I-Home improvement

[Bull_Dolphin]

Never mind, I asked too soon...
For anyone else interested, I found it here:

http://www.woodweb.com/knowledge_base/Installing_crown_moulding.html

The formulas cut and pasted from this article are:

"Enter this in your favorite spreadsheet.

compound miter formula - entered in row 15

cell 1 - slope a in degrees

cell 2 - A15*PI()/180

cell 3 - slope b in degrees (note: slopes a and b will be the same when figuring crown molding)

cell 4 - C15*PI()/180

cell 5 - wall angle in degrees

cell 6 - E15*PI()/180

cell 7 - ATAN((COS(B15)*TAN(D15)+SIN(B15)*COS(F15))/SIN(F15))

cell 8 - G15*180/(PI()) miter cut in degrees

cell 9 - ATAN((COS(D15)*TAN(B15)+SIN(D15)*COS(G15)/SIN(G15)))

cell 10- 90-(I15*180/(PI())) bevel cut in degrees"

I haven't validated these as yet, but they look promising.

regards