Hi Ron More items for the list. I think you mean Occams rasor. *smile*. How does one measure the tension in the tail length or the front segement? Are there formulas for these numbers? The point of this thread was originally to confirm the phenomina..that much has happened. If humidity control is *not* applied and these affects are consistant with a particular instrument, I wonder if deliberately trying to leave extra tension in the front lenght on the bass side and deliberately leaving lower tension on the treble side might ameliorate the smearing. Another point if the results are consistant, then some time can be saved because one knows what to expect of the unisons as a rule of thumb. >Modification: "changing" <> "important" <> "noticeably affecting pitch" > >Points regarding expected resulting pitch change. > >(1) soundboard *curl* >(1) bridge *roll* >(1) bridge *twist* (if there is any) >(3) rim and frame shape change causing plate distortion: >(1) plate angle >(3) plate position >(3) nose bolt rise - interesting notion - possibly (6) >(7496.25) soundboard rise >(9000) bridge length change low tenor >(3) bridge length change, everywhere else >(1000) bridge height change >(2) casters >(412) rumor and/or tuner error pin block rotation plate bushings changing size I don't think that when one is following one's own tuning it can be...a rumor LOL! >Now, back to the issue at hand. Have you sat down yet and worked out what >happens to the tensions in the different sections, taking into account >section lengths (elasticity), and friction at the bearing points? That and >soundboard rise and fall alone should account for the unison smearing >you're measuring without having to invoke tiny little smoke producing >demons at the far ranges of probability. Just a passing thought. > >Ron N > > Regards, Don Rose, B.Mus., A.M.U.S., A.MUS., R.M.T., R.P.T. Tuner for the Saskatchewan Centre of the Arts drose@dlcwest.com http://donrose.htmlplanet.com/ 3004 Grant Rd. REGINA, SK S4S 5G7 306-352-3620 or 1-888-29t-uner
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