If you cut the crown molding "upside down and backwards", you only need to set your saw to 45 degrees. This method places the molding on your saw the same way it sits on the wall, only "upside down". Since the molding is upside down, the cutting angle is then "backwards" from what you would think. There are alot of sites(www.mitermaster.com)that will help walk you through this way of cutting molding and it is the only way I will cut crown molding. You can easily guarantee a 45 degree angle but you can't a 32.8 degree angle or whatever you need for your molding. Good Luck on your project. The final product is worth the aggravation!