Tools for Woodworkers

Turning layout

Segmented ring calculator

Lay out equal trapezoidal segments for a closed ring using finished outside and inside diameters. The calculator reports geometry plus a kerf-aware minimum blank length.

Bench calculator

Enter your measurements

No account. No upload. Your entries stay in this tab.

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Verify critical dimensions and machine setups independently before cutting project material.

01 / METHOD

How to use this calculator

  1. Enter segment count and finished outside and inside diameters.
  2. Enter ring thickness and saw kerf.
  3. Cut test segments, dry-clamp the full ring, and adjust before glue-up.

02 / APPLICATION

Useful in the workshop

  • Plan a segmented turning ring
  • Set the miter gauge angle
  • Estimate strip width and length

03 / MODEL

Assumptions

  • Segments are equal, straight-sided trapezoids.
  • Diameters are finished dimensions with no turning allowance.
  • One kerf is allowed between consecutive blanks in a strip.

04 / CHECKS

Limitations and safety

  • Real rings need extra material for truing, sanding, and turning.
  • Small angular errors accumulate around the ring; a digital result cannot calibrate the saw.

Before cutting: independently verify important dimensions, angles, clearances, material behavior, and machine settings. Use safe procedures appropriate to your tools and material.

05 / QUESTIONS

Frequently asked questions

What miter angle closes the ring?

Each segment end is cut at 180° divided by the number of segments.

Should I add turning allowance?

Yes. The entered diameters describe the geometric ring; add material appropriate to your truing and turning process.