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:
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?


"Zootal" wrote in message
...

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
:-)


"DanG" wrote in message
...

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=prodIn dexRefinementSearch&originalValue=motor+arbor&L1=M otor

--
______________________________
Keep the whole world singing . . . .
DanG (remove the sevens)




"Zootal" wrote in message
news:H76dneAjSbzMTuTanZ2dnUVZ_veinZ2d@giganews. com...

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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