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Posted by Joseph Gwinn on April 15, 2008, 9:01 am
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> [ ... ]
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> >> Well ... probably the nuts on the left-hand side of the grinder
> >> are left-hand thread -- but at least for the right-hand nut -- chuck an
>
> [ ... ]
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> > The left arbor has a left-hand thread, the right arbor has a right-hand
> > thread. Both are M16x2. (There is no rotor lock, so it can be hard to
> > tighten and loosen the nuts.)
>
> That is common with all bench grinders that I have used.
>
> > I don't know how common left-hand metric bolts are round these parts.
>
> :-)
>
> > MSC and Grainger have none. Nor do I really want to buy 100 of these
> > nuts. At $20/100 times two, or $40, it's 2/3 what the grinder cost.
>
> Understood.
As mentioned in another posting, it turns out that McMaster-Carr stocks
left-hand M16x2 nuts.
I also talked to Ryobi yesterday, and will call their local distributor.
The hope is that Ryobi has after two years already worked their way
through that batch of bad nuts. And I know one of the local service
centers - their people are able to use such products, and so should be
able to understand the problem. And to tell a good nut from a bad nut.
> >> I could probably make you a stud for facing the left-hand nut
> >> which you (presumably) already have -- using the Compact-5/CNC Emco
> >> Maier lathe. But I will have to trust measuring over wires, because I
> >> don't have a left hand thread sample to work from.
> >
> > I'm not sure that the threaded stud to hold the nut to be faced will
> > work, as both faces are crooked, so the nut will tilt to one side when
> > tightened down to allow facing the free face.
>
> How loose is the nut on the arbor?
You mean freedom to wobble when not tightened down? It's got to be a
few degrees, by eye, though I never measured it. These are not
precision instrument threads. But it's not loose enough for the nut to
rest flat when tightened.
> > I think that the only
> > solution is new nuts. I could make these nuts if I bought a set of
> > taps, but even that is going to cost a major fraction of the cost of the
> > grinder.
>
> :-)
>
> > I'm going to call Roybi first. Maybe they have resolved their supply
> > problem. Or gotten lucky.
> >
> > Hmm. I wonder what thread Jet grinders use?
>
> A good question. I have an 8" Jet grinder -- and it has been an
> excellent one so far. I guess that I could try measuring the thread on
> the right-hand end with a thread checker or a thread pitch gauge. Even
> if it is the same thread size and pitch, I don't know how different the
> actual fit might be. :-)
I'm betting that if it's a standard M16x2 nut, it will fit. I don't
think Ryobi made the arbor threads wrong. I think they bought some bad
nuts.
If I replace the Ryobi, I'll look at Jet.
In retrospect, I should have boxed the Ryobi grinder up and dropped it
right in Ryobi's lap, to fix or replace or refund, back when this saga
began.
Joe Gwinn
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