Scaling progranms-Calculating Technician

[Joe And Penny Goss]

Hi Jude,
I do not have that one but do have
"Piano Rebuilders' Handbook Of Treble String Tensions 
( And Other Characteristics)"
by James H Donelson R.T.T.
4 pages of words 6 of drawings and 900 pages of numbers
Joe Goss RPT
Mother Goose Tools
imatunr at srvinet.com
www.mothergoosetools.com
  ----- Original Message ----- 
  From: Absolute Piano 
  To: Pianotech List 
  Sent: Wednesday, September 27, 2006 8:47 AM
  Subject: Scaling progranms-Calculating Technician


  The Calculating Technician is out of print. Does anyone have a copy that I could beg, borrow or steal? On this topic, I've heard that the calculations (or the approach) are not quite right. I wouldn't know but would be interested in hearing any comments? Besides you gotta start somewhere.

  Jude Reveley, RPT
  Absolute Piano Restoration, LLC
  Boston, Massachusetts
    ----- Original Message ----- 
    From: Jason Kanter 
    To: Pianotech List 
    Sent: Tuesday, September 26, 2006 5:49 PM
    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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