Accu hitch pins

[Delwin D Fandrich]

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  ----- Original Message -----=20
  From: Wimblees@aol.com=20
  To: caut@ptg.org=20
  Sent: August 09, 2002 11:04 AM
  Subject: Re: Accu hitch pins


  In a message dated 8/9/02 9:32:17 AM Central Daylight Time, =
atodd@UH.EDU writes:=20



    Wim,=20


    Wouldn't one need "several" thicknesses of wood to do this?=20
    It's going to vary across the scale, isn't it?=20


    Avery=20





  According to what Kent told me, there is no difference, as long as =
there is enough bearing. If more bearing is needed, all you need to do =
is tap the string down on the pin.  =20

  Wim=20

I would guess that Kent either misunderstood your question or you =
misunderstood his answer. It would be rare for the string elevation =
above the plate to be uniform across the scale. This setting is going to =
vary depending on the physical idiosyncrasies of the specific soundboard =
assembly and the specific plate casting. And with the phase of the moon =
and on how close it is to the Winter or Summer Solstice.

If the intent is to duplicate the original bearing settings then simply =
measure and record the elevation of the end strings of each section and, =
perhaps, one or two toward the middle before destringing. String the =
piano and set the new strings back where the originals were.=20

In all probability, however, new bearing settings will be desired to =
accommodate a slightly settled soundboard. Usually this means that the =
strings will end up a bit lower on the pin than they were originally. =
Assuming the factory got it right originally.

Probably the easiest way to do this is to start by setting them where =
they were originally and measure string deflection using a bubble gage.
 =20
You can use the settings in the directions sent by Avery or follow the =
general rule of 1.5% of string tension bearing against the bridge in the =
treble section, easing off to 1.0% in the tenor and 0.5% in the bass. =
Since bubble gages vary in how they read you'll have to find out what =
each gradation means on the gage you're using. The Baldwin-designed gage =
is set up so that each gradation indicates 17 minutes of arc. Or, =
translated, 0.5% of string tension bearing against the bridge.

Del


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