[pianotech] double-striking hammers on chinese uprights

[tom]

Is it only one key or all? If only one you have an example of a correctly
working assembly on either side (hopefully).  Play the game: What's wrong
with this picture?  The answer should be apparent. Dip, Blow, Checking,
foreign objects, 

Broken - unglued parts as Joe just mentioned - . Let the piano tell you what
is wrong because as we all know the piano never lies. It just fibs a little.

Tom Driscoll

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From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Joseph Alkana
Sent: Tuesday, August 18, 2009 3:12 PM
To: pianotech at ptg.org
Subject: Re: [pianotech] double-striking hammers on chinese uprights

 

Is the jack glued solidly to the whippen?

Joseph Alkana RPT (Retired)

 

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From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Britney Kirk
Sent: Tuesday, August 18, 2009 7:08 AM
To: pianotech at ptg.org
Subject: [pianotech] double-striking hammers on chinese uprights

 

What causes a hammer to double-strike on an upright?  When I play the key,
it feels like there is an extra force at the beginning of the keystroke.
When the keystroke is at the halfway point, the hammer has already hit the
string and started to come back.  When I have finished my keystroke, the
hammer has returned and hit the string once more. 

 

 I have tried re-pinning the hammer flange and doing a finer regulation.
The only thing that seems to help-- but not actually solving the problem,
and creating other problems-- is setting let-off extremely far from the
string.

 

 

Any ideas?

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