I bought a tool called an angle divisor at Menard's for about ten bucks that
helps in measuring such. It actually seems pretty accurate or at least close
enough for that kind of measuring. The link below is what it looks like and
you can check your local stores if interested. --- Steve

http://www.screwfix.com/app/sfd/cat/pro.jsp?id=66588

"Squarei4dtoolguy" wrote in message
oups.com...

andy wrote:
do you need a compound miter saw to cut
crown mouldings or just use 45 and block the bottom to fit square to back
and bottom of miter saw,

If you are using the upside down method of cut, you do not need a
compound miter saw. But check your corners as they may not be true 90
degree angles.

Tom in KY, there are crooked houses everywhere.