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Wedge

Spiral

Part

A Part Helix is a parametric shape that can be created with the Part Primitives command. In the coordinate system defined by its DatePlacement property, the axis of the helix matches the Z-axis and its bottom point, the start point, lies on the X-axis.

See Part Primitives.

Example

A Part Helix object created with the scripting example below is shown here.

• A Part Helix can be used to create screw threads. See Thread for Screw Tutorial.

Properties

See also: Property View.

A Part Helix object is derived from a Part Feature object and inherits all its properties. It also has the following additional properties:

Data

Attachment

The object has the same attachment properties as a Part Part2DObject.

Coordinate System

• DateLocal Coord (Enumeration): The handedness, or direction, of the helix: Right-handed or Left-handed. The default is Right-handed, meaning the helix turns counterclockwise as it goes up.

Helix

• DatePitch (Length): The distance between two consecutive turns of the helix measured along its Z-axis. The default is 1mm.
• DateHeight (Length): The height of the helix. The default is 2mm.
• DateRadius (Length): The start radius of the helix. The helix has a constant radius if DateAngle is 0°.
• DateSegment Length (QuantityConstraint): The number of turns per helix subdivision. The default is 1, meaning each full turn of the helix is a separate segment. Use 0 to suppress subdivision.
• DateAngle (Angle): The angle that defines of the outer shape of the helix. Valid range: -90° < value < 90°. The default is 0°. If it is 0° the helix is cylindrical, else it is conical.

Scripting

See also: Autogenerated API documentation, Part scripting and FreeCAD Scripting Basics.

A Part Helix can be created with the addObject() method of the document:

helix = FreeCAD.ActiveDocument.addObject("Part::Helix", "myHelix")

• Where "myHelix" is the name for the object.
• The function returns the newly created object.

Example:

import FreeCAD as App

doc = App.activeDocument()

helix = doc.addObject("Part::Helix", "myHelix")
helix.Pitch = 2
helix.Height = 3
helix.Radius = 4
helix.SegmentLength = 21
helix.Angle = 45
helix.Placement = App.Placement(App.Vector(1, 2, 3), App.Rotation(75, 60, 30))

doc.recompute()

Wedge

Spiral

Part