OOOOPSSSSS Re: what is downbearing

JIMRPT@aol.com JIMRPT@aol.com
Fri, 27 Feb 2004 09:59:26 EST


In a message dated 27/02/04 7:59:55 AM, RNossaman@cox.net writes:

Ron since my 'thought processes have been validated by "Rogjim Jolynt" I am 
worried about them! :-)
But...............

<< But those unisons are all supposed to produce different fundamental 
pitches, which tends to level the tension differences somewhat, and is 
presumably part of the process by which the wire sizes were chosen in the 
first place.>>>
hmm 'presumptions and assumptions'.........nah probably not, the stringer 
probably just took a coffee break and when he came back forgot how many # 17s he 
had already put on. :-) 

<<The per-string  tension difference from the first of those 
#17s to the last is just under 20 pounds (about 57 pounds for the unison) 
in the example I have here, with the unison down bearing force being under 
a pound difference.>>

Well Ok...but that doesn't change my thoughts or comment.
Let's assume a tension of 180lbs on the highest note strung with #17..K?
With that assumption the tension on the lowest string, using your figures, 
would be either 200lbs or 160lbs or  9% and 12.5% differences 
respectively.......as to the downbearing force ....let's assume a downbearing force of 10lbs on 
the highest note
 (it ain't that high but let's assume so)
at the 200lb figure the down bearing would be 10% higher, or with the 160lb 
figure, 10% lower..........at a lower downbearing pressure the % differences 
would be much greater...........
 In my book the 9%, 12.5% and 10% differences are "vast" when we are dealing 
with such low numbers to begin with.

In any event my comment was meant to be illustrative in general more than 
specifically. The point having been that differences in tension and downbearing 
are not needfully detremental to tonal production...at least I think that is 
what I was trying to illustrate. :-)

<<Just a pinch of perspective.>>

 My perspective........... but I don't have all the answers either.
Jim Bryant (FL)


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