scaling problem

[ed miller]

Thanks David.

Here's the situation. At the time I destrung the piano I did not have a 
trustworthy mircometer, so I took out each unison, taped them together and 
labeled the note number. Then I took out the plate to make soundboard and 
bridge repairs, so I can't measure string lengths at this time.

I 'miked' the unsions yesterday with my new micrometer, and that's when I 
found the problem.

Maybe I'll take the speaking length measurements when the plate is back in 
and have it rescaled......any other options? Is it possible I can find a 
scaling that has already been done for this piano? It is a 1908 52" Knabe 
Upright

Ed

>From: "David Love" <davidlovepianos at comcast.net>
>Reply-To: Pianotech List <pianotech at ptg.org>
>To: "'Pianotech List'" <pianotech at ptg.org>
>Subject: RE: scaling problem
>Date: Mon, 17 Apr 2006 20:27:40 -0700
>
>If it's already destrung and you can't take measurements, how do you know
>that there are two different size strings on one unison?  All strings in a
>unison need to be the same size.  I'm not sure exactly what the situation 
>is
>but you should make the correction in one direction or the other.  Try and
>determine if the pervious stringer just put on the wrong size by examining
>the number of hitches per string grouping in that area.  You can also add a
>hitch pin for a single string if necessary.
>
>Should you decide to rescale, it's not a bad idea, there are several people
>around who do it and it's not prohibitive.  All you need to do is measure
>the speaking lengths and give the wire sizes you have for the plain wire
>strings.  The method for measuring wrapped string lengths is usually to 
>take
>a measurement from the hitch pin to the bridge pin on the speaking side and
>then the hitch pin to the agraffe or termination on the tuning pin side.
>The speaking length can then be calculated by the difference and any good
>scaler can calculate a wrapped string chart and scale from that data.  If 
>it
>is truly a learning experience piano, you will gain some knowledge by 
>having
>someone do the rescaling for you and you will also be able to solve the
>current dilemma in an appropriate manner.
>
>David Love
>davidlovepianos at comcast.net
>
>-----Original Message-----
>From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On 
>Behalf
>Of ed miller
>Sent: Monday, April 17, 2006 7:35 PM
>To: pianotech at ptg.org
>Subject: scaling problem
>
>I am restringing an entire piano for the first time.
>
>I have encountered a unison with 2 different sized wires in it (sizes 15.5
>and 16). I am sure that this is the case (ie, this is not due to an
>incorrect mesaurement).
>
>My question is....what are my options for restringing?
>
>The piano I am working on is my own project for learning purposes. I am
>trying to spend as little money as possible (so I do not want to pay for it
>to be rescaled... besides, isn't it too late since I can't take approriate
>measurements with it already de-strung?).
>
>Should I restring it the way it was? Should I add some single strings to
>make all unsions contain the same wire size within themslves? What
>else.....?
>
>Thanks in advance.
>Ed
>
>
>
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