[sig.johnnson]

I am currently evaluating a Fanuc CRX-series cobot for an industrial application where accuracy is important. In the past, 10x accuracy improvement has been a good estimate for RoboDK's calibration tool. This application is for a non-contact process.
1. Can you confirm that 10x accuracy improvement is still a good estimate for calibration of a fairly floppy cobot like a Fanuc CRX-20iA/L?
2. Do you happen to have any data for the baseline (uncalibrated) accuracy of any robots in the Fanuc CRX series? (Fanuc does not publish that data and we do not want to buy one to find out.) If not, do you happen to have that data for any halfway-similar robots?

[Albert]

You should be able to calibrate Fanuc CRX robots the same way you can calibrate any other 6-axis robot arm with RoboDK. This is an improvement we did about a year ago. In previous versions there were some parameters that were not accounted for with Fanuc CRX robots.

The best accuracy you may achieve with a robot is around 4-6 times the repeatability. For example, if the repeatability of the Fanuc CRX-20iA/L is 0.040 mm, I would expect the average position accuracy for this robot to be 0.200 mm or worse.

Also, for your information, the repeatability you can find on the specifications of robot arms is the unidirectional repeatability. In my experience, the real repeatability (multidirectional, if we can call it that way) can be 3-5 times worse.

[sig.johnnson]

Thanks for the insight, Albert! Extremely helpful.

[Albert]

Thank you for your feedback!