rear string lengths

[David Love]

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Re: rear string lengthsWe don't have the luxury of that much backscale =
length on the standard S&M, I mean S&S where zero bearing is the usual =
target.   I assume that is one of yours.  I am curious about the bearing =
in the treble section as it relates to backscale length.  Minimizing the =
bearing in the bass is something I am aware of for the reasons you =
mention.  But what about in the treble.  Would you consider modifying =
the bearing there depending on backscale length?  And back to the =
question posted earlier and addressed to some degree by Ron O., what is =
the ideal backscale length for each section?  How much must the =
backscale length deviate from the ideal length before you would consider =
modifying the bearing (if you would)?

And something else I've always wondered about, why, on many pianos, do =
hitch pins in the treble and tenor of many pianos not follow the curve =
of the bridge, but seem to go in a zig zag sort of pattern?=20



David Love
  ----- Original Message -----=20
  From: Delwin D Fandrich=20
  To: Pianotech=20
  Sent: December 05, 2002 4:38 PM
  Subject: Re: rear string lengths



    ----- Original Message -----=20
    From: David Love=20
    To: Pianotech=20
    Sent: December 05, 2002 4:24 PM
    Subject: Re: rear string lengths


    Should the backscale length be taken into consideration when setting =
down bearing?  Since a shorter backscale doesn't allow as much freedom =
of movement for the bridge, would you, then, consider reducing the =
bearing on a piano, or section, that had a shorter backscale, and vice =
versa?  Is there some formula or general rule of thumb for this.

    David Love

      Yes. Conventional wisdom tells us to set bearing very light in the =
bass. This is why. With the extremely short backscales commonly found in =
the low bass of modern pianos setting any kind of string deflection is =
going to tie the bridge/soundboard assembly down completely.=20



      With a backscale as shown above normal string bearing -- in this =
case about 0.5=BA string deflection -- is not only possible, but =
necessary.

      Del

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