• Geometric Tolerances/Home
  • Position Tolerance
    • Shaft:without modifier
    • Hole: without modifier
    • Composite Frames
    • Position + Orientation Tolerance
  • Position Tolerance with Modifiers
    • Shaft: M modifier
    • Hole: M modifier
    • Shaft: L modifier
    • Hole: L modifier
  • Orientation Tolerance
  • Flatness Tolerance
    • Flatness on a Resting Face
    • Flatness on a Feature of Size
  • Straightness Tolerance
  • Profile Tolerance
    • Equally Disposed
    • Unequally Disposed
    • Composite Frame
  • Concentricity & Runout
    • Concentricity Tolerance
    • Runout Tolerance

Straightness Tolerance on a Feature of Size

Straightness is a Form tolerance. By default, Form tolerances refine size tolerances, and are consumed within the envelopes of size. Hence once the size tolerances are accounted for, a separate accounting of a Form tolerance is not required in DVA. Special cases of Form tolerances however require a separate accounting of the tolerance towards DVA.

Straightness on a Feature of Size median plane/ axis expressed with a Modifier or expressed RFS.

This case shows the impact of Straightness tolerance on a Feature of Size. It shows the largest and smallest envelopes that the Feature would describe.