The ballbar test is often used to test the performance of computerized numerical control (CNC) machines. This test can also be performed on robots to check their performance and degradation. This test shows the error, repeatability, and backlash of a circular path.

The most common ballbar device for performance purposes is the Renishaw QC20-W. This ballbar works wirelessly with a CR2 (3V) battery and requires a computer with Bluetooth connection.

Robot Validation Ballbar Test - Image 1

Note: Since May 2023, RoboDK also supports the Renishaw RCS L-90, a ballbar measurement system designed specifically for robots. This device has a wide travel range (up to 90 mm) and comes with different mounting mechanisms to mount the ballbar on existing TCP (such as weld guns).

Robot Validation Ballbar Test - Image 2

The following image shows the ballbar test performed using a medium sized robot.

Robot Validation Ballbar Test - Image 3

RoboDK software guides you through each step to successfully accomplish a ballbar test. RoboDK can prepare the robot program in the 3D simulation environment, record ballbar measurements, and generate a performance report specific to your robot.

Video: The following video shows a quick overview of the ballbar test for robots to check their performance: https://www.youtube.com/watch?list=PLjiA6TvRACQc5E_3c5f3TFXEa56XNR1-m&v=uz6Cm-v2bww

Note: More information available here: https://robodk.com/ballbar-test.

Introduction