Segmented Turning Calculator

Ring segments from diameter, segment count, and angle.

Ring outer diameter (in)

Ring width (in)

Segments per ring

Board thickness (in)

Saw kerf width (in)

Number of rings

Tab to move between fields

Miter angle (deg)

Segment outer edge (in)

2.59

Segment inner edge (in)1.81

Segment width (in)1.5

Board length per ring (in)32.56

Total board length (in)32.56

Inner ring diameter (in)7

Board Width Needed1.56

Ring Height0.75

Outer Circumference31.42

Segment Total Length31.06

Saw Miter Angle15

How to Use This Calculator

How the result changes with Segments per ring

Ring outer diameter (in): Target outer diameter of the assembled ring.
Ring width (in): Radial width of each ring (outer radius minus inner radius).
Segments per ring: Number of segments in each ring. 6, 8, 12, and 16 are common.
Board thickness (in): Thickness of lumber for the segments (becomes ring height).
Saw kerf width (in): Width of your saw blade's cut (1/8" is typical for table saw).
Number of rings: How many identical rings to cut.

Miter angle (deg): Saw blade angle for each miter cut (180 / segments).
Segment outer edge (in): Length of the longest (outer) face of each segment.
Segment inner edge (in): Length of the shortest (inner) face of each segment.
Segment width (in): Width of each segment (radial direction = ring width).
Board length per ring (in): Linear inches of board needed for one ring including kerf waste.
Total board length (in): Total board material needed for all rings.
Inner ring diameter (in): Interior diameter of the assembled ring.

Identify Input Parameters
4 parameters
Ring outer diameter (in) = 10, Ring width (in) = 1.5, Segments per ring = 12, Board thickness (in) = 0.75 = 6 input(s) provided
Calculate Miter angle
Miter angle = 180 / numberOfSegments
15 = 15
Calculate Segment outer edge
2.588 = 2.588
Calculate Segment inner edge
1.812 = 1.812
Calculate Segment width
1.5 = 1.5