Evidence of overlacquered hammers

[Bernhard Stopper]

David,

Yes that´s what i say. As long as you put the same amount of energy into the
key, the sound will not be louder. This the principle of conservation of
energy.

Bernhard

----- Original Message ----- 
From: "David Love" <davidlovepianos@comcast.net>
To: "'Pianotech'" <pianotech@ptg.org>
Sent: Saturday, October 02, 2004 2:34 PM
Subject: RE: Evidence of overlacquered hammers


> What you are saying then is that heavier and/or harder hammers do not
> make the sound louder except by the excitement of a different set of
> partials.  That's just not the case.  I'm sorry but I believe you are
> misinformed on this.  But don't take my word for it, ask a physicist or
> an engineer.  The amount of energy imparted to the string which is
> transferred to the soundboard is a function of mass and/or density of
> the object striking the string.
>
> David Love
> davidlovepianos@comcast.net
>
> -----Original Message-----
> From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
> Behalf Of Bernhard Stopper
> Sent: Saturday, October 02, 2004 1:21 AM
> To: Pianotech
> Subject: Re: Evidence of overlacquered hammers
>
> David wrote:
>
> >A panel which
> >moves less efficiently will require more mass, density or both from the
> >hammer in order to achieve the same displacement of air by its motion
> >than a panel that moves more efficiently for which a softer hammer will
> >achieve the same result.
>
> No i don´t agree, because there is the string between the soundboard and
> the
> hammer. If the string is too thin, more mass in the hammer has no
> possibility to arrive at the soundboard.
>
> Bernhard
>
>
> ----- Original Message ----- 
> From: "David Love" <davidlovepianos@comcast.net>
> To: "'Pianotech'" <pianotech@ptg.org>
> Sent: Saturday, October 02, 2004 2:40 AM
> Subject: RE: Evidence of overlacquered hammers
>
>
> > My understanding is that the soundboard is a transducer, not an
> > amplifier--there is no added energy--it's function is to convert
> energy
> > of the vibrating string into a larger moving body which has the
> ability
> > to move the air which the string by itself does not possess in
> > sufficient quantity.  The panel's ability to do that is a function of
> > several factors including:  panel thickness, rib dimensions and
> > stiffness, crown, spring rate, type of rim, location of bridges and
> > probably other things which I have forgotten.  Not all soundboards
> will
> > move with the same efficiency and some will move too much--or some
> areas
> > of the panel will.  The hammer imparts a blow to the strings and the
> > energy imparted is a function of hardness, mass or both.  A panel
> which
> > moves less efficiently will require more mass, density or both from
> the
> > hammer in order to achieve the same displacement of air by its motion
> > than a panel that moves more efficiently for which a softer hammer
> will
> > achieve the same result.  How the partials develop is a somewhat
> > different issue, which I am not addressing here.
> >
> > So, if not all panels are created equal, then one hammer will not
> yield
> > the same result on different panels.  How much different the panels
> need
> > to be to be able to hear that is another issue.
> >
> > David Love
> > davidlovepianos@comcast.net
> >
> > -----Original Message-----
> > From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
> > Behalf Of antares
> > Sent: Friday, October 01, 2004 12:52 PM
> > To: Pianotech
> > Subject: Re: Evidence of overlacquered hammers
> >
> >
> > On 1-okt-04, at 21:41, Bernhard Stopper wrote:
> >
> > > The time, the hammer is in contact with the string is the main
> effect
> > > of how
> > > many partials and in what weight they will occur. The soundboard
> > > itself has absolutely no possibiliy to add any partials to the
> strings
> > > spectrum (except the short shock spectrum caused by the hammer
> impact)
> >
> > > and
> > > acts only as an amplifier and filter. But the oscillator is the
> > string.
> > >
> > > best regards
> > >
> > > Bernhard Stopper
> > >
> >
> > Exactly. Thank you for your clear explanation Bernhard!
> >
> > André Oorebeek
> >
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