[pianotech] Mysterious Key Noise

[piannaman at aol.com]

 I'm not sure how you're lifting the damper to test it...do you mean with the key, or by hand?  I'm assuming with the key.  

Have you looked at the back check to see if it might be hitting something like a sostenuto rail bracket.  I've seen that more than once.


 

 

Dave Stahl
 

 

-----Original Message-----
From: David Ilvedson <ilvey at sbcglobal.net>
To: pianotech at ptg.org
Sent: Wed, Oct 28, 2009 11:14 am
Subject: Re: [pianotech] Mysterious Key Noise










I agree.   We are talking one key, if you absolutely can't see what is going on 
back there, remove a few parts and reinstall the action.   It seems to me, the 
key should show some marks where it is hitting something.   

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: Kerry <kerrykean at att.net>
To: pianotech at ptg.org
Received: 10/28/2009 6:53:41 AM
Subject: Re: [pianotech] Mysterious Key Noise


>That addresses the symptom, not the problem. If it is the keyend hitting the
>tray, which seems likely, you need to find out why and fix it. Is the tray
>warped or moving for some reason? If the end of the key sticks out too far,
>it's easy to remove some wood but maybe it's a pulley key (enlarged balance
>pin hole) that slides back far enough to contact the tray.  

>Kerry Kean
>www.ohiopianotuner.com


>-----Original Message-----
>From: William Truitt [mailto:surfdog at metrocast.net] 
>Sent: Wednesday, October 28, 2009 5:48 AM
>To: pianotech at ptg.org
>Subject: Re: [pianotech] Mysterious Key Noise

>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





 

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