1st Quarter 2014Electrical switching & drive systems & components
Physik Instrumente has released the H-820 Hexapod with linear repeatability of 20 μm, and 200 μrad in the tip/tilt or rotational axes. Furthermore, the H-820 provides travel ranges of up to 100 mm (X and Y axes) and 50 mm in the Z axis, as well as rotational angles up to 60°. A load capacity of 20 kg and velocities of up to 20 mm/s can be achieved.
The H-820 Hexapod is not as precise as the well-proven high-end six axis systems; but with the performance characteristics of all its components perfectly tuned and selected for cost efficiency it can be offered at a favourable price. The system also includes a powerful digital controller commanded via Ethernet. All target positions are conveniently given in Cartesian coordinates. The price and performance make the H-820 particularly appealing for applications in industrial automation and manufacturing.
Why parallel kinematics?
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, that 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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