[CAUT] Wire Stretch

[RicB]

Hi Jurgen.

I see that half of what I said below is in error.  Indeed... if the 
string deflection angle is the same, and there is similar tension on the 
wire then downbearing force appears to be pretty much the same.  
However, in order to acheive the same string deflection angle for a 
longer string the actual amount of deflection has to be more. Height of 
a larger triangle with similar angles to a smaller triangle.  Looks 
quite a bit more doable then I had at first thought... but then on the 
other hand, seems like almost every time I hear talk about scales, 
string deflection angles are lower in the lower part of the scale... and 
I'd kinda thought this had to do with the fact that the ribs are longer 
and cant hold as much load. 

I look forward to reading this thread onwards.  I still dont see how any 
of this can account for an increase in tuning stability... unless as I 
first querried, the downbearing was made to be uniform across the entire 
bridge... which I dont think really anyone does... but of course could 
easily be wrong about.

Cheers
RicB



    I am unclear on this.  If the  string tension and the deflection angle
    are the same, why the length of the end I am pulling on matter?  Why
    would that change the amount of downbearing force?


    Jurgen Goering

    On Apr 28, 2007, at 6:29, Ric wrote:
     > snip... I have noticed that getting the same amount of downbearing
     > force on a long string vs a short string requires quite a bit more
     > string deflection and hence deflection angles. Most of what I read
     > here is that usual practice is to have very little downbearing
    angles
     > in the lower areas of the scale, and more in the treble. Which
    goes in
     > the opposite direction of evening out downbearing force.
     >
    snip
     > Cheers
     > RicB