Grinder wheel attachment for old grinder

I have an old grinder. It is a Dunlap sold by Sears, I'm guessing in the 60s or 70s. It is essentially a 1/3 horse electric motor with a 1/2 shaft sticking out each end. Attached to each shaft is an attachment that is female 1/2 inch on one end, such that it slides over the motor shaft and is held in place with a set screw. The other end is a threaded 1/2 stud with nut that you slide a grinding wheel (or whatever) on it and secure with nut. Any wheel or brush or whatever with a 1/2 hole will fit on this.
I need one of these attachments. I've been to hardware and auto part stores, and no one that I've found so far has any clue where I can find one of these. Does anyone have any idea where I can find such an attachment?
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Zootal wrote:

Look in Yellow Pages for 'electric motor repair'. Or call a furnace company and ask where they take their blower motors for repair or swapout. Furnaces, air handlers, table saws, etc- the motors are all pretty similar. The motor shop will have or know where to get all sorts of doo-dads to adapt shafts as needed. If there is an industrial park in your town, one of the buildings there is probably an industrial parts supply house- they will also likely have it. As would a farm equipment store, or a more rural ma'n'pa hardware store. A modern civilian big-box place has no interest in selling repair parts- they want to sell you a new grinder instead.
aem sends...
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Is Google not wotking any more? I have them, Look.
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I assume this is what you are after to convert a motor shaft to a right hand or left hand threaded shaft:
<http://www.grainger.com/Grainger/wwg/productIndex.shtml?L2=Shaft+Arbors&operator=prodIndexRefinementSearch&originalValue=motor+arbor&L1=Motor>
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That is *exactly* it! I didn't even know what they were called. I live in rural Oregon (Lebanon), and all I could get from the local stores here, as well as our few Big Box stores, was dumb looks.
Thanks guys - this is why I ask these oddball questions here - if it's anything remotely related to home repair or any type of power tool we might use around the home - someone here always seems to have the answer :-) :D

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So, now that I know what these things are called, surprise surprise they are available in many places, even on eBay. Question: Should I use a left hand threaded shaft on one side of the motor, and a right hand thread on the other side? Is there a danger of a grinding wheel coming loose if I don't?

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Absolutely. If you are using a double ended motor, both shafts turn the same direction and so one is going clockwise the other counter. You will need one of each to play. ______________________________ Keep the whole world singing . . . . DanG (remove the sevens) snipped-for-privacy@7cox.net

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yes and yes. assuming that when you're facing the grinder, both wheels are rotating so that the face of the wheel is moving down (or in other words, if you look at the RH wheel face on it is rotating CCW) you should use RH thread on the RH wheel and LH thread on the LH wheel. that way the wheels will tend to tighten themselves in use, not loosen.
nate
(I hope I got that right)
Zootal wrote:

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It's called a motor arbor and Harbor Freight has them real cheap. HTH
Joe
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On Mon, 31 Dec 2007 21:44:40 -0800, "Zootal"

Bought both grinding wheel and wire wheel at Home Depot a few years back.
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wrote:

They do have wheels, but they don't carry arbors that big. All they have today is arbors for small hand tools.
What is amazing is how many hardware stores I walk into, show them the arbor I have, and have them stare at it like it came from another planet.
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