hammer acceleration

[David Love]

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Friction was pretty uniform ranging from 15-12 g from bottom to top.  =
slightly high due to heavy Steinway hammers probably.  I do check the =
knuckle heights since you mentioned that on a post some time ago.  They =
were very consistent on this set.  The acceleration characteristic was =
there after I re-weighed the piano for uniform balance weight.

David Love
  ----- Original Message -----=20
  From: Jon Page=20
  To: pianotech@ptg.org=20
  Sent: August 26, 2001 5:00 AM
  Subject: Re: hammer acceleration


  At 06:04 PM 08/25/2001 -0700, you wrote:

    Roger:
    =20
    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.
    =20
    David Love

  Could it be that the ones which accelerate faster also have a lower =
friction or Balance Weight?
  Check knuckle height, there may be a noticeable difference from note =
to note;
  another process prior to shank installation is measuring knuckle =
height and
  grouping similar ones together.

  Regards,
  Jon Page,   piano technician
  Harwich Port, Cape Cod, Mass.
  mailto:jon.page@verizon.net
  http://www.stanwoodpiano.com
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~=20

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