Bedding Blues

[Richard Brekne]

David ilvedson wrote:

> Consider making a cut on the bottom rail and putting in wedge
> which will bow it down?
>

Well... that would help the bow in the middle probably... but then you still
have this offset from the bottom of the balance rail to the crossboard on the
keyframe. I suppose perhaps a combination of your suggestion and Ed's might be
appropriate.

Theres two problems with this keyframe... the bottom of the balance rail is
not flush with the bottom of the keyframe at one crossboard in the middle of
the tenor section.. and this upwards bow in the same area... which is followed
by a general bow upwards from key 50 or so up to the top. Ideally I'd like to
take both bows out, and get the length of the balance rail flush with all
crossboards.

Thanks for the reply..


>
> 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

--
Richard Brekne
Associate PTG, N.P.T.F.
Bergen, Norway