[pianotech] Mysterious Key Noise

[William Truitt]

And if you remove the cheek blocks and then slide the action out a smidgen,
the noise should go away if the key is hitting the tray.  If you are lucky,
this piano will have an adjustable cheekblock that will allow you to
position the action far enough out to eliminate the noise.

Will Truitt

-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Ron Nossaman
Sent: Wednesday, October 28, 2009 12:35 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Mysterious Key Noise

Patrick C. Poulson wrote:
> 
> Greetings: I am working on a grand piano that has a noise coming from C2 
> that is eluding me. The symptom is a knocking that occurs on the 
> downstroke. The noise disappears when the sustain pedal is depressed, 
> but still present when the C2 damper is lifted individually. I initially
> thought it was the key end felt, but the fact that the noise remained 
> when I lifted the damper manually excluded that as the source. 

Right, and it also excluded damper leads, flanges, springs, 
and up stop rail for similar reasons. It also excludes the 
wippen, since the noise disappears with the pedal depressed, 
but not with the damper lifted. What's left is what Dave 
Porritt suggested as the likely cause. The key end hitting the 
damper tray.

Ron N