Part Module/zh

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Part workbench icon

Introduction

The solid modelling capabilities of FreeCAD are based on the OpenCASCADE Technology (OCCT) kernel, a professional-grade CAD system that features advanced 3D geometry creation and manipulation. The Workbench Part.svg Part Workbench is a layer sitting on top of the OCCT libraries, that gives the user access to OCCT geometric primitives and functions. Essentially all 2D and 3D drawing functions in every workbench (Workbench Draft.svg Draft, Workbench Sketcher.svg Sketcher, Workbench PartDesign.svg PartDesign, etc.), are based on these functions exposed by the Part Workbench. Therefore, the Part Workbench is considered the core component of the modelling capabilities of FreeCAD.

The objects created with the Part Workbench are relatively simple; they are intended to be used with boolean operations (unions and cuts) in order to build more complex shapes. This modeling paradigm is known as the constructive solid geometry (CSG) workflow, and it was the traditional methodology used in early CAD systems. On the other hand, the PartDesign Workbench provides a more modern workflow to constructing shapes: it uses a parametrically defined sketch, that is extruded to form a basic solid body, which is then modified by parametric transformations (feature editing), until the final object is obtained.

Part objects are more complex than mesh objects created with the Mesh Workbench, as they permit more advanced operations like coherent boolean operations, modifications history, and parametric behaviour.

Part Workbench relationships.svg

The Part Workbench is the basic layer that exposes the OCCT drawing functions to all workbenches in FreeCAD.


Tools

The tools are all located in the Part menu.

Primitives

These are tools for creating primitive objects.

  • Part Box.svg Box: Draws a box by specifying its dimensions
  • Part Cylinder.svg Cylinder: Draws a cylinder by specifying its dimensions
  • Part Sphere.svg Sphere: Draws a sphere by specifying its dimensions
  • Part Cone.svg Cone: Draws a cone by specifying its dimensions
  • Part Torus.svg Torus: Draws a torus (ring) by specifying its dimensions
  • Part Primitives.svg Primitives: A tool to add any of the defined geometric primitives.
  • Part Shapebuilder.svg Shapebuilder: A tool to create more complex shapes from various parametric geometric primitives

Modifying objects

These are tools for modifying existing objects. They will allow you to choose which object to modify.

  • Part Extrude.svg Extrude: Extrudes planar faces of an object
  • Part Revolve.svg Revolve: Creates a solid by revolving another object (not solid) around an axis
  • Part Mirror.svg Mirror: Mirrors the selected object on a given mirror plane
  • Part Fillet.svg Fillet: Fillets (rounds) edges of an object
  • Part Chamfer.svg Chamfer: Chamfers edges of an object
  • Part RuledSurface.svg Ruled Surface:
  • Part Loft.svg Loft: Lofts from one profile to another
  • Part Sweep.svg Sweep: Sweeps one or more profiles along a path
  • Part Thickness.svg Thickness: Hollows out a solid, leaving openings next to select faces.
  • Part Booleans.svg Boolean: Performs boolean operations on objects
  • Part Fuse.svg Union: Fuses (unions) two objects
  • Part Common.svg Common: Extracts the common (intersection) part of two objects
  • Part Cut.svg Cut: Cuts (subtracts) one object from another

Measure

Std Measure Menu.png Measure: Allows linear and angular measurement between points, edges, and faces.

Other tools

Context menu items

  • Appearance: determines appearance of the whole part (color transparency etc.).
  • Set colors: assigns colors to part faces.

Preferences

  • Preferences-part design.svg Preferences: preferences available for Part Tools (the Part workbench also uses the PartDesign Preferences).
  • Preferences-import-export.svg Import Export Preferences: preferences available for importing from and exporting to different file formats.
  • Fine-tuning: some extra parameters to fine-tune Part behavior.

Scripting

See Part scripting.

Tutorials