At 07:52 AM 06/02/2002 -0400, you wrote: >I quackulate just about 1.5 mm. I guess this would all work out. If the >board had 1.5 mm of crown in the middle (or perhaps a bit more assuming they >dried the board down a bit prior to ribbing - so maybe 2 or even 3 mm or >so), then perhaps it had 1 or 1.5 mm of crown after stringing and had the >positive bearing indicated below, and now it has sagged down a bit. I >realize we cannot say with any certainty what exactly has happened, but this >would seem logical??? Logical, but maybe a tad optimistic. Deflection under string load would depend on panel compression and rib cross section and material too, naturally. >Is that what Baldwin used - 72-foot radius ribs over the whole soundboard? Yes, still do as far as I know, though I'm not sure just when they adopted it. I think they've used 72' for a very long time. >Did they dry the board down pretty far to get a fair bit of compression crown? Yes, and still do. Ron N
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