grand hammer hanging question

[Richard Brekne]

That seems like a little short distance between flange center and hammer
moulding center. 124-127 cm... are you sure thats spec ? Ask Don
Mannino... he'll no doubt know.

An action not able to regulate because you cant screw up the let off
button enough would point me first in the direction of a bore length
problem. Are you sure the hammers you are replacing are origional ?
Perhaps they were so worn down and/or reshaped that they simply werent
long enough ?

As for the straight line bit... no real rule says you have to have them
in a straight line... looks nice tho :)... but actually, if want the
most out of the sound, then the priority should be the strike point for
each string. Unless you are routined at finding that tho, might be
easiest to keep on the straight and narrow as it were. If you do vary
the line, you can also fudge a bit on the rake if you need to.... tho I
wouldnt get carried away with that.

RicB



Jon Ralinovsky wrote:
> 
> Hello,
> I'm rebuilding the action for a 1968 Kawai Model 600 (6' long).  The
> hammers are hung in a straight line, but the distance from the hammer
> flange center pin to the center of the hammer molding tapers from 4
> 7/8" in the treble to 5" in the bass.  The top hammers sounded decent
> before I took the action out of the piano; unfortunately, I didn't
> check the case parts to see if I could move the action in or out.  Is
> there any reason that I shouldn't duplicate the original specs?  Is
> it important that all the hammers are hung at the same distance from
> the hammer flange center pin?  If it makes any difference, I did
> change the bore distance of the hammers from 2 3/16" to 2 3/8" in the
> bass and from 1 7/8" to about 2 1/8" in the treble; this was done due
> to the hammers overcentering and the action not being able to be
> regulated.  I look forward to your responses.
> 
> Respectfully,
> Jon
> 
> --
> Jon Ralinovsky
> Piano Technician
> Department of Music
> Miami University
> 513/529-6548
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives

-- 
Richard Brekne
RPT, N.P.T.F.
UiB, Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html
http://www.hf.uib.no/grieg/personer/cv_RB.html