Cobotic Loading of High Accuracy CMM Calibrator

Metrology specialist Perschmann Calibration GmbH, part of the Hoffman Group, has automated the calibration of ring and plug gauges using a KUKA robot LBR iiwa cobot to automatically load and unload a High Accuracy Leitz moving table Coordinate Measuring Machine (CMM).

“The precision with which we at Perschmann Calibration calibrate measuring instruments is approx. 0.5 µm, explains Dr. Detlef Rübesame, Head of Technology at Perschmann Calibration GmbH. The company’s customer base consists primarily of customers from conventional mechanical engineering, automotive industry and the aerospace sector. Customers use the measuring instruments for quality assurance in their production processes.

“In collaboration with KUKA, Hexagon Manufacturing Intelligence introduced us to a concept for the automation of our calibration process and, as a result, to an even more customer-friendly option for the quick calibration of many different measuring instruments. We adopted the idea right away,” recalls Detlef Rübesame.

The fully automatic inspection system is equipped with a KUKA flexFELLOW solution and the Leitz CMM from Hexagon. The cobot able to sensitively pick up various measuring instruments from a material storage mechanism and feed these to the Hexagon coordinate measuring machine for calibration. It can recognize the gauge and perform the automated calibration.

In the first work step of the automated measuring process, the cobot removes the gauge from the storage unit and moves it under a scanner before having air blown to remove dust and prevent incorrect measurement. After identified the gauge is clamped and the associated measurement program is loaded and automated calibration commenced.Once the measuring process is completed, the robot grips the gauge again and places it into a second storage unit. The certificate of successful calibration is created automatically.

The automated measuring process has brought many advantages for Perschmann with the time required for each gauge being reduced. The system is able to run fully automated on a second shift.

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