The string is pulling side way to the pin or parallel to the bridge top. That's is the only force the pin can feel unless you filed the top of the bridge pin and set the string on top of it. Is that what you did? When the string is played it can ride up the pin or pull the pin out. Any downbearing is supported by the bridge itself but the pin stops the string from straightening out sideways on the bridge. Scissors or shears may not have been a good example as you tend to think both sides are moving. One side is all that has to move from our point of view though from it's point of view the force is equal and opposite and parallel. Keith R ----- Original Message ----- From: "Susan Kline" <sckline@attbi.com> To: <pianotech@ptg.org> Sent: Wednesday, July 31, 2002 11:53 AM Subject: Re: CA gluing Grand Pinblocks....My take on it/ Richard Brekne > At 11:15 AM 7/31/2002 -0700, you wrote: > >Richard, the shear force of scissors is two forces that are parallel but > >opposite and they shear the hair off which is at 90 degrees to the forces. > > Seems then, that with bridge pins, a shear force would be to pull the > pin out, or drive it further in. (?) > > Susan > >
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