How to explain a pitch adjustment

[John Delmore]

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It is an interesting question.  The difference in tension needed to cause a
one cent difference in pitch is going to vary according to the mass (and
possibly the stiffness) of the string (I'll have to check my old physics
books tonight).  So, to get a general value for added tension per cent PR,
you'd have to consider, also, the size of the piano, i.e. you'd have
different values for a spinet, a large upright and a large grand.  
John (finally a bona fide member) Delmore
 
  _____  

From: pianotech-bounces@ptg.org [mailto:pianotech-bounces@ptg.org] On Behalf
Of jonathan stuchell
Sent: Tuesday, December 20, 2005 9:37 PM
To: Pianotech
Subject: Re: How to explain a pitch adjustment
 
  Thats good, I want to know the   tension per cent . That is a good
constant, useful for many applications.  
----- Original Message ----- 
From: Geoff Sykes <mailto:thetuner@ivories52.com>  
To: 'Pianotech' <mailto:pianotech@ptg.org>  
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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