FreeCAD Robot Workbench Purpose and Features
The FreeCAD Robot workbench is a specialized environment within the open-source parametric modeler designed to simulate and analyze the movements of industrial 6-axis serial robots. It allows engineers, designers, and hobbyists to set up robotic workcells, visualize trajectories, verify reachability, and generate robot-specific motion programs directly from their 3D CAD models without needing third-party simulation software.
The primary purpose of the Robot workbench is to provide kinematic simulation for standard articulated robotic arms, such as those manufactured by KUKA. By combining 3D geometry with kinematic definitions, users can study how a robot interacts with parts, tools, and fixtures within its workspace. This verification step helps identify physical limitations, awkward postures, or mechanical interference early in the design cycle of an automated workstation.
Key functionalities of the Robot workbench include:
- Kinematic Modeling: The workbench enables users to define or import 6-axis industrial robots. It handles forward kinematics, allowing individual joints to be driven interactively to explore the machine's range of motion and working envelope.
- Trajectory Creation: Users can build motion paths by selecting CAD geometry—such as edges, curves, or vertices—from existing parts. These features are converted into robot waypoints and continuous trajectories, defining orientation and position for tasks like welding, gluing, cutting, or deburring.
- Simulation and Visualization: Once a trajectory is mapped, the workbench animates the robot following the defined path. Users can monitor joint angles and end-effector positions in real time to ensure smooth, continuous motion throughout the operation.
- Code Export (Post-Processing): Beyond visual simulation, the workbench can translate simulated paths into executable robot language files. It includes post-processors for standard controllers, most notably KUKA Robot Language (KRL), turning CAD-defined motions into production-ready instructions.
In a typical workflow, a user imports a robot model (usually defined via VRML/CSG kinematics), places workpieces and fixtures around it, defines a tool center point (TCP), creates waypoints along a feature of the CAD model, and runs the simulation to ensure the robot can reach all target points. Once validated, the trajectory can be exported for use on the physical robot controller.