Bridge pin angle

[David Skolnik]

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
> >_______________________________________________
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> >
> >
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>
>
>
>Regards,
>Don Rose, B.Mus., A.M.U.S., A.MUS., R.P.T.
>Non calor sed umor est qui nobis incommodat
>
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