attachment

Original poster: "Gerry  Reynolds" <gerryreynolds@xxxxxxxxxxxxx>

Hi Bart,

I looked at the grainger bushings and thought the OD of the flange was rather small. The ones at McMaster are larger diameter (over 4 inches), which I think will be desireable for a larger rotor.

Gerry R.

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

Hi Terry,

I'm not impressed with the set screw shaft attachment. If there is any play in the coupler to shaft, the set screw is going to make the disk "wobble" (especially the looks of this attachment).

I use what I call a press-center hub (split taper bushing). David just mentioned his bushing from Grainger. That is certainly a better choice. They run $6 for a 5/8" bore, so they are very reasonable. The outer flange bolt holes are the same across a range of bore sizes, so coilers could easily pick up a bushing for a different bore (should they change their motor) without having to modify the disc. The secure attachment of this bushing as well as the center fit makes it a perfect choice for RSG disc mounting (and no machining required!).

Take care,

Tesla list wrote:

Original poster: "Terry Blake" <tb3@xxxxxxx>

Hi all,

There is an item called an arbor attachment for electric motors.
catalog page 2523.

The item description is as follows;
Convert your bench-mount motor into a grinder-buffer. Fit this attachment
onto the motor shaft and then mount wire wheel brushes, grinding wheels, and
more. Shaft thread is right hand. Flanges and hex nut are included.

They support shaft diameters from 1/4" to 5/8" and the most expensive one is
only $4.50.

Here is the one you may be interested in;
Item 43555A25
Arbor Attachment for Electric Motors Fits 5/8" Shaft Dia, 1/2"-20 Wheel
Arbor Size
In stock at $4.50 Each

I have never used one of these, but they look promising.

Remember to make an enclosure for the rotary gaps.


Terry Blake
Coiling in Chicago

----- Original Message -----
From: "Tesla list" <tesla@xxxxxxxxxx>
To: <tesla@xxxxxxxxxx>
Sent: Saturday, May 13, 2006 1:05 PM
Subject: Re: SRSG - rotor attachment

> 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.
> > >
> > >
> >