Strike Point

[Bernhard Stopper]

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Dear Joe,

You may use the new Mensurix 5 with the built in physical modeling of =
the hammer/string interaction for the inspection of the strike points. =
Especially in the Pro Version there is a strike point optimizer that =
calculates a predefined amount of strike points (typically about 30-50) =
and reports the results on a graph with loudness against the different =
strike point lengths. What can be found by this simulations, is that the =
optimal strike line is not on a geometric line. There are more or less =
several points that have a nearly constant size measured from te =
agraffe, where beyond them the loudness will decrease rapidly and =
increase slowly again (but always less than the precedent maximum). The =
first maximum distance is about 3 milimeters away from the agraffe (the =
exact value depend most on hammer mass and string tension and to some =
amount of the hammer stiffness). This first short distance can be used =
only for the last hammers in the treble depending on the construction of =
the instrument (agraffes on a grand etc) and and the size and shape of =
the hammers.
As a consequence of these results to keep a constant hammer shank =
length, (for an equal strike weight and touch weight) the bridge side =
termination must be rearranged also, what is only possible in the =
construction of a new instrument or by restringing/recapping of the =
bridge. It would me not astonish to find out that the constructors of =
the old first class instruments of the last century had covered such =
breaks (which they may have found by experiments) into the offsets at =
the iron frame breaks.

Regards,

Bernhard

You may download a free demo of the Mensurix 5 at:
http://www.piano-stopper.de/dl/Mensurix_5.0.10.msi



----- Original Message -----=20
  From: Joe Garrett=20
  To: pianotech=20
  Sent: Monday, October 04, 2004 4:36 AM
  Subject: Strike Point


  Over the years, I've experimented and studied the various =
recommendations for Strike Point. None seem to, truly satisfy me. I'd =
like to hear anyone's preferences, on the subject. What prompted this, =
is: I just recently had a New Key Set made, that esstablishe a new =
balance point, etc. In the process, the maker, (not to be named), threw =
out the old action rails, etc., from the original, (1860's Chickering, =
parallel strung, 8 footer.)! Yikes! Unfortunately, he did this with the =
owners say-so, instead of consulting me! Damn! Anyway, I'm going to be =
re-establishing the strike points and think some feed-back from y'all =
would put my mind, a bit more at ease. (well....maybe not, knowing you =
guys/gals!<G>)
  Any info would be appreciated.=20
  Best Regards,
  Joe Garrett, R.P.T.
  Captain, Tool Police
  Squares R I
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