[pianotech] Hammer Blow

[Paul Williams]

I've been also using the crescendo punchings for the past couple years and love working with them…waaaay more consistent results.

Paul


From: Dale Erwin <erwinspiano at aol.com<mailto:erwinspiano at aol.com>>
Reply-To: "pianotech at ptg.org<mailto:pianotech at ptg.org>" <pianotech at ptg.org<mailto:pianotech at ptg.org>>
Date: Tuesday, October 9, 2012 8:51 AM
To: "pianotech at ptg.org<mailto:pianotech at ptg.org>" <pianotech at ptg.org<mailto:pianotech at ptg.org>>
Subject: Re: [pianotech] Hammer Blow

Hi Floyd
 Dittos on Jons post.

  And just the squish factor of the avergae supply house front punching changes the feel and amount of overall dip/aftertouch based on touch pressure. They squish as much as .035 compared to .015 for Jurgens crescendo punchings. If you're looking for more precision in key dip/aftertouch its only logical use the latter to reduce errors from variables

Dale Erwin R.P.T.
Erwin's Piano Restoration Inc.
Mason & Hamlin/Steinway/U.S. pianos
www.Erwinspiano.com
Phone: 209-577-8397






-----Original Message-----
From: Jon Page <jonpage at comcast.net<mailto:jonpage at comcast.net>>
To: pianotech <pianotech at ptg.org<mailto:pianotech at ptg.org>>
Sent: Tue, Oct 9, 2012 4:29 am
Subject: Re: [pianotech] Hammer Blow


 >This week I'm going to see what happens to my hammer line if I set
hammer blow to achieve a specified amount of aftertouch.  I've set the
key height, >key dip and letoff.  I'll put the action in the piano, use a .045 punching with a notch cut out so I can slide it onto the front
rail pin over the cloth >punching with the key installed, and set the
hammer blow for each of the white keys such that a weight on the key (I
forget how many grams, and I'm >not in the shop to check) brings it
almost to let-off, and a slight downward tap on the key will take it
through let-off. Theoretically, the straightness of >the hammer line I
achieve with this procedure should allow me to evaluate how successful I
was in setting even key dip and consistent aftertouch.

Your hammer line will become erratic by doing this because of the
slightly different Key Ratios between notes. That procedure is what you
do to set an even touch with a priority given to aftertouch. But to do
this, you alter the dip not the blow distance. Keys level, hammer line
level, key dip slightly uneven. The pianist feels a even aftertouch and
not an uneven key dip. Altering the blow on an individual basis will
introduce volume discrepancies brought on by varying blow distances.

Aftertouch calibration by varying dip slightly is essential to a smooth
feeling action.

--
Regards,

Jon Page


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