螺栓圓（PCD）計算機
Generate equally spaced bolt-hole center coordinates for CNC drilling from pitch-circle diameter, hole count and start angle.
結果是根據上述輸入參數計算得出的；範例數值僅供說明之用，並非針對特定工具的速度／進給建議。.
公式與計算方法
Xi = Cx + (PCD/2) cos(θ0 + i × 360°/N); Yi = Cy + (PCD/2) sin(θ0 + i × 360°/N).
Pitch-circle drilling uses polar coordinates to place evenly spaced hole centers around a circle. The first hole starts at the entered angle measured counterclockwise from positive X. The center coordinates can be offset from the machine zero point.
重要假設與限制
The coordinate list is informational, not a verified CNC program. Verify work offsets, fixture orientation, rotation direction, axis sign conventions and hole clearances before machining.
常見問題
Are the angles measured clockwise?
Positive angles are counterclockwise from +X in the conventional XY coordinate system.
Can I use this as G-code?
No. These are hole-center coordinates only; generate and prove out the machine-specific program separately.
技術參考資料： Machining Doctor — Online Machining Calculators. 針對 ONMY 的計算是獨立進行的；來源連結並不代表任何背書。.
