tapping strings

[Richard Brekne]

Ron Nossaman wrote:

>  >Secondly when a piano is restrung common practice nowadays to to get rid of
> the
> >indentations, and refresh the notching.  I've often wondered what this is
> >doing to
> >downbearing.
>
> Why wonder? Break out the Trig and figure it out. The difference will be
> most dramatic in the shortest strings. What is the angle change of a 50mm
> string when one end is lowered by 0.015" (0.38mm)?

Assuming a 1 degree angle from the bridge to the front termination point you
are nearly cutting the angle in half.  A 50 mm string set at a 1 degree angle
gives a height of 0.87 mm.  Lowering it by 0.38 mm is quite a bit actually....
considering that wire guage 13 (typical for this area og the scale) is only
0.031 inches or roughly 0.78 mm You've got that string buried so deep into the
bridge you probably would have trouble digging it out.  I dunno about you but I
cant remember the last time I saw a string groove that is equivalant to half
the diameter of a string. :)

> .
>
> Ron N




--
Richard Brekne
RPT, N.P.T.F.
Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html