Try this link it might help.

http://www.dewalt.com/us/articles/ar...odworking&ID=2


On Sep 4, 12:09 am, Hubert wrote:
I am trying to fit 5" crown molding (38 degree spring angle) around an
outside bullnose. I've been trying to use a compound miter saw to cut
at 22.5 degrees but have been doing something wrong because I end up
with too small of an angle when I stick the three pieces together.
Can somebody tell me what settings I need to have on my miter saw? I
have the miter set at 22.5. Does the bevel setting also need to be at
22.5? How does one calculate this? Thanks!
H.