Glossary · Robotics
Continuous-path motion
Also known as: CP motion, Path motion
German: Bahnbewegung
In robotics and CNC, continuous-path motion is a motion type in which the controller guides the tool center point along a defined geometric path, such as a straight line or circular arc, with controlled speed along the path. It contrasts with point-to-point motion, where only the end positions are defined.
- Robotics
In one sentence
Continuous-path motion guides the tool center point along a defined line or arc with controlled path speed, as needed for welding or gluing.
Example
The adhesive bead is applied with continuous-path motion at a constant 200 mm/s so the bead width stays uniform around the window frame.
How it applies
- Engineering: Linear and circular motion commands interpolate all axes so that the Tool center point (TCP) follows the programmed geometry. Paths close to a Singularity can require very high joint speeds, which the controller limits or rejects.
- Commissioning: Path accuracy depends on correct tool data, payload and calibration. Blending (approximation) at path corners trades accuracy for cycle time.
- Documentation: The documentation team should name motion types as the controller does (for example linear, circular, joint) and explain in programming guides when each is used, including the effect of speed overrides on process quality.
Continuous-path motion vs. point-to-point motion
In continuous-path motion the path between two positions is defined; in Point-to-point motion only the target is defined, and the path results from the axes moving individually. Process tasks need continuous-path motion; free transfers use point-to-point motion for speed.