no hammer rise

[Willem Blees]

David

A couple of things to look for. When you say the hammer rises 1/16",?do you feel a slight kick in the key itself? If it does, that means the hammer wants to rise, but?the hammer pinning is too tight. Make sure the hammers swing at least 6 or 8 times. 

Another reason the hammer won't rise is because it is digging into the check too much. How high is the hammer checking? What is?the angle of the hammer tail and the back check? Make sure the rake of the check is even with the curve of the tail.


Willem (Wim) Blees, RPT
Piano Tuner/Technician
Honolulu, HI
808-349-2943
www.bleespiano.com
Author of 
The Business of Piano Tuning
available from Potter Press
www.pianotuning.com


-----Original Message-----
From: David Nereson <dnereson at 4dv.net>
To: Pianotech List <pianotech at ptg.org>
Sent: Wed, 11 Jun 2008 8:59 pm
Subject: no hammer rise



??? I'm trying to figure out why a grand action that seems to be regulated correctly, in terms of all the various adjustments, still?has no hammer rise, even with the repetition springs compressed to almost max.? Some of them rise just the tiniest amount.? On most actions, upon letting up of pressure on the key (but not letting the key up), they should rise from where they check, up to but not past the point of let-off.? But these barely rise 1/16" if at all.?? The checking distance isn't abnormally high; the rep. springs aren't weak; the rep. levers aren't pinned exceptionally tight; there's no gunk or goo hindering them; I suppose powdered Teflon on the knuckles might help a bit, but still . . . . I'm not sure what gives.? (It's a 1987 5'10" Kohler & Campbell.)

??? --David Nereson, RPT ??????

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