Bedding Blues

[Paul]

David
I used this wedging technique on a warped Kawai key frame. The cut(s) was
made in the top of the key frame and veneer was epoxied in the kerf.
Keyframe bedded perfectly and to date there has been no problems with it.

Paul Chick
Plainview MN
----- Original Message -----
From: David ilvedson <ilvey@jps.net>
To: <pianotech@ptg.org>
Sent: Wednesday, February 09, 2000 12:15 PM
Subject: Re: Bedding Blues


> Consider making a cut on the bottom rail and putting in wedge
> which will bow it down?
>
> David I.
>
> Date sent:      Wed, 09 Feb 2000 18:22:45 +0100
> From:           Richard Brekne <richardb@c2i.net>
> To:             "pianotech@ptg.org" <pianotech@ptg.org>
> Subject:        Bedding Blues
> Send reply to:  pianotech@ptg.org
>
> > Hi list
> >
> > Ok.. I got this Schimmel long 6 footer, and it simply wont bed right..
> > lots and lots of spring in the middle tenor (# 25 - 40) which causes
> > this unbelievable bounce in the hammers at rest while playing hard, and
> > causes lots of lost power.. After doing everything possible to correct
> > the bedding and getting nowhere I discovered that the balance rail is
> > way off from flush with the framwork on the keyframe.
> >
> > This particular configuration is such that the balance rail is cut out
> > too accommidate the cross boards of the keyframe, and they should
> > present a flat surface where they are joined. But at key 35 or so on the
> > treble side of the crossboard the balance rail is about 0,70 mm off
> > (away from the keybed).
> >
> > All keyframe screws are tightened down as much as I can get them. For
> > the moment I simply added a 1mm front paper bushing to the area (the
> > balance rail is also warped upwards in the tenor section, and bends
> > upwards and away from the bed again from about key 50 onwards, tho
> > bedding screws take care of that problem)
> >
> > I am wondering what is best to do here... I could install a "sleeper"
> > bedding screw right in the middle of this section, or I could perhaps
> > plane the whole underside flat again,  or perhaps build up the offending
> > part with some laminate..
> >
> > Advice boys and girls ???
> >
> > Richard Brekne
> > Associate PTG, N.P.T.F.
> > Bergen, Norway
> >
>
>
> David Ilvedson, RPT
> Pacifica, CA
> ilvey@jps.net
>