Math/Physics Problem: degrees of rotation of tuning pin =howmuchpitch change

[John Ross]

Yes I saw the bit about a self tuning guitar.
There was some talk a while back about a self tuning piano, done with an electric current. 
I haven't heard about it for a while.
I wonder if it went by the wayside?
The company had something to do with QRS, I think.
John Ross
Windsor, Nova Scotia, Canada
jrpiano at win.eastlink.ca
  ----- Original Message ----- 
  From: Joe And Penny Goss 
  To: Pianotech List 
  Sent: Saturday, March 29, 2008 6:15 PM
  Subject: Re: Math/Physics Problem: degrees of rotation of tuning pin =howmuchpitch change


  Hi John,
  My attitude also, but not for the guy that is working on the self tuning piano.
  Did you know that there is now a self tuning guitar?
  Only 234 strings give or take 30 to go <g>
  Joe Goss RPT
  Mother Goose Tools
  imatunr at srvinet.com
  www.mothergoosetools.com
    ----- Original Message ----- 
    From: John Ross 
    To: Pianotech List 
    Sent: Saturday, March 29, 2008 1:09 PM
    Subject: Re: Math/Physics Problem: degrees of rotation of tuning pin = howmuchpitch change


    I would wonder, why, with all the variables, would you be interested?
    It can obviously be done, but to what end?
    John Ross
    Windsor, Nova Scotia, Canada
    jrpiano at win.eastlink.ca
      ----- Original Message ----- 
      From: kurt baxter 
      To: Pianotech List 
      Sent: Saturday, March 29, 2008 3:04 PM
      Subject: Math/Physics Problem: degrees of rotation of tuning pin = how muchpitch change


      Ok, I asked this on a previous thread, but I think the question got buried.
      How would one calculate the pitch change implied by a given degree of rotation of a tuning pin?

      The know factors would be: 

      string length 
      string thickness
      tuning pin diameter (and therefore radius) 

      With those factors known, is it possible to calculate the exact rotational movement (in fractions of a degree)
      required to make a pitch change of say, 1 hertz at the note middle C?

      (this is a impractical theoretical calculation- ignoring, for the moment, and factor of friction)

      Anyone out there better at math than me?


      [kurt]

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