Click Helix
in the Wireframe toolbar (Curves sub-toolbar).
The Helix Curve Definition dialog box appears.
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In the Starting Point box, select a point.
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In the Axis box, select an axis.
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Set the helix parameters.
Click Reverse Direction to invert the curve
direction.
Click OK to create the helix.
The helical curve (identified as Helix.xxx) is added to the
specification tree.
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