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Posted by Grant Erwin on April 23, 2006, 6:10 pm
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I have a little Rockwell 3-phase grinder I picked up recently. It had been wired
completely wrong and today I rewired it and it runs smooth as glass. I have the
same problem with it that I have had with every bench grinder, though. The shaft
spins one way, so the wheels rotate down towards the tool rest. The nut on one
end of the shaft is RH and the nut on the other end is LH. If I put a wrench on
both shaft nuts and crank, one will loosen. The question is, how do I loosen the
other one? I can't for the life of me see why grinder manufacturers don't put a
hole you can put a pin in to lock the shaft for changing wheels. I sure don't
want to put Vise Grips on the naked threads - what is the trick I'm missing?
GWE
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Posted by Tom Gardner on April 23, 2006, 6:36 pm
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>I hand tighten then take a long box wench on the nut and slap the far end
>of same with another wench. I have been doing this for over 50 years and
>have had fellow workers
> say I tighten them too much. It is the slap that does it and it works for
> me.
> Jim
What size is the other wrench?
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Posted by Tom Gardner on April 23, 2006, 9:39 pm
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> If the nut takes a 3/4 box wrench I use the next size larger or smaller
> size.
> Jim
Good restraint!
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Posted by Glenn on April 23, 2006, 11:23 pm
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> OK, I took a short nap and as often happens woke up with the solution. The
> solution in this case is laughably trivial - if I turn the wrenches one
> way and it removes the wrong shaft nut, the solution is simply to turn the
> wrenches the other way. I have had a serious case of cranial rectumitis
> over this issue for many years apparently.
>
> Think if it were a piece of e.g. allthread. Grab one nut and put a wrench
> on the other, and if you tighten one nut you tighten them both, right?
> Well, if one end of a shaft has a RH thread and the other has a LH thread,
> then if you tighten one you loosen the other. So removing isn't a problem,
> it's tightening that's a problem, and that must be why everyone was
> telling me to use impact to tighten it.
>
> Sigh. At least the world is back in order, and I got my other wheel off.
>
> GWE
Sorry .. I thought you were trying to get your nuts off .. I definately
wouldn't use an impact to put em on.
:)
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Posted by Proctologically Violated©® on April 23, 2006, 6:37 pm
Please log in for more thread options They make vise-grips for tubes/shafts. A split thin-walled tube (or roofing
copper, etc) over the unthreaded part of the shaft end that loosened should
give the 'grips a good grip, w/o gouging the shaft.
You might also consider machining (grinding?) a square or hex onto the end
of each shaft, that clears the nut, if you have the extra shaft length.
Now, what's the secret to getting these goddamm wheels to run *true*????
goodgawd....
--
Mr. P.V.'d
formerly Droll Troll
>I have a little Rockwell 3-phase grinder I picked up recently. It had been
>wired completely wrong and today I rewired it and it runs smooth as glass.
>I have the same problem with it that I have had with every bench grinder,
>though. The shaft spins one way, so the wheels rotate down towards the tool
>rest. The nut on one end of the shaft is RH and the nut on the other end is
>LH. If I put a wrench on both shaft nuts and crank, one will loosen. The
>question is, how do I loosen the other one? I can't for the life of me see
>why grinder manufacturers don't put a hole you can put a pin in to lock the
>shaft for changing wheels. I sure don't want to put Vise Grips on the naked
>threads - what is the trick I'm missing?
>
> GWE
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>of same with another wench. I have been doing this for over 50 years and
>have had fellow workers
> say I tighten them too much. It is the slap that does it and it works for
> me.
> Jim