Choose Home tab→Reference group→More Planes→Tangent button.
Select one of the following face types:
When you select a cylinder or cone, the command displays a dynamic representation of the new reference plane. As you move the cursor, the new plane moves around the selected face. For other surface types you must select a keypoint to position the tangent plane.
Define the tangent plane location by doing one of the following:
You can use QuickPick to locate hidden part faces.
As you move the cursor, the angle distance of the dynamic reference plane changes in increments.
You can locate keypoints in 3D space to position the new plane accurately. Use the Keypoints QuickBar options to specify whether you want to locate the end point of a line or part edge, the midpoint of a circle or arc, or a tangency point on a curved analytic face.
If there is more than one possible tangency between the plane and a curved face, a bold line shows which tangency is active as you move your cursor over the face.
You can use the N, B, T, P, and F hot keys on the keyboard to change the orientation of the x-axis. The N key selects the next linear edge as the x-axis. The B key goes back to the previously selected edge. The T key toggles the x-axis origin to the opposite end of the selected edge. The P key selects a base reference plane to define the x-axis. The F key flips the normal direction of the reference plane, which changes the x-axis orientation.