Machining a bolt hole circle (Pitch Circle Diameter or PCD) manually used to require extensive trigonometry and referencing sine/cosine tables. Today, a good calculator does the heavy lifting.
What You Need to Know
To calculate the exact X and Y coordinates for a bolt hole pattern, you only need three variables:
- The center point (X0, Y0 is usually easiest).
- The diameter of the bolt circle (PCD).
- The total number of holes required.
Get X/Y Coordinates Instantly
Use our dedicated PCD calculator to instantly generate precise coordinates for your CNC mill.
Open PCD Calculator