[Hiroe]

I understand Robot ballbar testing option is to measure/check the accuracy or performance of robots. But is it possible to adapt it to improve them? 
If it is possible, please explain how to do it in a rough and simple way.

[Albert]

It is currently not possible to calibrate a robot with a ballbar. On the other hand, you can use the ballbar to check the performance of a robot.

More information about robot ballbar testing here:
https://robodk.com/doc/en/Robot-Validati...-Test.html

[Hiroe]

Thank you for your clarification.
The only way to improve robot accuracy is to use tracker calibration among the features offered by RoboDK. Is my understanding correct?

[Jeremy]

As for now, you are correct.