resetting hammer blow line in grands

[Farrell]

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Many small grands work with a blow distance of 1-3/4" while most medium =
and larger grands work best with something closer to 1-7/8". The key =
here is "works best". You need to experiment and see what kind of key =
dip works with what kind of blow distance - every action is going to =
have some variation in geometry which will affect this relationship. But =
start with the aforementioned and see what kind of dip you end up with - =
do a couple test keys first to evaluate. If you like the dip, stick with =
it. If not change it a bit.

You need to get "The Piano Action Handbook"  http://www.pianotuning.com/ =
 (click on Potter Press Books).  It has original factory specs for most =
pianos you will every run across (yes, even for some pianos that you =
should run across - as in with a paving machine). Factory specs are a =
good place to start - always test a few notes first to see how things =
work out.

If your keys have lost motion, that means your hammer shanks are resting =
on the shank cushion rail (or you've got about 76 grams of friction in =
your wippen flange!). They should be up off the rail - in that position, =
you will not have any lost motion and key heights will be true (not =
necessarily level, but each key will consistently rest at a particular =
height - until, of course, you level them).

Punchings under the key at the center rail pin address key level and =
capstan adjustments address blow distance. Two very different things =
that affect one another. Read Roger Jolly's Journal articles on =
"Interactive Regulation".

Have fun with your adventure! One word of advice I can lend you is to do =
your first (and second and third and.....) action regulation in your own =
home or shop - not in the customer's home. I am still on a steep =
learning curve when I comes to action regulation. I get so much benefit =
from taking my time in the privacy of my shop experimenting with "what =
happens when I do this or that". IMHO, a unhurried private environment =
is paramount to successful early action regulations!

Terry Farrell


  ----- Original Message -----=20
  From: Alpha88x@aol.com=20
  To: pianotech@ptg.org=20
  Sent: Friday, January 30, 2004 6:47 AM
  Subject: resetting hammer blow line in grands


  greetings,

               I am doing my first grand regulation and have a question. =
If the whippen and key capstan have "lost motion" thereby making the key =
levels have all different heights, then does turning the capstan take =
care of the key levels as well as adjust the hammer blow distance? In =
other words are they one and the same adjustment?

                Without having a spec manual, is there a general rule of =
thumb for obtaining the correct hammer blow distance on grands? The =
piano is a Hazelton Brothers 6' grand.


  rookie,
  Julia Gottchall,
  Reading PA

                
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