Understanding Spring Angle
Crown molding is unique because it sits at an angle between the wall and ceiling, creating a cove-like transition. The spring angle is the angle the flat back of the crown makes with the wall—most residential crown is either 38 degrees or 45 degrees. This spring angle determines the compound miter settings. For 38-degree spring crown on a 90-degree corner: set the miter saw to 31.6 degrees miter and 33.9 degrees bevel. For 45-degree spring crown: 35.3 degrees miter and 30 degrees bevel. However, there's a much simpler method: cut crown 'nested'—place it upside down and backward on the miter saw, resting against the fence (representing the ceiling) and the table (representing the wall). Then cut simple 45-degree miters. This method eliminates compound angle math entirely.