Don - I don't think the resolution of the pictures is fine enough to be able to make a judgement, at least as they appear to me. Also, it's not clear which direction is front and which rear, however I'm guessing that the top picture is showing the sounding length. #1 has a definite disparity between pin contact and bridge edge. #2 is much better. It's hard to decipher side bearing or pin angle, so I guess, unlike Ron, I do see some possible causes of tonal problems. Regards, David Skolnik At 11:44 PM 4/29/2005 +0000, you wrote: >Hi Ron, > >Here are a couple of photos of the offending pin taken from 180 degrees >apart. Not sure they are small enough to come directly through. > >At 03:46 PM 4/29/2005 -0500, you wrote: > > >>Or just cutting the notch a bit farther back. There's no performance > > > > > > reason I > > > > > >>can see that the notch edge has to exactly bisect the pin. > > > > > > >> Is this just another old wives tale then? I was under the impression that > >> this would lead to a different vertical and horizontal termination--which > >> would cause the string to ring at 2 discreet frequencies at the same time. > >> I know of at least one 9 foot where this *is* the case in a low bass > string > >> that is poorly notched. Perhaps what I am hearing is nothing to do > with the > >> notch? > > > >That's what I was told too, from when I started back when, to the > >present day. The problem is, that just doesn't hold up to even > >casual inspection. Go look at new pianos in the exhibition hall at > >the convention this year. You'll see some that have notches cut back > >so far the bridge pin in entirely in the notch cut - but the strings > >aren't wild. That doesn't fit the explanation. Why? The notch looks > >exactly right, but the false beat is still there. That doesn't fit > >the explanation. Why? Now you find wild strings in the field, and > >stop the false beat temporarily by back bracing the pin with a > >screwdriver. The relationship between the notch and the pin didn't > >change, but the beat stopped. That doesn't fit the explanation. Why? > >Now you try to move a string up a bridge pin and discover how > >difficult it is to do that. To get the false beat by the old > >explanation, the string would have to slither up and down the string > >easily. It doesn't. That doesn't fit the explanation. Why? Seating a > >string sometimes clears up a false beat temporarily. Seating the > >string didn't change the relationship between the notch and the pin, > >so why did the beat stop? That doesn't fit the old explanation. Why? > >Now go back and read the 43,000 words written on the "why" in the > >last week or so (with plenty more of the same for some years back), > >and take another look at that early explanation of false beats. Then > >ask yourself ... why? > > > >I doubt if what you're hearing in that string has much of anything > >to do with the notch. Without seeing and hearing it, I'd be more > >inclined to suspect a longitudinal first. What have you tried in the > >way of diagnostics? > > > >Ron N > >_______________________________________________ > >pianotech list info: https://www.moypiano.com/resources/#archives > > > > > >-- > >No virus found in this incoming message. > >Checked by AVG Anti-Virus. > >Version: 7.0.308 / Virus Database: 266.11.0 - Release Date: 4/29/2005 > > > > > > > > >Regards, >Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T. >Non calor sed umor est qui nobis incommodat > >mailto:pianotuna@yahoo.com http://us.geocities.com/drpt1948/ > >3004 Grant Rd. REGINA, SK, S4S 5G7 >306-352-3620 or 1-888-29t-uner > >_______________________________________________ >pianotech list info: https://www.moypiano.com/resources/#archives
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