[CAUT] restrung D

[RicB]

Yes yes... but as I read Alans post he was asking about the possibility 
of real differences in the speaking length due to real differences in 
terminations.  Not apparent ones due to in phase movement of the 
termination as a whole. Besides... your scenario dictates that the beat 
be a result of a horizontal in phase movement of the pin while the rest 
of the termination remains solid. But the pin is under very significant 
side pressure that counters that possibility to begin with, and secondly 
it is demonstratable that single string beats occur in all direction.  
There is no demonstratable correlation between the recessed edge and 
oblong surface area of the bridge pin hole and the occurrence of false 
beats.  And your final sentence is simply in error.  It is quite easy to 
show that tightest pins possible and recessed edges will display single 
string beats.  I see it all the time.

All this said... if the pin does indeed for whatever reasons vibrate in 
phase with the string at some partial and the rest of the termination 
does not... then a false beat will occur.  Its just that the cause / 
effect relationship is more complicated. The termination is not the 
bridge pin, it is the entire pin/bridge/and soundboard assembly that 
works together to assure the string is terminated to a sufficient enough 
degree or not. 

I fail to see why this is so difficult to see.  If one can first accept 
the rudimentary example sketched out in Jim Elliss's treatise on the 
subject in the journal from a few years back... it should be just as 
obvious that if the bridge as a whole is what is moving and taking the 
pin with it... in any given direction... that the same thing will 
occur... and that just as obviously a given combination of one component 
of the whole termination counteracting another can result in an abscence 
of a single string beat...which nicely explains why so many loose pin / 
recessed edge conditions do not produce a false beat.

Clearly... the whole issue is more complicated then the bridge pin alone 
can account for.

Cheers
RicB


     > While on this topic. I wonder if there is a slight difference in
    speaking
     > length as the string vibrates in its sideways excursion compared
    to the
     > speaking length while in its vertical excursion? If there is,
    would this
     > give a false beat to the string? If the pin and notch
    relationship has
     > become compromised for whatever reason, it might result in such a
    situation.
     >
     > Alan


        This is exactly the basis for flagpoling pins causing false
        beats, as I've been describing on Pianotech for years. The
        crushed notch edge supplies the lack of support that lets the
        pin flagpole, and seating the string or driving the pin mashes
        the string into the notch edge, temporarily clearing up the
        beat because the pin can't flagpole for a while. There are a
        lot of new pianos made with the notch edge entirely behind the
        pin. As long as the pin is tight at the top, these don't
        produce false beats.

        Ron N

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