How to explain a pitch adjustment

[jonathan stuchell]

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Message  Thats good, I want to know the   tension per cent . That is a =
good constant, useful for many applications. =20
  ----- Original Message -----=20
  From: Geoff Sykes=20
  To: 'Pianotech'=20
  Sent: Tuesday, December 20, 2005 5:44 PM
  Subject: RE: How to explain a pitch adjustment


  That raises an interesting diversionary question. What's the amount of =
tension per cent? How many cents of change, over the entire piano, would =
create a ton of tension change?

  -- Geoff
    -----Original Message-----
    From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] =
On Behalf Of Cy Shuster
    Sent: Tuesday, December 20, 2005 2:24 PM
    To: Pianotech
    Subject: Re: How to explain a pitch adjustment


    I measure pitch on all the A's before I start, and record this for =
the customer on a graph on the invoice.  This gives them a great visual =
about what work is needed.  The graph indicates "fine tuning" range (+/1 =
eight cents for me).

    The analogy I use is sanding: if wood is very rough, you can't start =
with the 1000-grit paper; multiple passes are required.  Same thing for =
painting: with regular maintenance, one coat covers, otherwise you may =
need several.

    A description of the forces involved helps: 15 to 20 tons of tension =
overall; a pitch raise can add a ton of tension (right?), yet a fine =
tuning requires < 1% accuracy.  No wonder it doesn't last!

    --Cy--


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