To add a screw mate:
Click Mate (Assembly toolbar) or Insert, Mate.
In the PropertyManager, under Mechanical Mates, click Screw .
Under Mate Selections, select the rotation axes on the two components for Entities to Mate .
Under Mechanical Mates:
Revolutions/<length_unit>. Sets the number of revolutions of one component for each length unit the other component translates. (See Units Options to set the document's unit of length.)
Distance/revolution. Sets the distance that one component translates for each revolution of the other component.
Reverse. Changes the direction of movement of the components relative to each other.
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