[pianotech] Weekend puzzler

[tompiano]

Ok, then my next line of reasoning would be two-fold:
1. an extremely worn key-end felt. On a soft blow the underlever is implanted deep in the worn key-end felt making is difficult to get the key in motion. But after accelation, or a heavy blow, the underlever has past the worn surface and the key is free to move.
2. could be that in addition to this problem the damper underlevers have been regulated way to low, compounding the problem.
Tom Servinsky
--- On Sat, 7/16/11, tnrwim at aol.com <tnrwim at aol.com> wrote:


From: tnrwim at aol.com <tnrwim at aol.com>
Subject: Re: [pianotech] Weekend puzzler
To: pianotech at ptg.org
Date: Saturday, July 16, 2011, 11:13 AM



Flat knuckle
Center pin coming out of jack, rubbing against neighbor jack flange
Burr on top of front rail pin. 
 
Wim





-----Original Message-----
From: Delwin D Fandrich <del at fandrichpiano.com>
To: pianotech <pianotech at ptg.org>
Sent: Fri, Jul 15, 2011 8:09 pm
Subject: [pianotech] Weekend puzzler



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The piano is a 1928 Chickering Model M, Scale 141 (small concert size). The problem is this:
 
As the key is depressed slowly—pianissimo—for the first millimeter or so the key and hammer move smoothly. Then something starts binding, it feels like something in the action is dragging, holding the key and action back. After forcing the key down another three or four millimeters action becomes free and everything operates normally. On a medium to hard blow there is good power and the problem is hardly noticeable but at pianissimo the action will hardly play.
 
What is the problem and what caused it?
 
ddf
 
Delwin D Fandrich
Piano Design & Fabrication
6939 Foothill Court SW, Olympia, Washington 98512 USA
Phone  360.515.0119 — Cell  360.388.6525
del at fandrichpiano.com — ddfandrich at gmail.com
 
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