Why piano tuning pin bushings?

[Farrell]

The pins press on the plate and complete the circle of sound silly.

Terry Farrell
  
----- Original Message ----- 
From: <Kdivad@aol.com>
To: <pianotech@ptg.org>
Sent: Thursday, October 24, 2002 12:08 PM
Subject: Re: Why piano tuning pin bushings?


> In a message dated 10/24/02 9:15:04 AM Central Daylight Time, 
> Erwinspiano@aol.com writes:
> 
> 
> > 
> > >> 
> >> Bolduc uses the question in his classes ,
> >> "What is heavier, a piano with tuning pin bushings or 
> >> a piano without tuning pin bushings?" 
> >> Much heavier with bushings.....
> >> all that extra iron for extra plate tension.
> >> 
> >>                                Dave Renaud
> > 
> 
> I'm not sure I get it,  where does the extra plate tension come from with 
> bushings?  I can imagine a little pressure at the webbing but over all the 
> same tension at pitch.  Are we talking about the different position of the 
> tension, some at the holes versus the flange?  Doesn't the fact that there 
> are screws through the plate into the top of the pinblock transfering some 
> tension in the same direction as pins riding holes or bushings negate that 
> idea?  Could comeone please enlighten me?
> 
> David Koelzer
> Vintage Pianos
> DFW
>