Kawai bedding response (could be humor)

[Isaac OLEG]

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MessageBruce, that is the list, things are easily perceived different from
what they are intend to !

Don gives a good very true and honest iadvice there. That correspond well
with what I've find on these pianos.

The French tech from Kaway told me that front bedding occur a tad more often
than wished. When new they have been done right generally, but where does
this instability (to high fluctuations) come from ?

Many KG2 are kerfed, may be from the start, but the kerfs are not filled.
Despite that they move,  I have not thought of trying to bed them presently
in winter, a good point.

Many Steinway are knocking, Yamahas too are to be bedded day in day out,
this is less worrying me with time...

Greetings.

Isaac OLEG

Entretien et réparation de pianos.

PianoTech
17 rue de Choisy
94400 VITRY sur SEINE
FRANCE
tel : 033 01 47 18 06 98
fax : 033 01 47 18 06 90
cell: 06 60 42 58 77
  -----Message d'origine-----
  De : pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org]De la
part de bruce greig
  Envoyé : jeudi 12 juin 2003 19:19
  À : Piano Tech List
  Objet : Kawai bedding response (could be humor)


  I found this amusing, guess Don didn't take it that way.


  ----- Original Message -----
  From: bruce greig
  To: Don Mannino
  Sent: Wednesday, June 11, 2003 10:26 PM
  Subject: Re: Kawai KG2D #1582033



  Thanks, Don, you do realize what your're saying here..........

  I have to say, though, that this sounds like the piano only needs a
thorough, back front and balance bedding.  Rather than trying to do a quick
re-adjustment, allot the time to do the whole job and you will likely find
that the problem will be solved.  When we hear this kind of "It's always
been this way" complaint, this almost always means that no one has taken the
time to properly bed it.

  don't you?

  Bruce
    ----- Original Message -----

    From: Don Mannino
    To: 'bruce greig'
    Sent: Tuesday, June 10, 2003 6:52 PM
    Subject: RE: Kawai KG2D #1582033


    Bruce,

    Kawai keyframes should be bedded flat with no pressure on the keyframe
guide pins.  Generally if this is done during a dry time, the keyframe will
stay knock-free during humid weather, but extreme conditions can cause the
keyframe to move one way then the other with the seasons.  Adjusting the
balance rail glides will not stop front rail knocking (unless they have been
grossly misadjusted), and your message does not make it clear why you would
adjust the glides to stop knocking, then be concerned about pressure on the
guide pins for the front rail.

    Repeated re-beddings can cause the front rail lip on the bottom to be
worn away, so that black keys will always knock on hard blows and it is
difficult to re-bed things.  In this case, you should glue a strip of hard
wood veneer along the front edge, about 1/4" wide or so.  This can be done
only at the ends if needed, or along the full length of the rail.  Use
aliphatic resin glue, then iron it down with a warm iron and wax paper.

    After the rail lip has been rebuilt, a lot of sanding and re-bedding
should be done.  You say you are familiar with keyframe bedding procedures,
so I don't need to give you details for redoing the keyframe back, front and
balance rails.  The key dip should also be reset if the front rail is
thickened.

    If the location of this piano has extremes which require key block hold
downs, you should be able to use the RX style keyframe guide blocks.  This
should not be done until after the keyframe itself is well bedded, though.

    In some extreme cases the keyframes have needed kerfing and wedging, but
this is pretty rare.  If the front rail lip is still in good shape, and the
keyframe ends warp up 1/4 in the winter, then getting it kerfed flat will
make it flat for you.


    I am in Japan this week, but Nick Gravagne and Andrew Thomas are in the
office if you want to call and talk to one of them about this.  The number
is (800) 421-2177.

    Don Mannino RPT, Manager
    Kawai Piano Technical Support, US and Canada
    dmannino@kawaius.com
    www.kawaius.com

      -----Original Message-----
      From: bruce greig [mailto:bgreig@nyc.rr.com]
      Sent: Tuesday, June 10, 2003 12:30 PM
      To: acoustic2@kawaius.com
      Subject: Kawai KG2D #1582033


      I've been servicing the above piano for about two years.  According to
the owner, it has always had a problem with keyframe knocking and even after
glide adjustments, the knocking always returns.  I've also found this to be
true.  On my last visit, repeated attempts at glide adjustments including
the ones reachable only from the underside, were fruitless.  I also observed
that the treble keyend block was not even touching the keyframe guide pin.
Please note that I am well experienced with keyframe levelling procedures.

      My questions now are: should this piano have front rail keyframe or
keybed glides installed and can you provide those parts (ones similar those
on the underside of the center rail.) with directions for installation?

      and, what approach do you advise for the ineffectual key end block
situation? As a stopgap, I put a couple thumbtacks on the underside of the
front rail, which has stopped the knocking.

      I will be preparing this piano on Friday for performance use and would
appreciate any advice asap.

      Thank you.
      Bruce Greig, PTG, RPT

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