Bedding Blues

[David ilvedson]

Yeah, If you wedge from the bottom it forces it up...oops....

David I.

From:           	"Paul" <tunenbww@clear.lakes.com>
To:             	<pianotech@ptg.org>
Subject:        	Re: Bedding Blues
Date sent:      	Wed, 9 Feb 2000 13:34:56 -0600
Send reply to:  	pianotech@ptg.org

> 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
> >
> 
> 


David Ilvedson, RPT
Pacifica, CA
ilvey@jps.net