Steingraeber factory pictures, bridge agraffes & adjustable vertical hitchpins

[Calin Tantareanu]

I have a feeling that everybody is making things much more complicated than
they really are, about the way bridge agraffes work.
I have no scientific measurements or formulas to back my own simple
explanation, just a few experiments and the fact that bridge agraffes
performed pretty much the same way I had imagined before I had a chance to
hear one for real.

Calin Tantareanu
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> -----Original Message-----
> From: pianotech-bounces at ptg.org 
> [mailto:pianotech-bounces at ptg.org] On Behalf Of Ron Nossaman
> Sent: miercuri, 3 mai 2006 23:43
> To: Pianotech List
> Subject: Re: Steingraeber factory pictures,bridge agraffes & 
> adjustable vertical hitchpins
> 
> 
> > It doesn't, but the use of these bridge agraffes appears to 
> open the 
> > possibility of zero downbearing while maintaining good reliable 
> > termination.  With zero downbearing, it seems that the soundboard 
> > designer is suddenly given more choices and freedom of 
> design (one of 
> > the choices available being...  include downbearing!).
> > Steve Fujan
> 
> We've been over this many times. The slanted pins and offset 
> angle of conventional bridge pinning provides a good solid 
> clamp termination at the bridge without the need for 
> downbearing. Downbearing isn't for bridge coupling, it's for 
> an opposing spring system to the strings, and increasing the 
> stiffness of most of the soundboard assemblies out there by 
> rib loading and/or panel compression. Soundboard designers 
> always have, and still do have the option of designing zero 
> bearing soundboards with absolutely no detectable penalty in 
> string to bridge coupling with conventional pinning.
> 
> Ron N
>