Part Helix/pl: Difference between revisions

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== Description ==
== Description ==


A [[Image:Part_Helix.svg|24px]] '''Part Helix''' is a parametric shape that can be created with the [[Image:Part_Primitives.svg|24px]] [[Part_Primitives|Part Primitives]] command. In the coordinate system defined by its {{PropertyData|Placement}} property, the axis of the helix matches the Z axis and its bottom point, the start point, lies on the X axis.
The {{Button|[[File:Part_Helix.svg|16px]] [[Part_Helix|Part Helix]]}} geometric primitive creates a helix shape, defined by a radius, a pitch, and a total height.


[[Image:Part_Helix_Example.png|400px]]
A common usage for the helix primitive is for [[Thread_for_Screw_Tutorial|creating screw threads]] in conjunction with a closed profile, and the {{Button|[[Image:Part_Sweep.svg|16px]] [[Part_Sweep|Sweep]]}} operation. This process works essentially the same in the [[PartDesign_Workbench|PartDesign Workbench]] by using the {{Button|[[File:PartDesign_AdditivePipe.svg|16px]] [[PartDesign_AdditivePipe|PartDesign Additive pipe]]}} tool.


== Usage ==
== Usage ==


See [[Part_Primitives#Usage|Part Primitives]].
# Switch to the [[Image:Workbench_Part.svg|24px]] [[Part_Workbench|Part Workbench]].
# The Create Primitives dialogue can be accessed several ways:
#* Pressing the {{Button|[[File:Part_Primitives.svg|16px]] [[Part_Primitives|Primitives]]}} button located in the Part toolbar.
#* Using the {{MenuCommand|Part → [[File:Part_Primitives.svg|16px]] [[Part_Primitives|Create primitives]] → Helix}} entry in the Part menu.


== Example ==
[[File:PartHelixPrimitivesOptions_en.png]]


[[Image:Part_Helix_Scripting_Example.png|thumb|Part Helix from the scripting example]]
====Parameter====


A Part Helix object created with the [[#Scripting|scripting example]] below is shown here.
⚫
* {{Parameter|Pitch:}}The pitch corresponds to the space between two consecutive "turns" of the helix measured along the main axis of the helix.
* {{Parameter|Height:}} The height corresponds to the overall height of the helix measured along the main axis of the helix.
* {{Parameter|Radius:}} The radius corresponds to the radius of the circle built by the helix by viewing the helix from the top or bottom.
* {{Parameter|Angle}}: Per default the helix is built on a imaginary cylinder. With this option it is possible to build the helix on a imaginary cone. This angle corresponds to the angle of the cone. The value must be comprised between 0 and +90 deg.
* {{Parameter|Right-handed or Left-handed:}} This parameter specifies the [https://en.wikipedia.org/wiki/Screw_thread handedness] of the helix.


====Location====
== Notes ==


* A Part Helix can be used to create screw threads. See [[Thread_for_Screw_Tutorial|Thread for Screw Tutorial]].
* {{Parameter|X:}} The main axis of the helix will be translated along the x axis of the value you indicate in this field.
* {{Parameter|Y:}} The main axis of the helix will be translated along the y axis of the value you indicate in this field.
* {{Parameter|Z:}} The main axis of the helix will be translated along the z axis of the value you indicate in this field.
* {{Parameter|Direction:}} Per default the main axis of the helix is the z axis. Here you have the possibility to edit the main axis of the helix. If you select the parameter "user defined..." , you will be invited to indicate the main axis of the helix by entering the coordinates of its vector.
* {{Parameter|3D View:}} allows you select center in the 3D view


== Options ==
== Properties ==


See also: [[Property_editor|Property editor]].
⚫
=== Properties ===

Once you have created the helix you have the possibility to edit its parameters.
A Part Helix object is derived from a [[Part_Feature|Part Feature]] object and inherits all its properties. It also has the following additional properties:
{|

| [[File:PartHelixProperty_en.png]]
⚫
=== Data ===
|

The parameters in this menu are similar to those described above.<br />
{{TitleProperty|Attachment}}
{{KEY|Base}}<br />

* {{Parameter|Placement:}} allows you to move or rotate the helix
The object has the same attachment properties as a [[Part_Part2DObject#Data|Part Part2DObject]].
* {{Parameter|Angle:}}

⚫
|}
{{TitleProperty|Coordinate System}}

* {{PropertyData|Local Coord|Enumeration}}: The [https://en.wikipedia.org/wiki/Screw_thread handedness], or direction, of the helix: {{Value|Right-handed}} or {{Value|Left-handed}}. The default is {{Value|Right-handed}}, meaning the helix turns counterclockwise as it goes up.

{{TitleProperty|Helix}}

⚫
* {{PropertyData|Pitch|Length}}: The distance between two consecutive turns of the helix measured along its Z axis. The default is {{Value|1mm}}.
* {{PropertyData|Height|Length}}: The height of the helix. The default is {{Value|2mm}}.
* {{PropertyData|Radius|Length}}: The start radius of the helix. The helix has a constant radius if {{PropertyData|Angle}} is {{Value|0°}}.
* {{PropertyData|Segment Length|QuantityConstraint}}: The number of turns per helix subdivision. The default is {{Value|1}}, meaning each full turn of the helix is a separate segment. Use {{Value|0}} to suppress subdivision.
* {{PropertyData|Angle|Angle}}: The angle that defines of the outer shape of the helix. Valid range: {{Value|-90° &lt; value &lt; 90°}}. The default is {{Value|0°}}. If it is {{Value|0°}} the helix is cylindrical, else it is conical.

== Scripting ==

See also: [https://freecad.github.io/SourceDoc/ Autogenerated API documentation], [[Part_scripting|Part scripting]] and [[FreeCAD_Scripting_Basics|FreeCAD Scripting Basics]].

A Part Helix can be created with the {{Incode|addObject()}} method of the document:

{{Code|code=
helix = FreeCAD.ActiveDocument.addObject("Part::Helix", "myHelix")
⚫
}}

* Where {{Incode|"myHelix"}} is the name for the object.
* The function returns the newly created object.

Example:

{{Code|code=
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()
}}




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Revision as of 10:17, 3 March 2022

Other languages:

Part Helix

Menu location
Part → Create primitives → Helix
Workbenches
Part, OpenSCAD
Default shortcut
None
Introduced in version
-
See also
Part Primitives

Description

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

Usage

See Part Primitives.

Example

Part Helix from the scripting example

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

Notes

Properties

See also: Property editor.

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

  • DANELocal 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

  • DANEPitch (Length): The distance between two consecutive turns of the helix measured along its Z axis. The default is 1mm.
  • DANEHeight (Length): The height of the helix. The default is 2mm.
  • DANERadius (Length): The start radius of the helix. The helix has a constant radius if DANEAngle is 0°.
  • DANESegment 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.
  • DANEAngle (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()


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