[pianotech] Kawai Pedal Lock Nuts

[David Porritt]

Ron:

I've seen hex nuts meet just as all the flat sides are together.  In those
cases one needs to tighten them so the nuts are tight on each other (and the
flat sides are no longer aligned - not that that matters).  But you are
right if they are _tight_ not just aligned with the flats parallel, the
locked nut won't/can't move.

dp

______________________
David M. Porritt
dmporritt at gmail.com


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Tuesday, April 17, 2012 1:30 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] Kawai Pedal Lock Nuts

On 4/17/2012 12:19 PM, Paul Milesi wrote:
> "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.

It just isn't physically possible. If the nuts are tightened together, the
threads are jammed in opposite directions on the shaft and they won't turn
on the shaft. If they turn, they aren't tight. What "alignment" are you
talking about that would make them turn?
Ron N