hammer acceleration

[David Love]

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Roger:

The action is workable.  The key ratio is .53 for naturals and .55 for =
sharps.  The knuckles are 17mm and the dip is not excessive.  The caps =
are centered under the heels.  It's not grossly out, don't misunderstand =
me.  The action feels nice.  I just noticed that the acceleration rate =
was different and have noticed this variation periodically.  In this =
case once the static friction is broken the hammer begins to accelerate =
more quickly than many I have weighed off.  Anyway, on to the next one.  =
I'm tempted to try S&S parts on the next one I do, I'm glad to hear you =
were happy with the quality control.

David Love
  ----- Original Message -----=20
  From: jolly roger=20
  To: pianotech@ptg.org=20
  Sent: August 24, 2001 11:17 PM
  Subject: Re: hammer acceleration


  At 09:30 PM 8/24/01 -0700, you wrote:=20

    Roger:

    It is a Steinway from the 1980's and its a bit of a mess.  Sharps =
and naturals have different key ratios (oops). =20

  Hi David,
                This is starting to look like a misplaced capstan line.  =
How much dip is needed to give you correct let off and after touch?   =
How far off are you from the magic line at half blow distance?   Is the =
heel centred over the capstan?
  These questions will point you towards probable geometry problems.

  I have just finished installing the all new Steinway parts on a 69'  =
D, I'm delighted with the results.  Suprised the hell out of me.  But =
they have lived up to all the Reno hype.    51-47gm DW with mid twenties =
UP.    The new Knuckles look like kangaroo skin, definitely not buck =
skin, no large cup like the last S & S shanks that I used, and no where =
near as rough.  All flanges had very acceptable friction.

  Good luck in your quest.
  Roger

  All shanks and wippens less than 1gm variance.  Again a hugh =
improvement from the last set of parts that I used from them.


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