rib crowning

[Greg Newell]

Greetings list members,
    I am in the process of learning how to go about pre-crowning ribs
for use in a new soundboard installation. I have seen at least one jig
which seems to cut the rib with the crown directly in the center of the
rib which will not necessarily be under the bridge. As I understand it
it makes the most sense, at least to me, to have the thickest part of
the rib directly under the bridge for the maximum support. Am I correct
in assuming (Ooo there's that word again) that a different degree of
taper exists from one side of the bridge to the rim than the other?  Am
I correct in noting that the rib thickness at 3 inches from the bridge
on either side would not necessarily be the same? If this is the case
(on a middle rib for examples sake) then how does one go about laying
out an even taper but with different degrees on either side? Does any of
this make any sense at all? Am I even on the right track?

--
Greg Newell
mailto:gnewell@ameritech.net