[pianotech] high leverage action

Richard Brekne ricb at pianostemmer.no
Fri Mar 13 11:34:16 PDT 2009


What are your Hammer Strike weights and key Front Weights ?  Your dip 
and blow say low ratio but your KR and knuckle distance says high. How 
much aftertouch are you getting with things as they are... how far out 
from under the knuckle does the jack move ?

41 mm is on the short end of the stick to be sure.  I usually dont see 
under 44 and never allow for less when redoing an action.

Cheers
RicB


    Hello list,
    Thought that I would seek comments on an action with high leverage.
    Key dip is 10.5mm and blow distance is 41mm.
    The touchweights are in the low 50's down and low 30's up.
    Knuckle spread 16.5mm
    Key ratio is 1.81
    Action spread is 113mm and is adjustable.
    Any more dip will make the sharps about level with the naturals when
    depressed. The feel of the samples are acceptable. Seems that 41mm
    blow distance is short - but is it too short? Maybe some loss of
    power? Is there a down side to this action? Any corrective
    suggestions? It is in the sampling - disassembled stage.
    Thanks,
    Gene





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