string breakage

Stephen Birkett sbirkett@real.uwaterloo.ca
Thu, 24 Jun 2004 15:23:24 -0400


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Wim asked:
>I have a string that keeps breaking when pulled up to pitch. Should 
>I use a thicker string or a thinner string?

Thinner is stronger than thicker, but the improvement is minimal for 
high carbon steel music wire. There's a discussion about this between 
me and Newton somewhere in the depths of the pianotech archives.

>Should I try a thicker string that will withhold the tension, or a 
>thinner string for a higher pitch?

Both strings will have the same stress for the same scale position, 
but the thinner string is stronger so more able to withstand that 
same stress level.

I'd check for other factors that are causing the breakage.

By the way, what is the pitch, speaking length, and wire gage of the 
offending string?

Stephen
-- 
Dr Stephen Birkett
Associate Professor
Department of Systems Design Engineering
University of Waterloo
Waterloo, Ontario
Canada N2L 3G1

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mailto: sbirkett[at]real.uwaterloo.ca
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