[pianotech] Flagpoling

[lim hock seng]

Thank you David and Terry.

Best regards,
Lim
On Aug 10, 2012 6:14 PM, "David Boyce" <David at piano.plus.com> wrote:

>  Lim, "flagpoling" is a term used to describe the effects of flexibility
> in a tuning pin.
>
> A flagpole (can also be written as two words, flag pole) is of course the
> long stick on which a flag flies at the top. It might seem thick and rigid,
> where it enters the ground.  But at the top, away up in the air, there can
> be considerable movement, as the wind whips the flag around.  High
> buildings are the same, and are indeed designed to move several centimters
> in high wind.
>
> Piano tuning pins are short, and SEEM absolutely rigid.  But in fact they
> can to some extent both twist internally, and bend.  These effects have to
> be borne in mind when tuning.  The string may move sufficiently to be in
> tune, but only because the pin has bent or twisted without moving in its
> pinblock hole.  If that is the case, the string is likely to go out of tune
> quickly.
>
> Tuning involves an awareness of, and a feel for, these "flagpoling"
> effects.
>
> Best regards,
>
> David.
> www.davidboyce.co.uk
>
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