"Nonsense. It doesn't matter a whit how perfectly mated the nuts are or not. If they are tightened together, they will grip the threaded shaft without turning." -Ron N Ron, Empirically, I can't help but believe this simply isn't' true. In my experience, Joe's comment about the threads of the two nuts sometimes ending up perfectly aligned after tightening does happen, and the result is that the two nuts turn as one on the shaft just as easily as one, no matter how tight. Have seen this on a couple occasions, and no amount of tightening will change that reality, once they are as tight as they can be. Interesting that I inquired about this back on 1/21/12, and received a few answers. The one from Paul Bruesch was the one I trusted the most at that time. I think Joe's got it right now. Paul Milesi RPT Washington DC (202) 246-3136 Cell/Text paul at pmpiano.com http://www.pmpiano.com On 4/17/12 12:18 PM, "Ron Nossaman" <rnossaman at cox.net> wrote: >On 4/17/2012 10:50 AM, Joseph Garrett wrote: >> Lim asked: >> "Usually I locked the 2 nuts together but I have seen the lower nut >> tightened to the rod. Which is correct? >> Thanks from Lim" >> >> Lim, >> The key phrase is "Lock Nuts". Or, some people call them Jam Nuts. The >>idea >> is to "jam" one nut against the other, thereby they will bind on the >> threaded shaft. Most of the time this works as designed. However, if the >> two nuts are perfectly mated, then they become one and will still pivot >>on >> the shaft. If this occurs, then add a thin washer between the two nuts. >>-Joe Garrett > >
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