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#2269181 - 04/30/14 05:28 PM What is the rest position of a hammer really?
malte Offline
Junior Member

Registered: 01/19/14
Posts: 8
If I strike a key so that the hammer checks and then release, then depending on how quickly I release the rest position of the hammer fluctuates by sometimes 2mm. I'm sure that the repetition spring is strong enough, although increasing its strength to unreasonable levels reduces the problem to less that 1mm fluctuation. Is this normal? If yes, how do I set the hammer height? If not, what else could cause this problem?

Best wishes!

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#2269224 - 04/30/14 06:49 PM Re: What is the rest position of a hammer really? [Re: malte]
Gene Nelson Offline
1000 Post Club Member

Registered: 09/10/04
Posts: 1464
Loc: Old Hangtown California
Wink the jacks while key is in the rest position. Should be just enough lost motion to allow the jack to reset when key is at rest and jack tail is slowly released. Don't let this lost motion get excessive.
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RPT
PTG Member

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#2269231 - 04/30/14 06:57 PM Re: What is the rest position of a hammer really? [Re: malte]
A443 Offline
500 Post Club Member

Registered: 04/28/12
Posts: 898
Loc: Vienna-Houston-Tokyo
...wait, what now? Are you talking about an upright, or a grand?

It sounds like a grand...with the repetition lever set too high (i.e., in relation to the jack), and an inconsistent spring tension among the wippens. More info please...
_________________________
Klavierbaukünstler

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#2269291 - 04/30/14 09:12 PM Re: What is the rest position of a hammer really? [Re: malte]
Mark Cerisano, RPT Online   content
1000 Post Club Member

Registered: 01/24/10
Posts: 1072
Loc: Montreal, Quebec, Canada
Why is this a problem?
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Mark Cerisano, RPT
www.howtotunepianos.com

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#2269331 - 04/30/14 10:33 PM Re: What is the rest position of a hammer really? [Re: malte]
BenP Offline
Full Member

Registered: 01/16/12
Posts: 163
Loc: South Jersey
There will always be some minimal variance in both the checking position and the rest position based on how hard you strike the key and how quickly you release it. I'm with Mark C - why is it a problem?


Edited by BenP (04/30/14 10:34 PM)
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Ben Patterson
Part-time Piano Tech
Rural South Jersey

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#2269430 - 05/01/14 04:41 AM Re: What is the rest position of a hammer really? [Re: malte]
malte Offline
Junior Member

Registered: 01/19/14
Posts: 8
Thank you for taking the time and: sorry, its a grand piano. Lost motion should be ok. If I slowly depress the jack tenders, the hammer barely moves. Sometimes I have the feeling that some hammers don't move up as much as they move down when I release the jack again.

This is a problem when setting hammer height. The hammer blow distance is, by definition, the distance between the hammer tips at rest position and the strings. But in my case, hammer height fluctuates depending on how I struck the keys prior to regulation...

@A443: I don't understand. How would the hammer height of a particular hammer be affected by different spring tension on the adjacent wippens?

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#2269444 - 05/01/14 05:45 AM Re: What is the rest position of a hammer really? [Re: malte]
A443 Offline
500 Post Club Member

Registered: 04/28/12
Posts: 898
Loc: Vienna-Houston-Tokyo
no, not the adjacent wippen...

If your repetition spring is inconsistent (i.e., meaning, mainly weak) and the leaver is set too high, then you would get the situation that you are describing.

There could also be too much friction somewhere in the system.
_________________________
Klavierbaukünstler

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#2269446 - 05/01/14 05:52 AM Re: What is the rest position of a hammer really? [Re: malte]
A443 Offline
500 Post Club Member

Registered: 04/28/12
Posts: 898
Loc: Vienna-Houston-Tokyo
regardless, no: it is not normal. You will find a problem somewhere

Check the hammer flange pining to see if it is too tight...
_________________________
Klavierbaukünstler

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#2269496 - 05/01/14 08:34 AM Re: What is the rest position of a hammer really? [Re: malte]
Olek Offline
7000 Post Club Member

Registered: 03/14/08
Posts: 7266
Loc: France
Friction plus whippen assist springs can easily create some unstable hammer rest posture.

The knuckle is supported by the lever and the jack, then the position of the jack and its shape on its top, can influence the hammer rest much.
_________________________
Isaac OLEG - http://picasaweb.google.fr/PianoOleg pro

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