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What is the technical name for this problem? #2531746
04/18/16 01:15 PM
04/18/16 01:15 PM
Joined: Dec 2013
Posts: 6
Massachusetts
J
Jenista Offline OP
Junior Member
Jenista  Offline OP
Junior Member
J

Joined: Dec 2013
Posts: 6
Massachusetts
I just recently purchased a used Kawai that is about 40 years old. I had a technician check it out first, and he said it just needed tuning, and minor pedal repairs. So I had that done, and while the tone does sound pretty good, it does this really annoying thing occasionally and inconsistently. Sometimes when I strike a key (random keys, although one in particular), it does a double bounce off the string, so it sounds...I don't know how to describe it, the word warbled comes to mind. I assume there is a proper name to describe this phenomenon. What causes it, and how is it fixed? Is it something to do with the felt? I had it tuned shortly after it arrived at my house, and I assumed this would be fixed as part of the tuning process.

Piano & Music Accessories
Re: What is the technical name for this problem? [Re: Jenista] #2531758
04/18/16 01:59 PM
04/18/16 01:59 PM
Joined: May 2004
Posts: 864
Boston, MA
B
bellspiano Offline
500 Post Club Member
bellspiano  Offline
500 Post Club Member
B

Joined: May 2004
Posts: 864
Boston, MA
You might want to re-post this in the Tuner-Technicians Forum -- the regular forum, not the "frequently asked questions" section. You will get more answers and suggestions posting there.


Dorrie Bell
retired piano technician
Boston, MA
Re: What is the technical name for this problem? [Re: Jenista] #2561597
08/07/16 11:27 AM
08/07/16 11:27 AM
Joined: Nov 2015
Posts: 84
Lagos, Nigeria, West Africa
I
Israel Bright Offline
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Israel Bright  Offline
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I

Joined: Nov 2015
Posts: 84
Lagos, Nigeria, West Africa
It is most likely to be 'hammer bubbling'...the hammer plays twice of some sort when the key is struck?

Re: What is the technical name for this problem? [Re: Jenista] #2561598
08/07/16 11:28 AM
08/07/16 11:28 AM
Joined: Nov 2015
Posts: 84
Lagos, Nigeria, West Africa
I
Israel Bright Offline
Full Member
Israel Bright  Offline
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I

Joined: Nov 2015
Posts: 84
Lagos, Nigeria, West Africa
It is most likely to be 'hammer bubbling'...the hammer plays twice of
some sort when the key is struck?

Re: What is the technical name for this problem? [Re: Jenista] #2563019
08/14/16 12:11 AM
08/14/16 12:11 AM
Joined: Aug 2016
Posts: 4
N
NickHollis Offline
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NickHollis  Offline
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N

Joined: Aug 2016
Posts: 4
This is called double striking. This is caused when the backcheck does not catch the hammer at the end of the action cycle. This can be fixed by carefully bending the backcheck forward. The hammer should catch on the backcheck 1/2" to 5/8" from the string. I would have your local piano technician take care of this simple fix. Is your Kawai an upright or a grand?

Nick


Senior technician at: http://antiquepianoshop.com/
Re: What is the technical name for this problem? [Re: Jenista] #2576758
10/06/16 11:49 PM
10/06/16 11:49 PM
Joined: Aug 2011
Posts: 75
Middle Tennessee
jayr Offline
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jayr  Offline
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Joined: Aug 2011
Posts: 75
Middle Tennessee
I call it double striking or double bouncing. It can be fixed by bending the back check, but the problem with that is you may make the back check "catch" the hammer as it rises to the string. Regulation is a much better choice when dealing with a double bounce.



Jay
Jays Piano Tuning Service
www.jays-piano-tuning.com




Re: What is the technical name for this problem? [Re: Jenista] #2599846
01/01/17 11:12 AM
01/01/17 11:12 AM
Joined: May 2007
Posts: 1,939
Scotland
D
David Boyce Offline
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David Boyce  Offline
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D

Joined: May 2007
Posts: 1,939
Scotland
It's also called "hammer bobbling" or (in the UK in times past) "blubbering". Double-striking is the best technical term for it.

Re: What is the technical name for this problem? [Re: jayr] #2870396
07/18/19 05:16 PM
07/18/19 05:16 PM
Joined: May 2012
Posts: 477
UK
G
Goof Offline
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Goof  Offline
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G

Joined: May 2012
Posts: 477
UK
Beside the back-check not catching it can also be that jack is not clearing the but of the hammer - thus the hammer is bounced back. Also the tape, which pulls the hammer, back may be slack.
I take it that it is an upright piano ?
If you are going to try on your own to fix the problem - look for videos on YouTube there are at least two showing on models how to do things.


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