[pianotech] Weekend puzzler

[Delwin D Fandrich]

I should mention that the problem still existed with the action on the bench. So, even without the damper mechanism the problem persisted.

 

ddf

 

Delwin D Fandrich

Piano Design & Fabrication

6939 Foothill Court SW, Olympia, Washington 98512 USA

Phone  360.515.0119 — Cell  360.388.6525

 <mailto:del at fandrichpiano.com> del at fandrichpiano.com —  <mailto:ddfandrich at gmail.com> ddfandrich at gmail.com

 

From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf Of tompiano
Sent: Saturday, July 16, 2011 8:43 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Weekend puzzler

 


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

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  <http://us.mc1810.mail.yahoo.com/mc/compose?to=del@fandrichpiano.com> — ddfandrich at gmail.com <http://us.mc1810.mail.yahoo.com/mc/compose?to=ddfandrich@gmail.com> 

 

 

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