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?
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.
Comment from contributor A:
To calculate angle and bevel for cutting crown, while lying flat, to install on a 22 1/2 degree corner, I have found it easiest to use scrap to determine the angle and bevel of my cuts. Unfortunately, most ceilings, walls and corners are not square, level, or plumb, and I must adjust my cuts accordingly. For 22 1/2 degree corners, I usually have both bevel and angle set somewhere between 14 and 18 degrees. This can vary depending on wall, ceiling, and corner, and the accuracy desired.