[pianotech] Bouncing Bostons

Ed Foote a440a at aol.com
Fri Jul 30 03:08:36 MDT 2010


 


Ed, why do you think 1 3/4" and .400" is markedly out of the normal range?  Just curious.  I find that this amount of key travel is on the wider side, but still workable with 1 3/4" blow in a lot of actions.  Didn't get to measure the action ratio or strike weights.

 

 I don't know what is normal to Bostons, but I have usually needed the .400" dip with longer blows, like on the B and D Steinways.
  As far as the bouncing on staccato,(non-checked) blow.........  That sounds like an excessively heavy FW or just maybe, an excessively tight balance rail hole, or even, as R. Jolly likes to zero in on, a balance rail hole that has too much wood left at the bottom of the pin mortise, causing a key that "wants" to spring back off the front punching. 
( I know it sounds like I'm grasping at the straws, but, yea, I am). 
Regards,

Ed Foote RPT
http://www.uk-piano.org/edfoote/index.html
 
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