Std Part

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Revision as of 23:25, 11 January 2020 by Vocx (talk | contribs) (A Std Part was developed to be used in assemblies, as one of its principal characteristics is that it has an Origin object which includes local X, Y, and Z axes, and standard planes. This Origin can serve as the reference to position and attach objects)
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Std Part

Menu location
None
Workbenches
All
Default shortcut
None
Introduced in version
0.17
See also
Std Group, PartDesign Body

Description

Std Part is a general purpose container that keeps together a group of objects so that they can be moved together as a unit in the 3D view.

A Std Part was developed to be used in assemblies, as one of its principal characteristics is that it has an Origin object which includes local X, Y, and Z axes, and standard planes. This Origin can serve as the reference to position and attach other objects inside the Std Part. The Std Part is principally envisioned to contain objects with a solid Part TopoShape, like Part Primitives and PartDesign Bodies, and other Std Parts in order to create complex arrangements of sub-assemblies. Nevertheless, it can also contain other objects like Mesh objects and Sketches.

The Std Part tool is not defined by a particular workbench, but by the base system. It is found in the structure toolbar.

Left: elements inside a Std Part in the tree view. Right: objects arranged in space, referred to the Origin defined by a Part.

Example uses

  • As an assembly container that groups objects to be manufactured separately then glued or screwed together, like a wooden table.
  • When importing a STEP assembly in FreeCAD, the main assembly and its sub-assemblies are Part containers.
  • A part that is composed of multiple non-fused components, like a ball bearing.

Active Status

A FreeCAD document can contain multiple Parts. Only one Part can be active at a time. An active Part will be displayed in the tree with a light blue background color.

File:Std Part-tree-active.png

Origin

The Origin consists of the three standard axes (X, Y, Z) and three standard planes (XY, XZ and YZ). Sketches can be attached to these planes. All elements inside the Part are referenced to the Part's Origin; which means that the Part can be moved and rotated in reference to the global coordinate system without affecting the placement of elements inside it.

File:PartDesign Body tree-02.png

Visibility Management

The Part's visibility supersedes the visibility of any object it contains. If the Part is hidden, the objects it contains will be hidden as well, even if their visibility is set to true. Multiple objects inside a Part can be visible at a time.

How to use

  • Press the Create part button in the toolbar. The Part automatically becomes active.
  • Double-click the Part in the Model tree to activate or deactivate it.
  • To add objects to a Part, drag & drop them over the Part in the Model tree.
  • To remove objects from a Part, drag & drop them out of the Part and on the document label at the top of the Model tree.

Properties

  • DataId: ID (Part number) of the item. This field is optional.
  • DataLicense: the license under which the part is released.
  • DataLicense URL: the Web address where the terms license can be found.
  • DataPlacement: specifies the orientation and position of the Part in the 3D space. See Placement.
  • DataLabel: the Label is the name given to the operation. This name can be changed at your convenience.
  • DataGroup: lists the referenced objects.

Limitations

  • Even when a Part is active, newly created objects are not placed inside the Part, but at the bottom of the tree. Simply drag and drop them over the Part.
  • A Part has no shape. It is therefore not possible to apply most 3D operations on a Part, such as Part Booleans.
  • At this time, Draft Snaps do not work on selected Part containers or on objects inside a Part container.
  • Redactor's note: at this time, it is unclear whether the Part's active status serves a purpose.

Inheritance

A Std Part is formally an instance of the class App::Part, whose parent is the basic App GeoFeature (App::GeoFeature class).

Simplified diagram of the relationships between the core objects in the program. The App::Part class is a simple group that has a position in 3D space, and controls the placement of other objects it contains.

Scripting

Following command adds new group to the active document: 

App.ActiveDocument.addObject("App::Part", "Part")
Std Base
PartDesign
User documentation
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