About Twisted Profile Angle content in Workshop Documents

You can use this to provide the capability to determine twist angle and export this information in Workshop documents.

The ways in which to determine twist angle for twisted profiles:

  • Section Axis Definition - Each profile has a section axis composed of Web Face normal (H), Flange Face Normal (V) and, the Third direction (T) which is along the tangent direction of the Profile trace.

  • Nomenclature:

    H: Normal to WebInner- face of profile and pointing to WebInner+ face.

    V: Normal to Molded Flange2 face of profile and pointing to MoldedFlange1 face.

    T: Line Tangent to Profile trace.

  • Twist Angle Measurement - Looking into the direction of the Profile trace (from End of profile to Start of Profile), we see the cross section of End Face of Profile at an angle to the Start Face of Profile.

    Twist angle = Angle measure from H Axis of End Section to H Axis of Start Section. Angle measures counterclockwise while looking from the End section toward the Start section.

    The display of angle value in Workshop documents is as per the Units defined in preferences.

    1. Straight Profile trace - For this data, the Tangent direction of Section axis at start and end of profile are collinear. Hence the Twist angle is equal to the angle measured between the H direction of the Section axis at start and end.
    2. Curved Profile trace - The MoldedFlange2 face and WebInner- face of profile are nonplanar.

      Computation of the Twist angle with the following steps:

      • Translate the Section axis at start to origin of Section axis at End of profile.
      • Rotate the translated Start section axis such that the Tangent (T) the line of the Start Section axis is collinear with the Tangent (T) line of the End Section axis.

      At the end of these translation and rotation maneuvers, the result.

      By Viewing in the direction opposite to the Profile Tangent Trace at the Profile end, we see the following twist in the Profile section.

      Twist angle = The angle measured in counterclockwise between the H direction of the Section axis. Example between HE and H`S in this case.