Negative bearing

[David Love]

Measurements were taken with a Lowell component gauge.  Leveled on top of
the bridge and taken on either side.  The board shows about 1/8" - 3/16"
crown in the middle of the board when a string is stretched along the long
rib.  The piano sounds pretty good.  Reasonable power and sustain throughout
even with old and corroded strings and original hammers.  Bass is a little
harder to tell because the strings a bit tubby, but overall the board seems
pretty lively.


David Love


----- Original Message -----
From: "Ron Nossaman" <RNossaman@KSCABLE.com>
To: <pianotech@ptg.org>
Sent: November 30, 2001 7:49 PM
Subject: Re: Negative bearing


>
> >
> > I'm restringing a Steinway A (6'4") c 1925.  The bearing measurements
are as
> > follows:
> >
> > Note #           80         60         40        22         10
> > Front         +.030    +.018    +.012    .000      .000
> > Back          -.018    -.012     +.006     .000   +.015
>
>
> First, How were these figures obtained? Bearing measured from where to
where,
> by what method, over what span? And once again - what's the crown
measurement
> of the soundboard in these spots, and how does the original sound?
>
> Ron N
>