Key ratio/knuckle relationship

[Farrell]

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Yeah, I think your question is a good one. Very often, because some =
things are difficult to change, and don't get changed unless there is a =
pressing reason - like KR - one will conclude that there is no =
difference between the two choices, but what one really means is that =
you can work with either one - but, one may be more preferable. My guess =
is that you are going to be better off with the ideal KR (of .50?) and =
adjusting the knuckle or other parameter as needed (pure guess though). =
I'd sure like to follow through how this shakes out though.

Terry Farrell =20
  ----- Original Message -----=20
  From: David Love=20
  To: pianotech@ptg.org=20
  Sent: Monday, July 09, 2001 11:24 PM
  Subject: Re: Key ratio/knuckle relationship


  Terry:

  This came up in a thread awhile ago in which Stanwood participated.  I =
had inquired about a problem with a Steinway action.  I was just =
becoming familiar with David's system.  Bill Ballard at one point =
commented at one point (to paraphrase), what's the difference if it's a =
.55 key ratio and a 17 mm knuckle or a .50 ratio and a 16 mm knuckle, =
none really.  In practice it seems that there is no difference.  The =
larger arc scribed by the capstan with a KR of .55 is compensated for by =
the smaller arc scribed by the 17mm knuckle and vice versa.  Well now, =
given the opportunity to make a choice by moving the balance rail, I'm =
wondering if there is a benefit to one over the other.

  David Love

    ----- Original Message -----=20
    From: Farrell=20
    To: pianotech@ptg.org=20
    Sent: July 09, 2001 7:41 PM
    Subject: Re: Key ratio/knuckle relationship


    Have you considered consulting with David Stanwood? Just a thought. =
I'm sure he would be an expert with this. Please let us know what you do =
and how it works out. Very interested in something like this. What an =
opportunity to improve/tweak the action.

    Terry Farrell
     =20
      ----- Original Message -----=20
      From: David Love=20
      To: Pianotech=20
      Sent: Monday, July 09, 2001 8:41 PM
      Subject: Key ratio/knuckle relationship


      Anybody still out there?

      I am having a set of new keys made for an 1899 S&S model A.  I =
have a choice of relocating the balance rail to set up the key ratio =
however I want.  Is there any benefit to having a lower key ratio and a =
shorter knuckle to center pin distance versus a higher key ratio and a =
longer knuckle to center pin distance?  Or is it six of one...?

      See you in Reno.

      David Love



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