ENHANCED ROBOT CALIBRATION IMPROVES PROGRAMMED PATH PERFORMANCE

July 31, 2019

Cole Technologies, Inc, located in Columbus, Indiana, are a certified Universal Robots system integrator supplying automation systems specializing in pick and place, deburring, and plastic part trimming applications. One recent project involved the deflashing of molded parts where a more accurate robot path was deemed necessary.

Cole Technologies contracted API Services to perform on-site robot calibration using the API RADIAN 6DoF (6 degrees of freedom) laser tracker, in conjunction with its proprietary Robot Measuring Software (RMS), to improve programmed robot motion path accuracy.

The RMS system uses a multiple SMR tracker target frame directly mounted onto the robot end-effector allowing for dynamic robot tracking. Recorded measurements are used to determine tracked robot position points revealing true robot position and orientation. RMS procedures use ISO 9283 guidelines to check accuracy, repeatability, pose, distance, drift, and overshoot by exercising all robot joints. Robot working envelope can be defined applicable to the planned robot application function.

“The availability of additional robot accuracy allows us to provide a better outcome for the customer regardless of application” states Steve Richard Director of Engineering at Cole Technologies. “API were able to directly interface with our RoboDK robot programming software for robot calibration making it seamless and efficient to load the new parameters.”

Measuring a free point cloud consisting of 80 points the RMS software generated a new DH (Denavit-Hartenberg) frame model parameter set that was used to correct errors in joint angles and link lengths. The revised DH parameter can be directly input into the robot controller or used to update the robot motion path program as was the case at Cole Technologies resulting in significant improvements to robot accuracy.

Find out more HERE.

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