This is a multi-part message in MIME format. ---------------------- multipart/alternative attachment Julia, Just a quick thought, sometimes it appears that the jack is going back = under the hammer butt and even when the jack is pushed with a screw = driver to check for further travel, it will go no further. When in fact = the jack should go back further but is being stopped by too thick a felt = due to using too thick a square of felt when replacing a lost felt.Check = the distance the other jacks that work are moving.Sorry for the = disjointed thoughts in a hurry to get on the road. <G> Joe Goss RPT Mother Goose Tools imatunr@srvinet.com www.mothergoosetools.com ----- Original Message -----=20 From: David Skolnik=20 To: Pianotech=20 Sent: Tuesday, November 23, 2004 9:17 AM Subject: Re: jack slides out before delivering power Julia - Your description of the symptoms remains a bit unclear. Do you mean = that if you were to sit down at the piano and play each note forcefully, = once, that each would play, but if you were to do the same with a = minimal force, it would not? Or is it that a note, after being played = softly once, will cheat when attempted again? While Issac and David = Stahl might be correct in assessing the jack pinning as the problem, it = could also relate to key leveling, though the opposite to what you = suggested. If there is not enough (just enough) lost motion, the jack = will not return under the butt on a slow (soft) release. Besides = leveling, other possible contributing keyboard issues could be either = excess friction or excess front weighting. This could be further = aggravated by tight wippin pinning, excess friction between jack top and = butt leather, bad geometry of the butt profile, incorrect thickness of = butt cushion, or an imbalance between hammer return spring and jack = spring. =20 I recall working on a small Steinway consol, some years ago, where the = configuration of the lower butt geometry created the dilemma where, by = the time I eliminated excess lost motion, the jack would not navigate = over what appeared (to it) as an inverted speed bump. On the other hand, it might just be the jack pinning. Let us know. David Skolnik At 11:52 PM 11/22/2004 -0500, you wrote: Greetings,=20 Working on a Hamilton built by Baldwin studio upright = today, I noticed that on a reallly soft blow to the key, the jack wants = to slip forward almost to the back of the catch's shank, instead of = delivering the kick to the base of the hammer butt. The customer complained that, on a soft blow the key = wouldn't play and would sort of jam. Looking at this situation I saw = that the jack would sometimes just slip out too much forward and not = deliver its power. What would cause this? Could the keys not be levelled = high enough? Julia Gottchall, Reading PA ---------------------- multipart/alternative attachment An HTML attachment was scrubbed... URL: https://www.moypiano.com/ptg/pianotech.php/attachments/5c/9b/27/9d/attachment.htm ---------------------- multipart/alternative attachment--
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