hammer filing, blow distance, regulation

[Isaac OLEG SIMANOT]

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Hello Dave,

Filing and reshaping mean trying to have a good shape not too flat , where
the hammer meet the strings.

Beginners error (that can stay a long time), is to file an shape the thing a
lot an loose so much material that the sound is not more able to be
produced, no speaking of the  length of the parts.

Better learn to obtain an acceptable sound in the hammer grooves, or change
the hammers, that filing those hammers to the wood !

You know I am an old beginner (beginning to be an experienced concert tech
!) so I can tell that and I know why !

Regards !

Isaac OLEG
  -----Message d'origine-----
  De : owner-pianotech@ptg.org [mailto:owner-pianotech@ptg.org]De la part de
Dave Nereson
  Envoyé : lundi 18 février 2002 10:24
  À : pianotech@ptg.org
  Objet : hammer filing, blow distance, regulation



    ----- Original Message -----
    From: Billbrpt@AOL.COM
    To: pianotech@ptg.org
    Sent: Sunday, February 17, 2002 11:02 AM
    Subject: Re: Yes! We have no spoon benders!

     Please don't make the mistake of measuring the blow distance first the
way all the books tell you to and propping up the rest rail and go madly
cranking all of the capstans, etc.

    Bill Bremmer RPT
    Madison, Wisconsin
    Click here: -=w w w . b i l l b r e m m e r . c o m =-

        So if the grooves in the hammers of an old upright are a quarter
inch deep and you file and reshape (the customer can't afford new hammers
and steaming won't get rid of grooves that deep), then do you just put the
action back and leave the blow at 2 inches or more?   Doesn't that cause
bobbling hammers?  Doesn't it make the touch too slow because now the hammer
is going farther before it hits the string?  (The action parts still have
the same amount of travel if key height and dip haven't been altered yet,
but since all that felt is missing, the hammer "goes farther" before it
hits, plus it now lets off almost 1/2" from the string).  Why do the books
(and most vertical regulation classes I've attended) say to shim the rail up
so that blow is about 1 7/8", then regulate a few keys and see how the
repetition and checking turn out, then re-consider blow, etc.?
        Same with grands -- if you don't replace hammers, but rather file &
reshape, then you end up having to at least re-regulate let-off, drop, and
backchecking.   If you also turn the capstans up, then you gotta re-regulate
jack-to-knuckle position. . . .
        I guess what I'm asking is:  If you don't shim the upright hammer
rail or turn grand capstans up to get a blow distance of about 1 7/8", plus
or minus an eighth or so,  then what DO you do -- leave the blow wide?
refuse to regulate unless they agree to new hammers?        --David Nereson,
RPT, Denver

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