Hexapod Precision Positioning Systems Provide Motion in 6 Degrees of Freedom

Hexapod positioning systems (Stewart- Gough platforms) for precision micro-positioning applications became first commercially available in the 1990. Today’s electromechanical and piezoelectric hexapods are now mainstream and provide many advantages over to serial PuppetShow: The Face Of Humanity Collector's Edition kinematics electromechanical and hydraulic parallel positioning positioning systems.

Hexapod positioners are used as surgical robots and for single mode fiber alignment applications. They are key components for all modern astronomical telescopes.

A hexapod, is mostly designed as a six-legged parallel mechanism structure with 6 actuators between two platforms. The precision actuators move in parallel (parallel kinematics). Computer controlled motion of all actuators enables motion in any degree of freedom (3 linear directions – x, y, z (lateral, longitudinal and vertical), and the three rotation directions (pitch, roll and yaw).

There are fixed strut length and variable strut length hexapod designs available.

Fiixed-strut-length designs can use 6 linear motors to move the basis of each PuppetShow: The Face Of Humanity Collector's Edition joint up and down, or move PuppetShow: The Face Of Humanity Collector's Edition in plane.

Parallel kinematic positioners have many advantages over serial kinematics stacks of stages. Examples are low inertia, higher dynamics, large central aperture, higher stiffness/mass ratio, smaller footprint etc .

Physik Instrumente has more than two decades of experience with design and manufacture of high precision electro-mechanical Hexapods. Commercial products are available in many variations for load capacity from 2 kg to more than 1000 kg. They are the most advanced multiaxis precision positioning systems in the world, providing significantly higher precision Metastock Part 3: (RSC) The Key Success Tool In Trading By Stock Market Sectors than hydraulic hexapods.

Benefits of Hexapods vs Stacked Traditional Precision Positioners

Parallel-kinematic mechanism (PKM) motion control systems have a number of Popular Plants You Can Profit From advantages over standard serial kinematic (stacked) positioning Secured Personal Loans For Your Financial Needs systems.

Higher Stiffness

In a hexapod, all actuators act directly on the same moving platform, with the same dynamic characteristics for the six axes. Because each actuator basically only has one Teleseminars - A way to Boost Your Teleseminar Sales degree of freedom, (unlike a serial stack of stages, where imperfections bearings in each axis contribute to crosstalk and runout), accumulation of off-axis errors is much less of a concern for hexapod designs. Due to the high stiffness flexing and bending errors are not an issue.

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Because of the lower moving mass positioning can be performed with PuppetShow: The Face Of Humanity Collector's Edition faster settling times than with conventional, stacked stage systems.

No Moving Cables

In such systems, runout, guiding errors, and the friction and inertia of moving cables all accumulate to limit accuracy and repeatability—problems which do not affect parallel kinematic systems like the Hexapod.

Fixed Virtual Pivot Point

For optics and other alignment tasks, it is important to be able to define a fixed pivot point. The more sophisticated Hexapod vector controller allows choosing any point in space as the pivot point for the rotation axes by software command. The pivot point remains fixed relative to the platform.

No Cumulative Errors – In serial stacked precision positioning systems, the bottom stage supports its own moving platform plus all stages above it and wobble PuppetShow: The Face Of Humanity Collector's Edition and guiding errors of each axis accumulate. With a hexapod all actuators work parallel and their bearings are constricted to one degree of freedom.

PI piezo Hexapod (Stewart-Gough) platform positioners and electro-mechanical Hexapod positioners have many advantages over hydraulic hexapods. They are smaller, offer much higher precision and How to Watch Zee TV Serials Online From Anywhere most are self locking. Read More http://www.hexapods.net