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#629932 - 08/06/07 08:53 AM Let-off allowance for practice pedal felt
Digitus Offline
500 Post Club Member

Registered: 11/08/06
Posts: 866
Loc: Singapore
I am about to adjust the let-off across the entire keyboard on my K-8 because of problems I have been having with double-strikes when playing ppp. This is because the let-off on the affected keys has been set so that the hammer is just touching the strings when the escapement occurs.

I notice that in general the let-off distance is much closer than the 1/8" recommended by Reblitz. Reblitz also suggests that if there is a practice pedal felt present that the let-off should be adjusted to within 1/8" of the felt when the practice pedal is depressed.

What should it be? The way Kawai has adjusted it (at least on my piano) or the way that Reblitz suggests that it be done?

But Kawai clearly sets the let-off distance without allowing for the practice pedal felt.

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#629933 - 08/06/07 10:54 AM Re: Let-off allowance for practice pedal felt
Dave Stahl Offline
1000 Post Club Member

Registered: 05/06/07
Posts: 1645
Digitus,

The letoff on Kawai upright actions should be set to 2-3mm.

Letoff distance and other facets of regulation are not static. Climate change and playing will alter the factory regulation pretty quickly.

When the actions are new, the felt on the letoff buttons will begin to compress, causing the jacks to contact the buttons later, in turn causing some bobbling due to the later letoff.

Check the lost motion, too. I'll bet the capstans need regulation as well.
_________________________
Promote Harmony in the Universe...Tune your piano!

Dave Stahl, RPT
Piano Technician's Guild
San Jose, CA
http://www.youtube.com/watch?v=JAniw3m7L2I
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#629934 - 08/06/07 10:55 AM Re: Let-off allowance for practice pedal felt
Dave Stahl Offline
1000 Post Club Member

Registered: 05/06/07
Posts: 1645
...and as for the practice felt, I really wouldn't worry about adding extra letoff distance. It won't hurt anything, but the piano will be less responsive during ppp playing.
_________________________
Promote Harmony in the Universe...Tune your piano!

Dave Stahl, RPT
Piano Technician's Guild
San Jose, CA
http://www.youtube.com/watch?v=JAniw3m7L2I
http://dstahlpiano.net

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#629935 - 08/06/07 11:30 AM Re: Let-off allowance for practice pedal felt
Digitus Offline
500 Post Club Member

Registered: 11/08/06
Posts: 866
Loc: Singapore
Hi Dave,

Thank you very much for the quick reply. Much appreciated.

The lost motion seems fine. You may be right about the capstans, because some keys don't seem to stroke as smoothly as others. But that could be my imagination.

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#629936 - 08/06/07 02:21 PM Re: Let-off allowance for practice pedal felt
Dave Stahl Offline
1000 Post Club Member

Registered: 05/06/07
Posts: 1645
When playing really softly, particularly on the treble side near the bass break, you may feel some resistance as the dampers pull out of the strings. I'm talking about the tricord dampers, the ones with he fingers that go in between the strings. This can cause a slightly uneven feel in that area.

Lost motion is regulated via the capstan.

I don't know if you're a tech or not, but you seem to be inclined to work on your piano. If you aren't a tech, you might want to have someone with more experience show you what to look for to diagnose regulation problems and how to perform the various adjustments. These are things that most techs can regulate quickly and efficiently, often at regular service calls.
_________________________
Promote Harmony in the Universe...Tune your piano!

Dave Stahl, RPT
Piano Technician's Guild
San Jose, CA
http://www.youtube.com/watch?v=JAniw3m7L2I
http://dstahlpiano.net

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