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#2242076 - 03/06/14 07:52 AM Jack slow to return to its resting state
malte Offline
Junior Member

Registered: 01/19/14
Posts: 8
I am currently going through the regulation process of a grand piano action as described in A. Reblitz's book. I've decided to start with a thorough clean and complete disassembled the action.

Now I've noticed that on a couple of wippens (noticably they are all in the middle octave), the jack is very slow to return to its resting state, by which is mean the following: If I press on the jack toe and then release it, it takes about a whole second to slowly creep back to is resting state.

Before disassembling the piano, the action wasn't badly regulated, but I'm assuming that I would have noticed this problem when playing on the piano, so I wonder I have caused this problem? The one thing that I did do was clean the springs and then grease then with graphite... But the only wippens that have this problem are, like I said, located in the middle octave.

In addition to that, I don't think that this has anything to do with the jack spring, because if I depress and then release the repetition lever, the springs pulls it back into place quickly.

Anyway, what might be the problem?

PS: I should also mention that some of the notes in the middle octave are not affected. So for instance C4 is affected by C#4 is not.


Edited by malte (03/06/14 07:54 AM)

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#2242092 - 03/06/14 08:31 AM Re: Jack slow to return to its resting state [Re: malte]
Mark Cerisano, RPT Offline
1000 Post Club Member

Registered: 01/24/10
Posts: 1204
Loc: Montreal, Quebec, Canada
Hello,

This condition presents itself when trying to repeat one note fast.

I cannot think how you could have created this problem by taking it apart.

The problem is a tight center pin on the jack. Do you know how to replace it? Removing the wippen can be tricky. It's different from piano to piano. Reblitz doesn't cover that.
_________________________
Mark Cerisano, RPT
www.howtotunepianos.com

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#2242123 - 03/06/14 09:42 AM Re: Jack slow to return to its resting state [Re: Mark Cerisano, RPT]
Chuck Behm Offline
500 Post Club Member

Registered: 01/12/10
Posts: 671
Loc: Boone, Iowa, USA

Hi - I would suggest trying a drop of CPL on the pivot point. Chuck Behm
_________________________
Tuner/Technician/Rebuilder/Technical Writer
www.pianopromoproductions.com
515-212-9220

"The act of destruction is infinitely easier than the act of creation" - Arthur C. Clarke

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#2242150 - 03/06/14 10:49 AM Re: Jack slow to return to its resting state [Re: malte]
Jon Page Offline
Full Member

Registered: 03/13/09
Posts: 259
Loc: Harwich Port, Cape Cod, Massac...
You mentioned greasing with graphite. Is that graphite grease? This is a bad thing. Where did you apply this? DAG is the proper material, then burnished. Sluggish jacks are caused by friction in the center pin bushing. Do you have a mentor?
_________________________
Regards,

Jon Page
Piano technician/tuner
Harwich Port, Cape Cod, Massachusetts, USA
http://www.pianocapecod.com

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#2242152 - 03/06/14 10:55 AM Re: Jack slow to return to its resting state [Re: malte]
Ed McMorrow, RPT Offline
2000 Post Club Member

Registered: 12/09/12
Posts: 2001
Loc: Seattle, WA USA
In a butterfly spring type whippen-sometimes the shape of the end of the spring and/or the hole in the jack are such that friction is created-which stops the jack from returning properly. Changing the shape of the spring end cures this.

From your description it does sound more like a sluggish action center.
_________________________
In a seemingly infinite universe-infinite human creativity is-seemingly possible

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#2242153 - 03/06/14 10:59 AM Re: Jack slow to return to its resting state [Re: malte]
BDB Offline
Yikes! 10000 Post Club Member

Registered: 06/07/03
Posts: 21436
Loc: Oakland
Start by wiping off as much of the graphite grease as possible. You may need to use some alcohol to clean it off.
_________________________
Semipro Tech

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