Helix Curve

(3D only) Used to place a helix (3D B-spline curve).

You can access this tool from the following:

Setting	Description
Thread	Can be right or left.
Axis	Sets the direction of the helix's axis. Points — Lets you define the direction of the axis graphically. Screen X, Y, or Z — Sets the direction of the axis parallel to the Screen X, Y, or Z axis. Drawing X, Y, or Z — Sets the direction of the axis parallel to the Drawing, or DGN file's X, Y, or Z axis.
Orthogonal	If on, the helix is orthogonal.
Top Radius	If on, sets the second radius.
Base Radius	If on, sets the first radius.
Height	If on, sets the height.
Pitch	If on, sets the pitch.
Tolerance	Sets the tolerance.

Key-in: PLACE HELIX