Call for scaling spreadsheets

[Calin Tantareanu]

Hello!
 
I have an Excel scaling spreadsheet too, with a combined graph to show
tensions, Z factor, inharmonicity etc in one place. I have never used it for
actually rescaling a real piano, just to analyze scales.
If you want it, let me know (private mail). 

Calin Tantareanu
http://calin.haos.ro <http://calin.haos.ro/> 
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From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On Behalf
Of Jason Kanter
Sent: marţi, 26 septembrie 2006 23:49
To: Pianotech List
Subject: Call for scaling spreadsheets


List
If any of you have and are willing to share your scaling spreadsheets -
please send to me. In response to Ric Brekne's recent suggestion, I am
offering to use my Excel skills to take a crack at making a nice,
user-friendly, efficient graphing spreadsheet that we can all use to improve
our study and understanding of this area of the craft. I will compile the
best ideas and hopefully come up with something really useful.
 
I don't presently know much about scaling, but I do know Excel and have
access to the "Calculating Technician" Journal series where a lot of this
was discussed.
 
What do you measure, and what formulas do you apply, and what are the
dependencies, constraints and limits? The parameters suggested by Ric
include:
 

Inputs:   
Diameters 
lengths 
type of string material?
 
Outputs:
inharmonicity 
tension
breaking point % 
frequency.
 
For bass strings:
how do you deal with wrapping?
 

And since we will no doubt be looking to improve scaling, what kinds of
what-ifs would you like to automate?
 
I am proposing this as a volunteer project, the output to be freely
available. Maybe that idea creates difficulties since it might "compete"
with commercially available programs. If that's an issue, let me know and
we'll think about it.
 
Jason

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