The Feature Angle measure outputs the nominal value and variation of the angle between two features. All feature types are supported but not recommended for sphere or edge. The angle value is calculated as the cross product of the two features' vectors following the right-hand rule.

Inputs:

Measure Type: Feature Angle - measurement between two features, reporting degrees.

Geometry Requirement: CAD Surfaces (Planes/Cylinders/Slots or Tabs. Add one feature for each side of the angle to be measured.

Direction Type: Auto (Default), calculated as the cross product of the two features' vectors following the right-hand rule, or Custom Direction (set by the user).

Spec Limits: Recommended, expressed in degrees.

FeatureAngle

Procedure:

1.Pick the feature for Feature 1.

2.Pick the feature for Feature 2.

3.Specify the Upper and Lower Spec Limits.

4.Specify the Spec Limit. Relative is set to default.

5.Check the current value of the measure: Use Nominal Build to update the measure Current value. Users can also use Deviate to see the deviation caused by tolerances in the Current value.

6.Or use the [Add All] button to pick both features.

7.Optional: activate the Custom Direction option and pick the [Pick Direction] button.

Cases and Best Practices:

Rules: Cross Product direction calculation. (70614)

If 90° > Nominal (after Offset) > -90° Then use +180°/-180°

If 180° > Nominal (after Offset) > 90° Then use +360°/0°

If -90° > Nominal (after Offset) > -180° Then use 0°/-360°

Example of Nominal Direction	Example of deviation direction and the Calculated Direction