On Tue, Feb 1, 2011 at 8:31 PM, David Love <davidlovepianos at comcast.net>wrote: Consider that the main issue in stability is tension equilibrium in the > various string segments (more than leaving excess flex in the pin). > Could be. I've never measured for any equilibrium. I just think in terms of leaving the string and pin so neither moves. > Over shooting means that you have necessarily increased the tension in the > first segment (nearest the tuning pin) more than the other segments and > stability is only achieved when you have released the excess tension from > that segment back to the remaining segments and they land where you want > them. Not only does that increase the possibility that with any rendering > issues the first segment will be slow to give up its excess tension but it > gives you an automatic correction that must be made. If you could simply > increase the tension in the first segment only the requisite amount > necessary to bring the speaking length up to pitch, then you only need to > wait for the pitch to rise to where you want it and stop, not rise past > where you want it settling it back down to where you hope it will stop and > stay. > Read my reply to Ron N's email. > It is interesting to note that in the RPT exam re stability, according to > my local CTE, 95% of the loss of stability is to the flat side. That > suggests that the tendency to leave excess tension in that first segment is > the prevailing one when things go wrong. It would be better not to get it > there in the first place. > Could be. I don't know. My unisons were 100%. But, heck, it's a pretty generous tolerance, so that's not necessarily braggin' or nuthin'. <G> I'd be embarrassed if my unisons were merely good enough to pass the RPT unison section! > Overshooting also, in my opinion, increases the likelihood of string > breakage, especially on pianos that render poorly. > How so? From the higher pitch? -- JF -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://ptg.org/pipermail/pianotech.php/attachments/20110201/eb162af1/attachment.htm>
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