The Geometry of Hidden Joints

Hidden joinery relies on precise angles to distribute stress evenly across the joint.

The Math Behind Hidden Joints

• Calculate the miter angle by dividing the number of sides of the frame by two.
• Use a sliding T bevel to transfer complex angles from one component to another.
• Verify the angle with a protractor before cutting to prevent gaps in the finished piece.

Choosing the Right Angle for Strength

• Understand that steeper angles generally provide more mechanical interlock than shallow angles.
• Apply glue to the mating surfaces immediately after checking the angle for fit.
• Use clamps to hold the joint together until the adhesive cures completely.

Geometry is the invisible language that holds the structure together.