Applying Torsion Continuity Relations

You can apply torsion continuity relations between splines and any other sketch entity in 2D sketches. The sketch entities must share an end point. These relations create a smooth continuity at the end point and apply equal curvature and an equal rate of curvature to the sketch entities.

You can apply torsion continuity relations to a spline and one of these sketch entities:
  • Spline
  • Arc
  • Conic or elliptical arc
  • Model edges that are linear, circular, conic, parabolic, elliptical, or spline-based

To apply torsion continuity relations:

  1. Select a plane and open a sketch.
  2. Click Style Spline (Sketch toolbar) or Tools > Sketch Entities > Style Spline .
  3. Sketch a spline.


  4. Right-click the spline and click Show Curvature Combs.
  5. Click 3 Point Arc (Sketch toolbar) or Tools > Sketch Entities > 3 Point Arc .
  6. Sketch an arc that shares common end point with the spline.


  7. Right-click the arc and click Show Curvature Combs.
  8. Ctrl + select the spline and arc.
    The Add Relations/Properties PropertyManager appears.
  9. In the Add Relations/Properties PropertyManager, under Add Relations, click Torsion Continuity .
  10. Click .


    The result is a smooth continuity with equal curvature and equal rate of curvature at the shared end point between the spline and arc.