Motion-Dimension command and Elements.

You must select three elements when you add a Motion-Dimension FB for a Rocker. They are:

A Pin-Joint...
...followed by two Line sketch-elements.

However, you may find you cannot select one of the Lines to complete the command.

This can happen when:

there is already a Motion-Dimension FB at the Pin-Joint
the Point used by the Pin-Joint is not a child to Line radiating from the Pin-Joint.
the Pin-Joint that you select is not a Pin-Joint between the two Lines you want to select.

Read this topic: Add Motion-Dimension.

Tutorial and Reference Help Files for MechDesigner and MotionDesigner 13.2 + © Machine, Mechanism, Motion and Cam Design Software by PSMotion Ltd