Get the miter and bevel for crown cut flat on the saw from your corner and spring angle.
How it works
Miter = arctan(sin spring × tan half turn). Bevel = arcsin(cos spring × sin half turn). Half turn is half of 180 minus the corner.
Before you order
- Check the spring angle on the back of the molding, since many crowns are 38 or 45 degrees.
- Cut a test pair from scrap and hold it in the actual corner.
- Mark which way is the top before you set the piece on the saw.
Common questions
What is the setting for 38 degree crown?
31.6 degree miter and 33.9 degree bevel at a 90 degree corner.
Why can my corner not be 90?
Few room corners are exactly 90, so measure before you cut a long run.