Pre-crowning ribs

Graeme Harvey gharvey@netsource.co.nz
Sun, 17 Mar 2002 13:00:37 -0000


List,

A tech friend and myself are rebuilding two identical Bechstein A's. We've
made (glued) up the soundboard panels and are ready to thichness and sand
them along with prepare (precrown) the ribs. We are on the search for an
appropriate method including jigs to do this job. We have plans for one
method, but it may not be the best way to do the job.

My questions are... What system or jig arrangement do the seasoned
soundboard folk use for shaping (precrowning) the ribs?
Also for this model piano are there improvements to be made in altering
(reducing) the soundboard thickness?
We are going to increase the rib height from the original minimal 19mm to
somewhere near 23 to 24mm, but will be happy to incorporate advice and
suggestions from those of you familiar with this model piano and who have
successfully altered / improved some of the original soundboard / rib specs.

Any input here would be very welcome.

Thanks,

Graeme Harvey
New Plymouth
New Zealand.



This PTG archive page provided courtesy of Moy Piano Service, LLC