Bridge Pins & Nega Bearing, was Re: Why do we need crown?

[Ric Brekne]

I beg to differ.  It is not uncommon at all to find unseated strings in 
uprights and grands and the reasons for this situation tho subject to a 
lot of speculation and casual number pushing is hardly charted clearly.  
It goes without saying that there is a stronger tendancy for strings to 
pull away from a negative crown / negative bearing situation then 
positive/positive due to the very nature of the upwards forces involved. 
The impact of the initial pulse on the bridge, string leverage moments 
on and around the bridge, climatic factors and a probably a good deal of 
other factors are all part of the picture. That strings unseat from the 
bridge is a simple fact that is observable.  Conditions that this can 
occur under are drafted in the article I wrote for last Junes Journal. 
Anyone who wishes can objectively confirm that all these can and do 
occur by open minded experimentation.

Cheers
RicB

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 > Positive bearing strings will stay seated just as well with positive
 > crown as with negative crown. It's negative bearing strings which won't
 > stay seated and which apply their force to destroy the pinning. That's
 > regardless of positive or negative crown.


It would take a tremendous negative bearing to pull a string
up off of a bridge against the slanted pins and offset angle,
unless pin slant was only very slight. Otherwise, strings
don't un-seat from bridges.

Ron N