[CAUT] Una chorda shift "click"

[David Ilvedson]

I can't remember which piano has the rolling bearing on the spring?   European...that seems like a really good idea...is it?

David Ilvedson, RPT
Pacifica, CA  94044

----- Original message ----------------------------------------
From: "Fred Sturm" <fssturm at unm.edu>
To: caut at ptg.org
Received: 11/24/2009 5:51:18 PM
Subject: Re: [CAUT] Una chorda shift "click"


>Sometimes a "click" occurs when the keyframe (and glides, and spring  
>and other contact points) "become mated" with the surface they  
>contact. So the first time you press the pedal, you get a kind of  
>clicking sound, usually less on subsequent times, and usually less  
>when pressing the pedal fast. Really the only fix is to address every  
>single bearing surface, making them all smooth, clean and well lubed.  
>The treble end of the keyframe might need some sanding to become  
>smooth (dents develop from contact with the spring). Metal should all  
>be polished with Flitz or the like, and have McLube applied to it.  
>Wood should all be sanded down to maybe 600 paper, wiped clean with a  
>rag, and have teflon applied.
>	Of course, loose wood joints or glides or whatnot could also be the  
>cause, as others have pointed out.
>Regards,
>Fred Sturm
>University of New Mexico
>fssturm at unm.edu
>On Nov 24, 2009, at 3:20 PM, Paul T Williams wrote:

>> Hi all,
>>
>> Our Steinway D in one of our halls has a weird clicking or groaning  
>> noise with the unacorda shift movement.  It makes a "click" or  
>> something like it when pushing the pedal down.  It is minimal when  
>> pushing quickly, but is very noticable on a slow push.  It's also  
>> even more noticable on pushing and releasing the pedal.
>>
>> I sanded and lubed the right side of the key-frame, and also  
>> polished the return spring, but it only went away slightly. It  
>> sounds like that is where the sound is occurring.  The lyre action  
>> is not where it's happening, so where might I look next?
>>
>> Thanks
>> Paul