key leveling -- crown?

[Isaac OLEG SIMANOT]

Not only Steinway consider good new keyboard leveling will show a little
arch in the middle.
Klaus Schimmel does too, so Seiler, so other German makers, and their key
bed is not arched.

In fact on Steinway  we may use and arched rule because of the arched keyed
only, they don't pretend it is for the future wear of the balance bushings,
that is other makes that pretend (?) that.
And may be is it only for visual effect !

Regards.

Isaac OLEG

> -----Message d'origine-----
> De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part
> de Carl Meyer
> Envoyé : vendredi 16 novembre 2001 21:07
> À : pianotech@ptg.org
> Objet : Re: key levelling -- crown?
>
>
>
> Yes, Dick , it was Steinway that did that.  However it was done
> to make the
> key level line follow the crown in the keybed, which was put in to ensure
> full contact (spring loaded) of the action frame to the bed.
>
> Had it been to compensate for felt compression, wouldn't it be appropriate
> to have a schedule of releveling according to age or mileage?  Maybe 1/16
> initially, then after 50000 songs we relevel to 1/32.  Then after another
> 50000 songs to1/64?  Now, if the key frame is refelted we must start the
> schedule all over again.  Damm!!! nobody told me that they'd refelted this
> keybed!!
>
> I've been trying to kill this legend for several years now.  It's hard
> because at first glance it seems so "impressive" so "logical" so
> "sophisticated" and it was of course Steinway that did it.  Was it really
> necessary to crown both the bed and the key frame or would it have been
> sufficient to but more crown in the key frame?  Does Steinway
> have a patent
> on that?  I doubt it.  Does any other company use that technique?  I don't
> know of any.
>
> If you haven't guessed yet, I think crowning the key bed is a
> dumb idea.  It
> was a complicated, expensive, confusing and just silly solution to a non
> existent problem.
>
> Maybe they would rather we say bad things about them than to say
> good things
> about some other brand.  Politicians always say "Say anything you
> want about
> me, just don't misspell my name".
>
> Regards
>
> Carl Meyer  Assoc. PTG
> Santa Clara, California
> cmpiano@home.com
>
>
>
>
>
>
> ----- Original Message -----
> From: "Dick Beaton" <rbeaton@initco.net>
> To: <pianotech@ptg.org>
> Sent: Thursday, November 15, 2001 11:17 AM
> Subject: Re: key levelling -- crown?
>
>
> > All...
> > I recall the reason for doing this is that the middle of the piano gets
> > played more than the ends. In time it will even itself out as the felt
> > center rail punchings flatten out more.  As I recall, it was
> Steinway that
> > did this.
> > Dick RPT MT
> >
> > ----- Original Message -----
> > From: Charles Neuman <piano@charlesneuman.net>
> > To: <pianotech@ptg.org>
> > Sent: Thursday, November 15, 2001 9:00 AM
> > Subject: key levelling -- crown?
> >
> >
> >
>
>