grand hammer hanging question

[Isaac sur Noos]

Hello Jon,

Nice to read you, I hope you're doing fine.

I'd check the global geometry to understand the letoff problem. Are
the action rail wood ? how is the spread ?

Are the parts original ? I've seen hammers badly hanged even on
prestigious brands, so everything is possible, but the piano when new
was certainly not regulated like this so where does the problem come ?
Where the rollers changed for biggest ones ?
Can you obtain a good drop ?

Have you checked with Kawai original specs ?

Kawai are generally over centering by 2-3 mm , for what I know, this
make repetition better , but less evident to have a "clear touch" - a
good touch is generally obtained with a very small drop.
You could, shim under the hammer rail to get where you want (have it
higher), drilling hammers longer, as David say, mean the rake angle
change and the strike point for the treble  will have to be double
checked - it shorten the tails also, and traveling is harder with tall
heads.

I did not understood what model it was

Good luck - take care.

Euro Greetings

Isaac

------------------------------------
Isaac OLEG
accordeur - reparateur - concert
oleg-i@noos.fr
19 rue Jules Ferry
94400 VITRY sur SEINE
tel: 033 01 47 18 06 98
fax: 33 01 47 18 06 90
mobile: 033 06 60 42 58 77
------------------------------------


> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Jon Ralinovsky
> Envoye : mardi 11 novembre 2003 16:02
> A : davidlovepianos@earthlink.net; Pianotech
> Objet : RE: grand hammer hanging question
>
>
> Hi David,
> The piano wouldn't regulate in that the let-off buttons
> were all the
> way up, but the let-off was still in the 1/4" range.
> Thanks for the
> reminder about the bass hammers clearing the pinblock; I'll
> take the
> action back to the piano before installing the hammers to check on
> the strike point and the clearance.
>
> Respectfully,
> Jon
>
> >In what way would the action not regulate?  Have you
> checked to be sure
> >that the bass hammers will go in under the pinblock with
> the added length?
> >If you have changed the bore distance, you have changed
> the strike point so
> >it is important that you test this in the piano before you
> glue everything
> >up.  It is worth a trip back to the piano if you are not
> sure.  There is no
> >law which says that all hammers must be hung at the same
> distance, but it's
> >not a bad idea to aim for it.  The bass and tenor are not
> sensitive to
> >strike point the same way the treble is but I would be
> concerned about
> >adding so much length to the bore.  If there is an
> overcentering problem,
> >you can always rake the hammers back a little.  Some
> makers, by the way,
> >set hammers up to overcenter just slightly for various reasons.
> >
> >David Love
> >davidlovepianos@earthlink.net
> >
> >
> >>  [Original Message]
> >>  From: Jon Ralinovsky <ralinoj@muohio.edu>
> >>  To: <pianotech@ptg.org>
> >>  Date: 11/11/2003 4:59:22 AM
> >>  Subject: grand hammer hanging question
> >>
> >>  Hello,
> >>  I'm rebuilding the action for a 1968 Kawai Model 600
> (6' long).  The
> >>  hammers are hung in a straight line, but the distance
> from the hammer
> >>  flange center pin to the center of the hammer molding
> tapers from 4
> >>  7/8" in the treble to 5" in the bass.  The top hammers
> sounded decent
> >>  before I took the action out of the piano;
> unfortunately, I didn't
> >>  check the case parts to see if I could move the action
> in or out.  Is
> >>  there any reason that I shouldn't duplicate the
> original specs?  Is
> >>  it important that all the hammers are hung at the same
> distance from
> >>  the hammer flange center pin?  If it makes any difference, I did
> >>  change the bore distance of the hammers from 2 3/16" to
> 2 3/8" in the
> >>  bass and from 1 7/8" to about 2 1/8" in the treble;
> this was done due
> >>  to the hammers overcentering and the action not being able to be
> >>  regulated.  I look forward to your responses.
> >>
> >>  Respectfully,
> >>  Jon
> >>
> >>  --
> >>  Jon Ralinovsky
> >>  Piano Technician
> >>  Department of Music
> >>  Miami University
> >>  513/529-6548
> >>  _______________________________________________
> >>  pianotech list info:
> https://www.moypiano.com/resources/#archives
> >
> >
> >
> >_______________________________________________
> >pianotech list info: https://www.moypiano.com/resources/#archives
>
>
> --
> Jon Ralinovsky
> Piano Technician
> Department of Music
> Miami University
> 513/529-6548
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
>