Bridge Pins & Nega Bearing

[william ballard]

Hi Ron,

On Apr 23, 2006, at 7:15 PM, Ron Nossaman wrote:
>> 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.

Then some tremendous force must be at work, because strings which  
have crept upwards against slanted pins and side-bearing are a  
regular part of our day. And that's outside such at-risk conditions  
as a rolled bridge with negative bearing at the front and positive at  
the back.

But the strings wouldn't have to be pulled up off a bridge for  
negative bearing to damage the pinning. An earlier comment of mine  
about "having to toss out bridge pins as a coupling mechanism" in the  
negative bearing scenario didn't seem to raise any comments.

Mr Bill


"Talking about music is like dancing about architecture"
     ...........Steve Martin
+++++++++++++++++++++