what is downbearing?

[Stéphane Collin]

Thanks Jim.

That makes sense.

Stéphane Collin.



----- Original Message ----- 
From: <JIMRPT@aol.com>
To: <pianotech@ptg.org>
Sent: Saturday, February 21, 2004 2:50 AM
Subject: Re: what is downbearing?


> In a message dated 2/20/04 5:56:09 PM Eastern Standard Time,
> collin.s@skynet.be writes:
>
> <<  Problems arise in the 3 last
>  octaves of most pianos I see, and there any reading (even string length)
is
>  subject to caution.  Help !
>   >>
>
> Stéphane....The problem in these octaves is more typically
> soundboard/impedance problems and no amount of accurate downbearing magic
will cure it. :-(
>
> <>
>
>  Difinitely not "irrelevant" but it is not alchemy or sorcerers work
either.
> What you are shooting at in adjusting for down bearing is a moving target
not
> a static one. There is a range where any downbearing within that range,
for
> one particular piano, will produce excellent tone...That is the range to
shoot
> for and inaccuracies of  small magnitudes are not going to effect the
overall
> result. Downbearing forces change with changes in temperature, humidity,
tuning
> pitch, whether any strings are broken, etc........  So we are shooting at
a
> moving target and no one is going to be able to give you the magic formula
for
> "exact" downbearing force or downbearing angle which will work on all
pianos
> and most times won't work optimally on pianos, of the same model, which
come
> off the production line one after the other.
>
>
>  << But I would like to change my views also, and know
> exactly how much downbearing I should put on my next rebuild job, and how
I
> could accurately (enough) measure it.>>
>
>  Great!!! When you get it worked out, patent it, and I will market it for
> you!! :-)
> Until then, measuring each piano shaped thingee, and then making a SWAG,
will
> get
> you in the ballpark.......... cause you won't forget your mistakes
quickly!
> :-).
> Jim Bryant (FL)
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
>
>