(Fwd) Re- Piano Rescalin

[Ted_Sambell@BanffCentre.AB.CA]

                      RE>(Fwd) Re: Piano Rescaling Software        6/7/96
Rob,
We found that the slowest operation in measuring strings was the lengths
until we acquired a Starret digital tape measure. It can be set to metric
or English or to include the case width. You simply stretch it to the
speaking length (including the case width) and read the LCD. Best done with
two people. Denis and I can do a whole piano in fifteen minutes; it used to
take upwards of an hour. If you wanted to go the expensive route to measure
the diameters you could use one of the digital calipers  with  a printer
port and output to a portable printer. So far we have balked at this but
have thought about it.
Nice to be reading your posts!

Best wishes, Ted Sambell.
--------------------------------------
Date: 6/6/96 21:00
To: Ted Sambell
From: pianotech
------- Forwarded Message Follows -------
From:          Self <rob>
To:            XSVM93A@prodigy.com (MR ALLAN H DAY)
Subject:       Re: Piano Rescaling Software
Date:          Thu, 6 Jun 1996 19:35:38

Thanks for the reply Allan,

      Regarding your quick way for measuring strings: I've invested in the
Starett digital micrometer to get fast, accurate readings on my
string sizes (wound & unwound), and then plugged the results, along
with the speaking lengths into my humble MSWorks spreadsheet for
quick analysis. I've programmed in a combination Sanderson/Roberts
formulas for this (two inharmonicity calculations, I compare the
curves to check for simultaneous errors), and get a good reading of
the existing scale.
      My spreadsheet is weak on new scale calculation, I have to
experiment with wire sizes and speaking lengths to get what I
consider optimim results. So far, I've done 4 uprights and 1 4' 7"
Reed & Sons grand (why do all the small grands get rescaled?).
Results were fair to good, but I need something less time-consuming.

Thanks for your input,  8-) Rob
Rob Kiddell
C.A.P.T. Student
P.T.G. Associate
Edmonton, Canada
http://www.planet.eon.net/~atonal/atonal.html