grand action problem

[Quentin Codevelle]

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Hi Jon,

could you explain to those whose native language is not english what KR =
is?

Thanks,

Quentin



Jon page wrote:

Start with routine measurements:

String height for each section
Hammer center height on #'s 1 & 88

(String height) - (hammer center height) =3D Bore Distance

This will let you know if the hammers are too short.  Look at the string =

impressions in the crown, are they fairly centered?
Are the knuckles flattened out?  Bolstering them will get your L/O =
closer.

Action spread should be probably somewhere between 112.5 mm & 113.5 mm.=20
Blow distance 46mm. Key Dip 10mm.

  As Ric mentioned, bed the key frame. Recheck action parameters.

Is there superfluous after touch now, because if it is minimal then=20
bringing the L/O up will decrease that.
In other words, if the jack is far away from the knuckle when the key is =

fully depressed then there is
tolerance for the L/O to raise. If the jack is in very close proximity =
to=20
the knuckle then you have to deal with
action measurements or KR.

Have you taken touchweight measurements?  If they are low (light touch) =
I=20
would suspect KR.

Best of Luck,

Regards,

Jon Page, piano technician
Harwich Port, Cape Cod, Mass.
mailto:jonpage@comcast.net
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