# Cutting crown moulding laying flat

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Calculating angles properly. April 2, 2002

Question
I have recently purchased a sliding miter saw. The manual tells me what degree to set the bevel and miter on to cut crown laying flat for crown cut on a 45 and a 38 degree and how to cut it on a 45 degree angle but it doesn't tell me how to cut a 221/2 degree or how to figure out the bevel or miter setting if the bevel on the crown is not a 45 or a 38 degree. Does anyone know a formula to figure out these problems?

Forum Responses
If you have Excel it can do all the functions. If you set the spreadsheet up right you can figure anything to a high degree of accuracy. Now if the walls and ceiling were straight and plumb you'd be all set.

You don't need to cut crown laying flat. All you have to do to cut crown mould (unless your crown is really big) is use a framing square and measure how far down the crown will come on the wall. The crown I make is 4.25" and it comes down about 3 inches but that can vary with the run. Then make a mark on your saw fence at 3" (or whatever your height is) and turn your saw to the desired angle and make your cut. In all my time installing crown, the only time I have seen it done laying flat was on some exterior crown that was about 12 inches wide and 3 inches thick.