string seating - was bridge caps

[Richard Brekne]

Much easier to read...a couple questions if you will forgive my
ignorance....:)  You have pin angles as high as 28 ...degrees ? And
the resistance down / up numbers... those are units of what ?... psi
or ??

The friction co-efficient is Mikes I guess...and I suppose we will
have to except that as beef.. Could you put all this  into a formula
form to show exactly what pressure is put onto the bridge at the
edges on the bridge ?  Sounds a bit difficult to do for the rest of
the bridge as  the farther away from the bridge pins the less affect
from them... in an exponential fashion I suppose..

I also note that there is some resistance to the strings moving down
the pins... grin.. and I suppose you already know where I would want
to take that....Obviously if the bridge swelling can push the
strings up the pins, while at the same time not causing a severe
enough  indentation, while at the same time the resistance from the
pins to the strings moving back down as the bridge reverts  is high
enough to prevent them from doing so without a nudge... then we have
a hole in the argumentation :)

Ron Nossaman wrote:

> Well, that was miserable. Let's try it with tabs.
>
> St=String Tension
> Sa=Stagger Angle
> Fc=Friction Coefficient
> Pa=Pin Angle
> Rd=Resistance Down
> Ru=Resistance Up
>
> St      Sa      Fc      Pa      Rd      Ru
> 160     10      0.52    28      -0.042  26.045
> 160     10      0.52    25      1.6038  25.087
> 160     10      0.52    20      4.3347  23.339
> 160     10      0.52    15      7.0326  21.414
> 160     10      0.52    10      9.6770  19.326
> 160     10      0.52    5       12.247  17.090
> 160     10      0.52    0       14.725  14.725
>
> Ron N

--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no