Kawai keyframe leveling

[Isaac OLEG]

Joe, I concur, why not glides.

The KG series seem to have a permanence in warping may be not the
front rail but more probably the keybed himself. I have one that
change a lot from winter to summer, despite planning, precise fitting,
etc. They often have been planed with a rabbit on the left and right
of the front rail because  of central knocking, and that produce these
new knocks at another moment.

I'd add the glides on the keybed, not on the front rail (to be
regulated with a screwdriver from below).


Care may be taken then to plane the underside of the rail, as the
actual contact surface is not that large.

On the other hand, bedding with the gauge method these pianos helps,
as the zone accepted between not enough pressure and too much (front
rail not touching, is very small 1 mm of key height I'd say)

The use of a piece of adhesive tape (Scotch) is perfect for little
warpage or knocks, but on these KG it is not enough most of the time.

Nowadays, most of the grands need touch up at the glide bolts when we
tune them.



Isaac OLEG

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> -----Message d'origine-----
> De : pianotech-bounces@ptg.org
> [mailto:pianotech-bounces@ptg.org]De la
> part de Joseph Garrett
> Envoyé : mardi 10 juin 2003 18:59
> À : pianotech@ptg.org
> Objet : Kawai keyframe levelling
>
>
> Bruce,
> I would definately add "glides" for the front rail. You'll
> need a "Fortsner"
> bit to drill the "inset". You could use a "Spade" bit, to
> get the "inset"
> started, but they are a bit brutal to the wood. Try
> drilling with the
> "Spade" bit, just enough to give the "Forstner" something
> to guide on.
> Switch to the "Fortsner", to get to the proper depth. Then,
> (centering on
> the "dimple" left by the "Fortsner"), use a regular drill
> to drill for the
> threaded stem. It's a good idea to do a test on a scrap
> piece of wood, to
> make sure the stem hole will be the correct tightness, etc.
> I would "equal"
> the glides, as there are in the center rail, so that they
> are in line,
> (approximately), with each other. In other words, if the
> balance rail has 6
> glides, then the front should have 6. It'll take a bit more
> time to get that
> system to "balance", but in the future, you'll have it
> (un-)knocked. <G>I
> must say the "thumb tack" trick is quite ingenious!<G>
> Best Regards,
> Joe Garrett, RPT, (Oregon)
>
> Been There, Didn't Like It, So I'm Here To Stay! [G}
>
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