Action Geometry Consistency

[Isaac OLEG]

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I noticed that a checking of the centers heights and position on many action
stacks, but particularly Steinway, will show that there are disprcrepancies.

Correcting them with little papering , made in the cross direction of the
usual one, allow for a smoothing of these, I felt it immediately and it can
be measured in the DW UW relationship also.

Gluing himself the new rollers when changing shanks (with they shanks yet on
the rail and the centers checked) seem to take care of a lot of these
differences.

Rollers may be aligned with a rule - gluing time 30 min approx..
I've heard of some using a gig for that job, a picture would be appreciated
.

Thanks

Best regards.

Isaac OLEG

Entretien et réparation de pianos.

PianoTech
17 rue de Choisy
94400 VITRY sur SEINE
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
cell: 06 60 42 58 77

  -----Message d'origine-----
  De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la
part de Bradley M. Snook
  Envoyé : mercredi 14 mai 2003 07:28
  À : Pianotech
  Objet : Action Geometry Consistency


  When I do concert level regulation, I try and get key dip, aftertouch,
letoff, and blow distance as even as possible (in that order). As a general
rule, I try to maintain evenness in aftertouch and key dip, which forces me
to distribute the majority of the inaccuracies between the blow distance and
the letoff. Every once in a while I come across a note where something in
the action geometry is obviously wrong (e.g. to get everything else correct,
the blow distance would need to be in excess of 1/8" higher/lower than the
rest of the hammer line).

  What do I do to fix this problem?

  Bradley M. Snook
  Graduate Student in Piano Technology (M.Mus)
  Rice University, Shepherd School of Music

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