Precision and Accuracy Analysis: Cobot vs. Human Operator

This study investigates the precision and accuracy of a collaborative robot (cobot) compared to a human operator in a pick and place operation. Through a controlled experiment involving 120 measurements for each operator, the authors analyzed performance using statistical methods including control charts, process capability analysis, and deviation measurements. The experimental design required both operators to place a one-inch cube on a specific target location, with deviations measured in the x and y directions. Results demonstrate that the cobot significantly outperformed the human operator in both precision and accuracy. Control chart analysis showed the cobot maintained statistical control in eight of nine measurements, while the human operator achieved control in only three. Although neither operator met process capability requirements (Cp and Cpk values of 1.0), the cobot’s values were substantially closer. Deviation analysis revealed that the cobot placed the cube within the 0.1 mm specification limits 99.2% of the time, while the human operator succeeded in only 16.7% of trials. This research provides evidence that cobots represent a viable alternative to human operators for tasks requiring high precision and accuracy in manufacturing and service industries, with implications for sectors including pharmaceutical dispensing and electronics manufacturing.