Purpose – Aims to research the possibilities of using piezoelectric technology to improve accuracy and other characteristics of parallel servo grippers.Design/methodology/approach – The paper presents in detail two different kinds of developed two‐fingered servo grippers based on piezoelectric technology with parallel moving mechanics. The first gripper is based on standing wave ultrasonic motors. The other gripper is a traditional gripper, the characteristics of which have been improved with integrated piezoelectric stack actuators. Both servo grippers have been tested and the test results and experiences are introduced in the paper.Findings – It is possible to improve the accuracy and characteristics of a parallel servo gripper with piezoelectric technology.Research limitations/implications – In the future it is necessary to concentrate on the mechanical design of gripper bodies and the fingers. Grasping force feedback signal should be even more linear and noiseless.Practical implications – Piezoelectri...
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