>>...does the plate > >continue to flex after a major pitch raise ? > > > >Sid Blum > > As far as I know, it doesn't enough to be a factor. The vast majority of > plate deformation happens while you're changing the loading during a pitch > adjustment. The long term changes will have more to do with string > rendering and segment tension equalization and wood creep. Again - as near > as I can tell. If the plate kept flexing and compressing after you were > done messing up it's loading balance with the tuning process, a piano with > as light a plate as an S&S D wouldn't be tunable at all, and that doesn't > seem to be the case. Besides, if the plate kept deforming under tension > enough to mess up a tuning some time after it was finished, wouldn't they > all eventually pull themselves into a little ball? A plate adjusts to the > tension changes as they happen - or breaks. > > I hear comments like "It's still drifting", after a tech has made a first > pass and the piano is still 10 cents low. No, it's not still drifting, he > just didn't overshoot the pitch enough. > > > Ron N After raising pitch 50-100 cents,and leaving the piano at 440 I usually expect the piano to drop and need another tuning within a few weeks. Does this suggest that I am missing something? Sid Blum sid@sover.net
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