Reading a Board

[Farrell]

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Bill Ballard wrote:

"That judgement call aside, it's still interesting that things should=20
look so good from the top side. I know when a crown has reversed and=20
bridges have rolled that such a board can give false positives  on=20
downbearing. But I would expect that to be accompanied by badly=20
negative front bearing. Which is not the case here."

I would argue that reports suggest that "badly negative front bearing" =
is indeed the case:

"...at the mid-treble break where front bearing disappears..."

If it ain't right, it ain't right!

Terry Farrell

----- Original Message -----=20
From: "Bill Ballard" <yardbird@vermontel.net>
To: <pianotech@ptg.org>
Sent: Saturday, October 04, 2003 12:26 AM
Subject: Reading a Board


> Dear List,
>=20
> I have a 110 -year-old B with a 35 year old board (NY: Camilleiri?=20
> A&C?), with whose voicing I've hit the "wall". This is the main=20
> concert piano for one of my summer music programs, and the piano=20
> lives over the winter in the uninsulated concert shed. I believe=20
> (based on 8 years of taking care of this piano) that I've hit on the=20
> best musical use of the resonance in that board, but still the 5th=20
> and 6th octaves never balance satisfactorily with the rest of the=20
> piano. (35 y.o. board & block, 15 y.o. stringing, and 6 years ago, I=20
> put new action parts - NY hammers. This summer I did sell them=20
> Pianotek's turnbuckle brace.)
>=20
> Underneath, the crown has collapsed. I've got an M-shaped board: the=20
> bridge has pressed a downwards ridge into the soundboard, all along=20
> the treble bridge, except when the bass bridge stands behind it=20
> (between ribs #2-5 counting from the bass corner). Here the long=20
> bridge has crown under it, and it's the bass bridge which furrows the=20
> board. The board BTW, doesn't show compression ridges.
>=20
> On top, there's respectable downbearing *and* front bearing=20
> throughout (the only exception to front bearing is at the mid-treble=20
> break where front bearing disappears, but downbearing is still=20
> respectable.
>=20
> Having listened to some fine new factory fresh Bs at Marlboro this=20
> summer, this board's resonance needs to be better. Based on the crown=20
> readings, I'd tend to say that we shouldn't expect anything better=20
> from this board.
>=20
> That judgement call aside, it's still interesting that things should=20
> look so good from the top side. I know when a crown has reversed and=20
> bridges have rolled that such a board can give false positives  on=20
> downbearing. But I would expect that to be accompanied by badly=20
> negative front bearing. Which is not the case here.
>=20
> Bill Ballard RPT
> NH Chapter, P.T.G.
>=20
> "Trust me, you've got all the equipment, You just need to read the =
manual"
>      ...........Reese Witherspoon in "Legally Blonde"
> +++++++++++++++++++++
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives
> 
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