Cutting rib radii

[Fenton Murray]

Jude R. posted photos of one he made some time back.
Fenton
----- Original Message ----- 
From: "David Love" <davidlovepianos at comcast.net>
To: "'Pianotech List'" <pianotech at ptg.org>
Sent: Thursday, August 07, 2008 6:08 AM
Subject: RE: Cutting rib radii


>I know it is done that way but when you bend wood I don't think it really
> bends in a uniform radius, it tends to bend more in the middle and less 
> out
> toward the ends, I guess the shape is more parabolic.  Also, each piece of
> wood will probably bend somewhat differently.  Since some of the curves 
> I'm
> using are fairly tight (especially on the short ribs) I'd prefer to use a
> preshaped caul of some type.  The jig set up to translate the shape of 
> that
> caul to the rib with a router (rather than using a bandsaw and sandpaper) 
> is
> really the question.
>
> David Love
> davidlovepianos at comcast.net
> www.davidlovepianos.com
>
> -----Original Message-----
> From: pianotech-bounces at ptg.org [mailto:pianotech-bounces at ptg.org] On 
> Behalf
> Of Richard Brekne
> Sent: Thursday, August 07, 2008 12:11 AM
> To: pianotech at ptg.org
> Subject: Cutting rib radii
>
> Ribs are bendable enough that you can bend them to the exact radii you
> want, clamp them in place and remove material from the concave side so
> as to make that side flat. Unclamping will then leave that flattened
> convex line at exactly the radii you want. You can put in some fairly
> complex curves this way as well as long as your bends are not over too
> short a span to hold adequately.
>
> Cheers
> RicB
>
>
>
>