Key ratio/knuckle relationship

[David Love]

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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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