Design Guidelines for Circular and Slotted Holes

Circular Hole Design Recommendations

Straight Holes

• General Tolerance Holes (Straight Holes)
  Holes without specified tolerances (general precision) are typically referred to as "straight holes."

  • For non-precision straight holes (drilled):
    • Recommended hole diameter: ≤ Φ20mm.
    • Recommended depth: ≤ 10 times the drill diameter.
  • For straight holes with a diameter > Φ20mm (milled):
    • Recommended depth: ≤ 4 times the milling cutter diameter.

• Precision Holes

  • For precision holes with a diameter ≤ Φ20mm:
    • Typically finished with a reamer, with a recommended depth of ≤ 5 times the hole diameter.
  • For precision holes with a diameter > Φ20mm:
    • Processed using milling or boring tools, with a recommended depth of ≤ 80mm.

To specify a precision hole in the 3D design interface, you can double-click the hole specification to add tolerances. Side surfaces can also be set to a surface roughness of Ra1.6 (Rz6.3).

Threaded Holes

For coarse or fine-threaded holes, the recommended effective thread depth is generally ≤ 3 times the nominal diameter.

By following these guidelines, you can ensure that hole designs meet manufacturing feasibility while maintaining optimal performance and precision.