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Key regulation

  • 1.  Key regulation

    Member
    Posted 27 days ago
    Hi all,
    I am a beginner of  the piano regulation. I tried to regulated my own grand piano these few month. Today I removed these keys from the action. I found that  some keys are unbalanced and they have settled down. What's wrong with these keys? How to repair them? Thank you!

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    Shawn Tang
    Piano teachnician
    Tualatin OR
    518-606-0041
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  • 2.  RE: Key regulation

    Member
    Posted 27 days ago
    It didn't show up in the photo above, so I re-uploaded it.

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    Shawn Tang
    Piano teachnician
    Tualatin OR
    518-606-0041
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  • 3.  RE: Key regulation

    Registered Piano Technician
    Posted 26 days ago

    Shawn,

     

    Grand piano keys are individually weighted to balance the weight of the upper action / hammers.  If you look at the locations of the lead weights in the keys, they probably correspond to which keys are staying up, and which are going down when you removed the upper action.

     

    Whether the weights were installed correctly for an even touch is not at all a sure thing.  But having keys that are unevenly weighted is not at all unusual.  For now, I would suggest that you just work with the regulation of the action and learn about that.  Later you can consider whether the piano needs re-weighting.  If this topic gets going here, it tends to get very complicated and highly opinionated.

     

    Another thought is that the key friction is not even, in that some keys might just not be moving freely enough.  We can't tell this because these are static photos.  If you move the keys, are they free enough to go back to the positions shown?  Or do they stay up or down depending where you move them?  If they settle back to the up or down positions shown, then it is the weighting.  If they stay wherever you move them to, it is the friction.

     

    Don Mannino RPT

     

     

     

     






  • 4.  RE: Key regulation

    Posted 27 days ago
    Hello Shawn.
    It looks like the keys that are down in the front, are raised in the back.
    Check the back rail cloth and possibly added felts or other stuff attached/stuck to the bottom of keys in the back or on/under back rail cloth.
    Peter

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    Petrus Janssen
    Peachtree City GA
    678-416-8055
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  • 5.  RE: Key regulation

    Member
    Posted 26 days ago
    My first guess is the keys are tight on the pins. Also, there might not be any lead in the keys (or not enough)
    and Touch Weight is relying on rep spring-assist tension (muy malo).

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    Regards,

    Jon Page
    mailto:jonpage@comcast.net
    http://www.pianocapecod.com
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  • 6.  RE: Key regulation

    Member
    Posted 26 days ago
    Hi Petrie,
    Thank you for your reply. I checked the back rail cloth, it looks like same other normal key's back rail cloth. Yes, I think front key is too heavy.

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    Shawn Tang
    Piano teachnician
    Tualatin OR
    518-606-0041
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  • 7.  RE: Key regulation

    Posted 27 days ago
    Or possibly just too heavy in the front...

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    Petrus Janssen
    Peachtree City GA
    678-416-8055
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  • 8.  RE: Key regulation

    Member
    Posted 26 days ago
    I would suggest removing the keys and checking the condition of the key pins and key bushings. The key pins may be nicked/rusty/tarnished and the bushings may be old/worn/frayed. Cleaning and polishing the keypins may help but it is very possible the keys need to be eased at the balance pin hole and the mortises at the front key pin. Key easing needs to be done with the proper tool(s) and technique else there is danger of overdoing it causing a loose key fit causing noise, loss of power and poor touch and control

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    James Kelly
    Owner- Fur Elise Piano Service
    Pawleys Island SC
    843-325-4357
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  • 9.  RE: Key regulation

    Registered Piano Technician
    Posted 26 days ago
    In addition to the possibility that the keypins "may be nicked/rusty/tarnished," check to ensure that the front rail pins are not turned. Viewed from above, theirs is an oval shape that should be oriented 12:00/6:00.

    Alan

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    Alan Eder, RPT
    Herb Alpert School of Music
    California Institute of the Arts
    Valencia, CA
    661.904.6483
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  • 10.  RE: Key regulation

    Registered Piano Technician
    Posted 26 days ago
    Binder clip on the front rail pins helps see orientation better.

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    Larry Messerly, RPT
    Bringing Harmony to Homes
    www.lacrossepianotuning.com
    ljmesserly@gmail.com
    928-899-7292
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