Changing Harmonicity

[David Love]

I agree, it would seem that inharmonicity is a physical property related to
tension, diameter, material, etc..  However, the dominance of certain
partials is clearly effected by such things as hammer weight and density. 
So, while the inharmonicity does not change, the measured inharmonicity can
change.  This might, then, influence how a piano is tuned.  So, on a
practical level should we tune before we voice, or voice before we tune?  I
think the answer is, both! 

David Love
davidlovepianos@earthlink.net


> [Original Message]
> From: Overs Pianos <sec@overspianos.com.au>
> To: Pianotech <pianotech@ptg.org>
> Date: 3/4/2004 11:11:36 AM
> Subject: Re: Changing Harmonicity
>
> >  > One of those other parameters is Hammer Weight.  It has been
reported to
> >me
> >>  by Vince Mrykalo that increasing the hammer weight reduces
inharmonicity
> >>  significantly....
> >
> >How?  By diminishing the influence of higher (more inharmonic) partials??
>
> At 11:59 AM -0500 3/3/04, Sarah Fox wrote:
> >
> >I don't see how the properties of an impulse delivered to a resonant
system
> >can alter the resonant frequencies of that system.
>
> Neither can I. The four known factors which determine inharmonicity 
> are wire stiffness (including that of the wrap wire in the bass), 
> string tension, the shape of the string termination and the length of 
> free string segment on the other side of the speaking length 
> termination (ie. the duplex or counter-bearing string segment).
>
> Ron O.
> -- 
> OVERS PIANOS - SYDNEY
>     Grand Piano Manufacturers
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