Mechanical Music Digest  Archives
You Are Not Logged In Login/Get New Account
Please Log In. Accounts are free!
Logged In users are granted additional features including a more current version of the Archives and a simplified process for submitting articles.
Home Archives Calendar Gallery Store Links Info
MMD > Archives > January 2003 > 2003.01.20 > 10Prev  Next

Regulating the Piano Action
By Roger Waring

I believe that the correct hammer to string strike distance may vary
slightly between uprights, but 47 mm is probably adequate for most old

If at rest, the hammers sit proud of the rest rail, then the key
capstans need adjusting.  I lower them until there is just the tiniest
amount of lost motion.  The tests that I use are these:

 - I very gently lift the hammer rest rail using the elbow that
connects to the soft pedal lifter rod.  A couple of millimetres is
all that is needed.  The hammer should move instantly. If it does not,
the capstan is too high.

 - I then press very, very lightly upon the key so that the whippen lifts
the merest discernible fraction, but the hammer does not move.  If the
hammer does move upon initial contact with the key then the capstan is
too high.  If I have to press down more than a light touch then the
capstan is too low.

As for the noises, this must surely be related to missing or worn notch
felt, or perhaps very hard leather on the hammer butt.  Of course, the
jack tips should also be re-leaded [treated with graphite or other
suitable lubricant].

But the best advice is to be found in Art Reblitz' book, "Piano Servicing
Tuning and Rebuilding."  Chapter Five gives a most comprehensive

Roger Waring - The Pianola Workshop
Solihull, United Kingdom

(Message sent Mon 20 Jan 2003, 11:10:55 GMT, from time zone GMT.)

Key Words in Subject:  Action, Piano, Regulating

Home    Archives    Calendar    Gallery    Store    Links    Info   

Enter text below to search the MMD Website with Google

CONTACT FORM: Click HERE to write to the editor, or to post a message about Mechanical Musical Instruments to the MMD

Unless otherwise noted, all opinions are those of the individual authors and may not represent those of the editors. Compilation copyright 1995-2019 by Jody Kravitz.

Please read our Republication Policy before copying information from or creating links to this web site.

Click HERE to contact the webmaster regarding problems with the website.

Please support publication of the MMD by donating online

Pay via PayPal

No PayPal account required

Translate This Page

. .