Definition of Accuracy

Definition of Accuracy

Accuracy is the ability of a robot to move the end-of-arm tool to reach a specific position and configuration as accurately as possible. It is a measure of the error between the value of the point the robot is programmed to reach and the value of the point the robot actually reaches. It depends on the technology of the robot and the accuracy of the control sequence defined for the movement of each joint.

Path accuracy is a measure of how accurately the robot can follow a line between two points. Path accuracy is required for a process such as laser cutting where the robot moves between points.

Repeatability , also known as precision in the robotics world, is a measure of a robot's ability to consistently reach a given point and return to the same programmed position over and over again. Its ability to repeat the same task is an indicator that determines satisfactory customer results.

Repeatability and accuracy are related.

Importance of Accuracy

Robot Accuracy and Repeatability 

In industrial automation, the effectiveness of a robot is measured by its accuracy and repeatability. It is very important that the same task can be performed continuously during the production process with the same level of accuracy, and this is the goal to be achieved.

Determine how successful a robotic application will be.

One of the first features to look for in a robotic shop, especially in welding and material removal. 

Ensures that parts are produced accurately and with predictable results, even after changes are made to the process.

A key enabling technology in robotic surgery.

Must always be present in the automation system, as they are part of the improvement of the elements, including the software and hardware of any system, that allow automation to be successful.

In aerospace manufacturing, the most important, game-changing process is carbon fiber lay-up. In this process, carbon fiber is combined with a resin or epoxy material to create a lightweight and strong composite material that reduces the weight of aircraft to achieve better fuel economy without sacrificing strength or durability.

High robotic accuracy is important in this process because the relative position of the carbon fiber strands is critical to the structural integrity of the part. 

Major Factors to Influence Accuracy      

Robot repeatability is achieved when the major components of an industrial robot work together. These components include the controller, motors, gears, and axes.

The robot's joint reducer plays the largest role in determining the robot's accuracy.

Five major factors

The geometry of the robot

Gearing, such as backlash, hysteresis, or friction

Limited stiffness due to joint elasticity and bearing errors

Servo errors

Vibration

Higher order errors

Others like encoder

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