[pianotech] Modified L Scale with 5 note transition

[David Love]

I think I took my Z formula from Roberts.  It's all calculated from the
string data, not from the board.  There are a couple of formulas for this
particular factor and nobody seems 100% satisfied with how the data output
relates to the actual sound produced.  Others may be able to contribute more
to the formulaic issues.  I input the data so long ago now that I've
conveniently forgotten the headache I got trying to translate the formula
into spread sheet language.  

David Love
www.davidlovepianos.com


-----Original Message-----
From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Gene Nelson
Sent: Thursday, May 28, 2009 9:14 AM
To: pianotech at ptg.org
Subject: Re: [pianotech] Modified L Scale with 5 note transition

I have read how Del Fandrich describes Z = the square root of springiness 
multiply by inertia.
Inertia should be a simple Newtonian mass measure - do you weigh the board?
How do measure springiness - it could only come from the ribs - am I on the 
right track?
How do you get this onto spreadsheet?
Gene
----- Original Message ----- 
From: "Ron Nossaman" <rnossaman at cox.net>
To: <pianotech at ptg.org>
Sent: Thursday, May 28, 2009 8:57 AM
Subject: Re: [pianotech] Modified L Scale with 5 note transition


David Love wrote:
> Speaking of modifying scales.  Don't know how much of this will come
> through but here's an example of a modified L scale with a  5 note
> transition bridge that I'm playing with.  You can see the shape of the
> bridge by the purple line showing the speaking lengths, the five note
> transition is seen where the drop in inharmonicity is.  The goal is
> balancing tension (red), impedance (grey) and inharmonicity.  The blue
> line at the bottom indicates break point %.

Here's what my last one looked like.
Ron N