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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
2000 Post Club Member

Registered: 01/24/10
Posts: 2297
Loc: Montreal, Quebec, Canada

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

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

Registered: 01/12/10
Posts: 829
Loc: Boone, Iowa, USA

Hi - I would suggest trying a drop of CPL on the pivot point. Chuck Behm
Tuner/Technician/Rebuilder/Technical Writer

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

#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: 397
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?

Jon Page
Piano technician/tuner
Harwich Port, Cape Cod, Massachusetts, USA

#2242152 - 03/06/14 10:55 AM Re: Jack slow to return to its resting state [Re: malte]
Ed McMorrow, RPT Offline
3000 Post Club Member

Registered: 12/09/12
Posts: 3100
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.
Contact: Ed@LightHammerpiano.com

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

Registered: 06/07/03
Posts: 22973
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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