At 13:04 -0500 29/3/08, kurt baxter wrote: >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? Well, if the pin is 7.00 mm. and the string is 1 mm in diameter, you will stretch the string 1 mm for every 14.32 degrees rotation of the pin. You then need to know the modulus of elasticity of the wire, since softer wires will stretch more for a given increase in tension. You would then use the usual formulas to work out the change in pitch for a given extension. On another day and in a different mood I might be inclined to work out the full answer, but it's been a long day. JD
This PTG archive page provided courtesy of Moy Piano Service, LLC