I cannot add an Angle (or Linear) Motion-Dimension FB. Why?

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I cannot add an Angle (or Linear) Motion-Dimension FB. Why?

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.