Crown Molding Tools
crownmoldingtools.com
Upside down and backwards in a miter box or compound miter saw has been used
for the last 200+ years by the majority of carpenters to cut
crown molding
miter and bevel angles. Right sideup and backwards for rake crown molding
cuts were developed long before our time, but even today there's still
confusion about the correct crown miter and bevel angles when cutting rake
crown molding laying flat
in the miter box or compound miter saw.
By using plane geometry for developing rake crown molding profiles you can determine the correct miter and bevel angles for rake crown molding.
Trigonometric Relationships between Tetrahedron Angles by Joe Bartok
Joe Bartok's Trigonometric Relationships between Tetrahedron Angles web page is the most significant treatise on roof framing angles in the last 100 years. If your a roof framer print out Joe's Trigonometric Relationships between Tetrahedron Angles web page and study the trigonometric relationships between each of the triangles. If your an interior trim carpenter, then just use the crown angle formulas below.
Trigonometric Crown Angle Formulas for Horizontal Plane Crown Molding Angles
Trigonometric Crown Angle Formulas for Vertical Plane Crown Molding Angles (cathedral/vaulted ceilings/rake gables)

Development of Tetrahedron Geometry based on Joe Bartok's Tetrahedron Developmental Geometry Development of Tetrahedron Geometry Development of Tetrahedron for Crown Molding Geometry Using Spring Angle and Wall Angle Development of Tetrahedron for Crown Molding Geometry Using Slope Angle and Corner Plane Angle Development of Tetrahedron for Crown Rake Molding Geometry 
Crown Moulding Miter Angle and Bevel Angle Settings Calculators Crown Spring Angle = 52° Crown Spring Angle = 45° Crown Spring Angle = 38° Wall Angle Settings Rake Crown Spring Angle = 38° Rake to Horizontal Crown Spring Angle = 38° Polygon 2 Cord Exterior Rake Gable Crown Molding Miter Angle and Bevel Angle Settings Polygon 2 Cord Interior Rake Gable Crown Molding Miter Angle and Bevel Angle Settings Polygon Crown Molding Angles Development & Calculator Octagon Roof Exterior Crown Molding Angles Development Calculators Octagon Roof Interior Crown Molding Angles Development Calculators Corner A Crown Molding Calculator Corner B Crown Molding Calculator Corner C Crown Molding Calculator Corner D Crown Molding Calculator 
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 SBE Builders 5305 Laguna Ct. Discovery Bay, California 94505 (925) 6346022 • Fax: (925) 6346022
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Roof Framing Geometry

Rafter Tools for Android
With Quad Tetrahedra Analytic Algorithm Technology.
Helping apprentice carpenters on their journey to becoming master carpenters with Certification in roof framing.
Crown Molding Tools
crownmoldingtools.com
Canadian & American Geometric Roof Framing Development
using a Steel Framing Square
Geometric Roof Framing Development for Irregular Hip Roof Calculations
using a Steel Framing Square
Geometric Development of Tetrahedron
using a Steel Framing Square
Hip Rafter Backing Bevel Angles from 1565 to 2013