Bolt Hole Circle Calculator 

Tool Limitations and Instructions

• Purpose: This tool is designed to calculate the precise coordinates and orientation angles of holes evenly spaced on a bolt hole circle. It is intended for preliminary design and reference purposes only.
  
  

• Input Requirements:
  
  

  • Circle Diameter: Must be a positive number representing the diameter of the bolt hole circle.
    
    

  • Number of Holes: Must be a positive integer greater than zero.
    
    

  • Starting Angle: Angle in degrees from the reference direction (usually the positive X-axis). Can be any real number; values will be normalized between 0° and 360°.
    
    

  • Direction: Choose clockwise or counterclockwise hole arrangement around the circle.
    
    

  • Center Coordinates (X₀, Y₀): The center of the bolt hole circle in the selected unit system.
    
    

• Unit Conversion: Supports millimeters (mm) and inches (inch). When switching units, input values will be converted automatically. Ensure consistency when inputting dimensions.
  
  

• Output Details:
  
  

  • Displays the X and Y coordinates of each hole relative to the specified center.
    
    

  • Shows the orientation angle of each hole, which indicates its angular position on the circle.
    
    

• Assumptions & Limitations:
  
  

  • The tool assumes holes are perfect circles placed on a perfect circle. It does not support elliptical or other shaped holes.
    
    

  • Orientation angles are for reference only; for circular holes, orientation does not affect the hole shape.
    
    

  • This calculator does not generate CAD files or drilling templates. Use outputs as coordinate references.
    
    

  • Environmental factors, manufacturing tolerances, and material considerations are outside the scope of this tool.
    
    

• Usage Recommendations:
  
  

  • Double-check all input parameters before calculation.
    
    

  • Use the output coordinates to assist in CAD modeling or CNC programming.
    
    

  • For detailed manufacturing drawings, consult with design engineers or CAM specialists.
    
    

• Disclaimer:
  
  

  • The results provided are approximate and for guidance purposes. Actual manufacturing requirements may vary and should be verified by qualified personnel.