Today's Annoyance Kluge keys

[Greg Newell]

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Dean,
         If this is true why does the veneer glued on the sides of a broken=
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key affect such a lasting repair?

Greg Newell

At 11:37 AM 6/3/2004, you wrote:
> >>I am toying with trying to put a very thin coat of epoxy on either side=
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> of the key about two inches on either side of the button.  This may give=
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> me the stiffness they need.
>
>
> From a structural standpoint all of your stiffness comes from the upper=20
> and lower fibers of the key. Think of the key as an I-beam. The load of=20
> the I-beam is carried by the upper and lower flanges. The web in the=20
> middle carries next to nothing, it only connects the flanges.
>
>So adding stiffness to the sides will not accomplish much. It needs to be=
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>added primarily to the portion under tension, that would be the top of the=
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>key. Most of your deflection will come from the wood under tension, not=20
>the part under compression. And the weakest part of the key is the balance=
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>rail hole. So the greatest payback is to add your stiffness to the button=
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>and the connection of the button to the key.
>
>Super glue would penetrate the wood and the glue joint of the button. Keep=
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>it away from the bushing cloth, obviously.
>
>Dean
>
>Dean May             cell 812.239.3359
>PianoRebuilders.com   812.235.5272
>Terre Haute IN  47802
>
>

Greg Newell
Greg's piano Fort=E9
mailto:gnewell@ameritech.net=20
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