[CAUT] stack fit to keyframe

[Ric Brekne]

At 1:49 pm -0700 9/9/06, David Ilvedson wrote:

Jd offers a very good reply here.  I might throw in that Bob Hohf wrote 
an excellent article series a couple three years back. Action Elevations 
I think it was called.

Its well worth reading.

Cheers
Ric B

 >When I come across a grand action stack that doesn't fit flush to
 >the keyframe, I have typically thought the keyframe should
 >beÊshimmed to fit...
 >
 >What I'm concerned about:   This action/keyframe is perfectly mated
 >to the keybed as it is...I'm wondering if I might not change
 >something not necessarily for the better...????

Any shimming or shaving you do is unlikely to change the mating of
the key-frame to the key-bottom.  The main question is whether the
line of the hammer-centres (and of the lever-centres) is straight and
parallel to the key-bottom, or the underside of the wrestplank, which
ought to amount to the same thing.  Then there is the question of the
height of the hammer-centre line, the differential boring of the
hammer-heads etc.  It is quite easy to get things wrong unless the
whole geometry of the action and the strings is taken into account
and the best makers are not guaranteed to get it right in the first
place once the drawing board fades into history.  I recently had to
make significant adjustments to a Hamburg Steinway of 1923 which can
never have been properly set up.

JD