Bedding Blues

[David ilvedson]

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