A not so boring, boring dilemma

[Newton Hunt]

One effect of changing a bore distance is the differences in
regulation.  Shortening the bore will raise the let-off, the drop and
change the capstan location.  I should suggest boring several hammers of
different sizes at the angles you suggest and try the regulation and see
how it feels.

Feel is the ultimate criteria.

		Newton


> David Love wrote:
> 
> I'm rehammering an old Bechstein (c.1900).  The old hammers are hung
> at between 93-95 degrees to compensate for short boring due to a
> greater than average distance from the hammer flange centers to
> the strings.  For example, in the center of the piano, the string
> height would necessitate a
> 2-1/4" bore.  In fact, in the treble and tenor sections alone the bore
> distance varies by 1/4".  Because the hammers that I would like to use
> (primary tonal selection, secondary weight selection), even with extra
> long moldings, will not accommodate that bore distance and still leave
> a 1" tail length, I am considering not quite duplicating the obtuse
> angles present in the existing action to get the hammers at 90 degrees
> to the strings, but rather uniformly short boring everything so that
> the obtuse angle will be consistent from section to section and the
> shanks' rise above parallel to the strings will also be uniform.   Is
> there any compelling reason to avoid this arrangement?  What is the
> maximum angle or maximum rise of the shank beyond parallel that you
> would consider before problems might arise?  And what sort of problems
> might those be?
> 
> David Love