hammer filing, blow distance, regulation

[Dave Nereson]

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  ----- Original Message -----=20
  From: Billbrpt@AOL.COM=20
  To: pianotech@ptg.org=20
  Sent: Sunday, February 17, 2002 11:02 AM
  Subject: Re: Yes! We have no spoon benders!
  =20
   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.=20

  Bill Bremmer RPT=20
  Madison, Wisconsin=20
  Click here: -=3Dw w w . b i l l b r e m m e r . c o m =3D-=20

      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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