Heavy Hammers / High Ratio

[Delwin D Fandrich]

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  ----- Original Message -----=20
  From: Erwinspiano@aol.com=20
  To: pianotech@ptg.org=20
  Sent: September 24, 2003 7:57 AM
  Subject: Re: Heavy Hammers / High Ratio


  In a message dated 9/24/2003 12:42:30 AM Pacific Daylight Time, =
Richard.Brekne@grieg.uib.no writes:
    Hi folks..

    Been thinking about this  particular action configuration a bit and =
have
    a few questions swimming around in my mind. Configuring an action =
such
    that it has heavy hammers with a high ratio is going to cause the =
need
    for lots of counterbalancing... and quite often ends up being in the
    form of strong somewhat randomly regulated assist springs. This
    combination of high ratio, high hammermass, and low key mass has on =
the
    surface of it a couple interesting features. Its essentially the =
only
    way you can achieve high top action inertia against low key inertia
    while providing high hammer acceleration for key acceleration.... =
which
    further expands the ratio of hammer for key inertia. It would also =
seem
    to provide for the greatest change in required finger force (ie
    <<heaviness>>)  from ppp to fff  play.... and perhaps thats not such =
a
    bad thing ????

    Assuming one took the time to do a bang up job of evening out strike
    weights and key leading... and real even assist spring =
adjustments....
    what are the downsides of this setup ?

    RicB
    Flat knuckels from high hammer weight?
    Dale

  Increased wear & tear on the hammershank action centers?
      Del
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