Rib Curve Jig Pictures (Modified by Kent Swafford)

[Richard Brekne]

Yes... this will do the  trick nicely.

I'd thought of doing things the other way around. Force a bend in the rib
itself in the opposite direction, and then run the concave side through a
band saw... then release the rib from its contraints.

Nicely done tho

Cheers
RicB

Absolute Piano wrote:

> Hi All,
>
> Thanks for all the input. Here are some pictures of the adjustable rib
> curving jig. It is fairly basic. There are two runners for the router
> attached to a U bolt. The U bolt is is tensioned by a turnbuckle
> forcing the runners into a curve. I have two capstans underneath the
> middle of the runners for fine adjustments and to support the weight of
> the router. There is also a clamping system to hold the rib in place. I
> only crown the top four spruce ribs and this method gives me a much
> better curve and parallel sides than my old method of using a belt
> sander.
>
> I always assumed that the 60' in the 60'circle that is always discussed
> as the template for piano soundboards was circumference =60'. So what
> is the60'? C, D or r?
>
> Thanks, Jude
>
> https://www.moypiano.com/ptg/files/attachments/7b/35/9d/91/
> RibCurveJig1.jpg
>
> https://www.moypiano.com/ptg/files/attachments/1d/65/ff/99/
> RibCurveJig2.jpg
>
> http://tinyurl.com/22dmp
>
> http://tinyurl.com/2zra7
>
> _______________________________________________
> pianotech list info: https://www.moypiano.com/resources/#archives

--
Richard Brekne
RPT, N.P.T.F.
UiB, Bergen, Norway
mailto:rbrekne@broadpark.no
http://home.broadpark.no/~rbrekne/ricmain.html
http://www.hf.uib.no/grieg/personer/cv_RB.html