Answer: Repeatability, Accuracy, Path Accuracy.
Answer analysis: The moving accuracy of the robot tool tip is described by Repeatability, Accuracy, and Path Accuracy.
The moving accuracy of the robot tool tip is usually described by multiple accuracy indicators, which comprehensively reflect the accuracy and stability of the robot when performing tasks. Here are several key indicators:
1. Repeatability:
- Repeatability is the accuracy of the robot end effector (such as the tool tip) moving in the joint space according to the instruction. It measures the consistency of the actual position reached by the end effector when the robot executes the same instruction multiple times.
- In practical applications, repeatability is manifested as the degree of closeness between the actual posture of the robot after reaching the same instruction target point multiple times and the posture specified in the instruction.
- High repeatability is essential for tasks that require high-precision repeated positioning (such as assembly, welding, etc.).
2. Absolute accuracy:
- Absolute accuracy is the ability of the robot to move to a specific instruction point in the work unit, which describes the degree to which the manipulator is close to the specified point when it moves to the specified point.
- Absolute accuracy is caused by system errors, including errors in the robot's structural design, transmission system, control system, etc.
- Absolute accuracy is very important for tasks that require the robot to accurately reach the specified position (such as handling, gluing, etc.).
3. Path Accuracy:
- Path accuracy is the degree of proximity between the center trajectory of the robot and the theoretical path when the robot moves along the path.
- In continuous path control, path accuracy reflects the accuracy of the robot's movement along the predetermined trajectory.
- High path accuracy is of great significance for tasks that require precise control of the robot's motion trajectory (such as cutting, grinding, etc.).
In summary, the movement accuracy of the robot tool tip can be described by multiple indicators such as repeatability, absolute accuracy and path accuracy.
These indicators together constitute the evaluation system of robot accuracy, which provides an important basis for evaluating the performance of robots in different application scenarios.
It should be noted that robots of different brands and models may have different accuracy indicators and performance, so when selecting a robot, it is necessary to make comprehensive considerations based on specific task requirements.