Call for scaling spreadsheets basics

[ed440 at mindspring.com]

This can be a very useful project.
I suggest beginning with a plain wire tension and inharmonicity calculator.
This introduces the basic formula which can be extended later for bass string design.
A graphing plain wire calculator can show when the problems of crossing the break cannot be solved with plain wire, and where wound strings must be introduced. 
At this point you can send the measurements to Arledge or Isaacs who will do the bass scaling at no extra charge.  Change the agraffes, add some hitch pins if needed, plug, drill, notch and repin for the wound bichords and you will make a very big improvement in a short scaled piano. 
You can also use the plain wire calculator to check the treble scaling, especially useful if the previous stringing was sloppily done.
If everyone restringing pianos did just this, there would be a big improvement in the quality of restringing work being delivered to the trusting public.  
Designing bass strings and transition bridges comes after the plainwire.
Ed Sutton

-----Original Message-----
>From: Leslie Bartlett <l-bartlett at sbcglobal.net>
>Sent: Sep 30, 2006 5:48 PM
>To: 'Pianotech List' <pianotech at ptg.org>
>Subject: RE: Call for scaling spreadsheets
>
> 
>
>
>I think if we go back to the origional post in this thread we will see that
>we (Jason, myself, and a couple others) were asking for basic spreadsheets
>for figuring stringing scales so we could put together an excell file that
>could serve as a basis for any interested list members to start learning
>about rescaling.
>
>So... if you have an appropriate scaling spreadsheet or commentary that
>sticks to this purpose... by all means help out.
>
>Hope this can serve to help steer the discussion back on topic.
>
>Cheers
>RicB
>
>	Personally the math and theory on scaling is just mind boggling.
>Some of us get forced to do an occasional restringing, and even a rebuild of
>some sort.   Many of us KNOW we lack theoretical knowledge to mess with
>bridges, bellies, calculating for new downbearings, etc. etc. etc. Ad
>Nauseum.  Presumable we, the ignorant should stay away from the domain of
>the esoteric experts.   However pragmatics of finances and a lot of other
>things puts us everyday technicians in a difficult place. We are asked to DO
>WORK on peoples' pianos, and anything which would aid us to be responsible,
>not ripping people off, even though we know we will not rise to the heights
>of the greatest, would be a tremendous help.   So, if it were possible to
>have some basic tool which would allow us to deal with the piano basic
>framework as-is, and yet make some modest improvements I would be overjoyed.
>les bartlett
>
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