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Segmented Bowl Calculator

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A Segmented Bowl Calculator is a specialized tool designed to assist woodworkers and hobbyists in creating beautifully crafted segmented bowls. These bowls are made by joining several wood pieces at precise angles to form a circular shape. The calculator simplifies the complex calculations needed for accurate cutting and assembling of the wood segments.

Purpose and Functionality of the Calculator

The primary purpose of the Segmented Bowl Calculator is to provide precise measurements based on user-inputted values, ensuring each segment fits perfectly with the others to form a seamless bowl. This tool calculates crucial parameters such as the segment length, cutting angle, and the number of rings required based on the dimensions of the bowl that the user intends to create.

Key Inputs and Calculations

  • Diameter of the Bowl (D): Determines how wide the bowl will be.
  • Ring Thickness (T): The thickness of each horizontal layer or ring.
  • Segment Angle (A): The angle at which each segment will be cut.
  • Number of Segments per Ring (N): How many segments make up a single ring.
  • Wall Thickness (W): The thickness of the bowl’s wall.
  • Height of the Bowl (H): Total height of the finished bowl.

From these inputs, the calculator derives:

  • Outside Radius (Ro): The radius on the outer edge of the bowl.
  • Inside Radius (Ri): The radius on the inside edge, directly influenced by the wall thickness.
  • Mid Radius (Rm): The average of the inside and outside radii, crucial for determining the true segment length.
  • Segment Length (SL): The length of the outer edge of each segment.
  • Cutting Angle (C): The angle at which each segment should be cut for proper alignment.
  • Number of Rings (Nr): How many rings are needed to reach the desired bowl height.

Step-by-Step Example

Let’s walk through an example using the Segmented Bowl Calculator:

Example Inputs:

  • Diameter: 12 inches
  • Ring Thickness: 0.5 inches
  • Segment Angle: 30°
  • Number of Segments per Ring: 12
  • Wall Thickness: 0.75 inches
  • Height: 5 inches


  1. Ro (Outside Radius): 6 inches
  2. Ri (Inside Radius): 5.25 inches
  3. Rm (Mid Radius): 5.625 inches
  4. Segment Length: 2×5.625×sin⁡(15∘)2×5.625×sin(15∘)
  5. Cutting Angle: 15°
  6. Number of Rings: 10

The Segment Length and Cutting Angle are essential for cutting the wood accurately, and the Number of Rings tells us how many layers are needed to achieve the height.

Relevant Information Table

InputSymbolExample ValueDescription
Diameter of the BowlD12 inchesTotal width across the bowl.
Ring ThicknessT0.5 inchesThickness of each layer of the bowl.
Segment AngleA30°Angle for each segment.
Number of Segments per RingN12Pieces in each ring.
Wall ThicknessW0.75 inchesThickness of the bowl’s side.
Height of the BowlH5 inchesTotal vertical height of the bowl.


The Segmented Bowl Calculator is an invaluable tool for any woodworker looking to create segmented bowls. It not only ensures precision and ease in calculations but also enhances the overall efficiency and quality of the crafting process. With this calculator, complex projects become accessible and more manageable, even for hobbyists who may not have extensive mathematical background. The result is beautifully crafted bowls that are both structurally sound and aesthetically pleasing.

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