Hi John, I noticed that.. tho I suppose its possible to find a split table for both somewhere or another. While I got your ear, perhaps you might straighten me out on whats being loaded how... I suppose the ribs restrictions loads the panel radially... against the tangental face ??....even tho this is being done by restricting the outward expansion of the radial face. But then downbearing... Ok that also affects the stress between the ribs and underside of the panel, but isnt there some tangential loading going on here as well ?... or is that just confusion and all the loading is in the same direction ? RicB. John Hartman wrote: > John Hartman wrote: > > > > I looked and you'r right. The 580 comes from "Wood as an Engineering > > Material". Hoadly's is more resent, in the revised addition, so maybe it > > reflects the new standard. Some of the other figures have been changed > > as well. Check his book for an explanation, I recall there was something > > about this in his book. > > John Hartman RPT > > One other point; these figures don't specify if they are for radial or > tangential compression. This would made a bit of difference with spruce. > Hoadle gets into this but no figures are offered. > > Keep reading Richard! > > John Hartman RPT > > John Hartman Pianos [link redacted at request of site owner - Jul 25, 2015] > Rebuilding Steinway and Mason & Hamlin > Grand Pianos Since 1979 > > Piano Technicians Journal > Journal Illustrator/Contributing Editor [link redacted at request of site owner - Jul 25, 2015] > > _______________________________________________ > 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
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