Chines and multi-piece rims

[Farrell]

No sweat. Wednesday. Chicago. I'll be in the front row! Thanks

Terry Farrell
  
----- Original Message ----- 
From: "Delwin D Fandrich" <pianobuilders@olynet.com>
To: <pianotech@ptg.org>
Sent: Monday, March 04, 2002 12:59 PM
Subject: Re: Chines and multi-piece rims


> 
> ----- Original Message -----
> From: "Farrell" <mfarrel2@tampabay.rr.com>
> To: <pianotech@ptg.org>
> Sent: March 03, 2002 5:37 AM
> Subject: Re: Chines and multi-piece rims
> 
> 
> > My thoughts/questions are kinda running like Ed's here. How does a three
> piece case allow improved geometry of the soundboard in the treble area
> (allows you to start out parallel to the rear of the bridge at the treble
> end from the get-go?)?
> -----
> 
> The bend in the treble rim can only be made so tight. With the multi-part
> rim I can put the chine anywhere I want it. And shape the bent side any way
> I want.
> 
> 
> >
> >And how does it affect the bass end to better allow floating of the bass
> end of the soundboard?
> -----
> 
> Again, the bend of the continuous bent-laminate rim can only be made so
> tight.
> 
> 
> >
> > Regarding Ed's questions about the massiveness and/or stiffness of the
> rim, with solid timber sections of rim, is it not the case that all we would
> need to do is increase size of these timbers and/or add framing until we
> have whatever mass/stiffness we feel we need? We know how to join two pieces
> of wood in a rather solid manner, so the fact that a rim is made of separate
> sections should be of no disadvantage. Keep in mind that one full side of
> all soundboards is a separate solid piece of timber - the belly rial (and
> even those are often more than one piece) - although I must admit that I
> have always assumed that this was the weakest part of the case.
> -----
> 
> The belly rail is not actually a solid piece of timber, but a built-up
> Z-shaped section with a number of inherent weaknesses. I've gone into their
> weaknesses many times in my classes and I'll go into some solutions in my
> Wednesday class in Chicago we discuss various aspects of pianobuilding in
> the small shop. I'm not really prepared to write much about it just now.
> 
> Del
> 
> 
>