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Motion-Dimension: Commands and Elements.

You must select three elements when you add a Motion-Dimension FB as 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 at the Pin-Joint is not a child to the Line that radiates 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.