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Coordinates

Bolt Circle Coordinate Calculator

Lay out equally spaced hole centers around a full bolt circle. Coordinates are generated from the entered center with 0° along positive X.

LOCAL CALC / BOLT-CIRCLE
NO DATA SENT

INPUT

Enter values

OUTPUT

READY

Enter known values and calculate.

Results stay on this device.
Shop-floor check

Verify drawing units, datum, work offset, axis direction, rotation convention, and coordinate rounding. Simulate or dry-run machine motion before cutting.

01 / METHOD

How to use this calculator

  1. Enter hole count and bolt circle diameter in any consistent length unit.
  2. Set start angle, rotation direction, and optional center offset.
  3. Calculate and transfer coordinates only after checking signs and datum.

02 / APPLICATION

Where it helps

  • Manual mill coordinate layout
  • Checking CAM hole locations
  • Creating inspection coordinate lists

03 / BOUNDARIES

Assumptions and limitations

Assumes

  • Equal angular spacing over 360°
  • 0° is positive X
  • Conventional Cartesian coordinates with positive Y upward

Does not cover

  • Does not generate G-code
  • No compensation for rotary-axis conventions
  • Displayed rounding must suit the drawing tolerance

04 / QUESTIONS

Frequently asked questions

What unit are the coordinates?

They use the same length unit as bolt circle diameter and center offsets. The calculator is unit-agnostic because no length conversion is needed.

Where is zero degrees?

Zero degrees lies on the positive X axis. Counterclockwise 90° lies on positive Y.

Can I paste these directly into a CNC?

Treat them as reference values, not verified code. Check work coordinates, units, rounding, tool path, and machine conventions first.