12 March 2014Manufacturing / Production Technology, Hardware & Services
Physik Instrumente’s (PI) new H-820 Hexapod is a positioning system with linear repeatability of 20 &mu.m, and 200 &mu.rad in the tip/tilt or rotational axes. It provides travel ranges of up to 100 mm (x and y) and 50 mm in the z axis, as well as rotational angles up to 60°. A load capacity of 20 kg and velocities up to 20 mm/s can be achieved.
The H-820 Hexapod is a compromise between PI’s high-end six-axis systems and the need for cost efficiency. It includes a powerful digital controller commanded via Ethernet and all target positions are given in Cartesian coordinates. Its price and performance make the system particularly appealing for applications in industrial automation and manufacturing, or for research, e.g. in biotechnology.
The Hexapod is driven by six high-resolution actuators, all connected directly to the same moving platform. This parallel-kinematic structure combines high system stiffness with a large clear aperture.
Because of the low mass of the moving platform, positioning operations can be performed with far lower settling times than with stacked multi-axis systems. In those systems, run-out and guiding errors, which have an impact on the dynamic properties of the individual axes, as well as friction and inertia of moving cables, all accumulate to limit the system’s accuracy and repeatability – problems which do not affect parallel-kinematic systems like the Hexapod.
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