Killer Octave & Pitch Raise

[David Love]

I'm still not seeing it.  If you roll the ball over slightly to the
right, the highest point will move to the left (farther back), but the
overall curve will not have changed.  It seems to me that the thing that
differentiates the amount of curve (rib radius aside) is the width of
the board at any particular point and the amount of expansion that can
take place across the grain.  The problem of multiple radii within a
board, it would seem, is easily addressed by crowning the ribs
accordingly.

David Love
davidlovepianos@comcast.net 

-----Original Message-----
From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On
Behalf Of Arnold Duin
Sent: Saturday, February 12, 2005 1:43 PM
To: Pianotech
Subject: Re: Killer Octave & Pitch Raise

You have to see it in a horizontal way. Hope this drawing will help a
bit.

Mr. Klaus Fenner uses two radii one from the highest point to bass side 
(diagonal) and another one to treble side which is smaller of course.
The 
same for the curvature of the front belly rail.

Greetings

Arnold




> Not sure I understand this, if you drop the soundboard on a perfect
> sphere, the high point will always be the same no matter which way you
> place it.
>
> David Love
> davidlovepianos@comcast.net