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What is the technical name for this problem?
#2531746 04/18/16 01:15 PM
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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.

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Re: What is the technical name for this problem?
Jenista #2531758 04/18/16 01:59 PM
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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?
Jenista #2561597 08/07/16 11:27 AM
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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?
Jenista #2561598 08/07/16 11:28 AM
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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?
Jenista #2563019 08/14/16 12:11 AM
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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?
Jenista #2576758 10/06/16 11:49 PM
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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?
Jenista #2599846 01/01/17 11:12 AM
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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?
jayr #2870396 07/18/19 05:16 PM
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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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