Hexapod & Parallel Kinematic Positioning Systems

Compact, stiff, multi-axis positioning platforms for coordinated motion in X, Y, Z, pitch, yaw, and roll. PI hexapod and SpaceFAB systems combine mechanics, controller, and software into an integrated 6-axis positioning solution.

Explore Current PI Hexapods View Systems

Why Parallel Kinematics?

Unlike stacked multi-axis stages built from individual single-axis positioners, a parallel-kinematic system is designed from the outset as one coordinated multi-axis mechanism. This architecture can provide a smaller package, greater stiffness, faster response, shorter settling, improved multi-axis repeatability, and freedom from accumulated runout errors.

Six coordinated axes

Linear and rotational motion are controlled as one integrated positioning system.

High stiffness

Parallel load paths support precise positioning and dynamic performance.

Compact architecture

Six degrees of freedom without stacking six separate motion stages.

Shorter settling

High structural rigidity can support faster response and dynamic operation.

No stacked-axis error buildup

Parallel motion avoids the cumulative runout associated with serial stage stacks.

Vacuum options

Many PI parallel positioners are available in high-vacuum-compatible configurations.

Hexapod vs. Stacked Multi-Axis Stages

The two approaches can both provide multi-axis motion, but their mechanical architectures differ fundamentally.

Design Aspect	Parallel-Kinematic Hexapod	Stacked / Serial Stages
Axis arrangement	Multiple actuators act on one common platform	Individual stages are mounted one on another
System height	Compact 6-DOF architecture	Height grows as axes are added
Mechanical stiffness	High stiffness from parallel load paths	Depends on each stage and stack configuration
Error accumulation	No serial accumulation of individual-stage runout	Errors can accumulate through the axis stack
Cable management	No moving cables between stacked stages	Cabling may move with upper stages
Controller	Dedicated multi-axis controller and software	Often coordinated from individual axis controls

Applications for 6-Axis Precision Positioning

Precision hexapods and parallel positioners are used wherever an object must be aligned or moved accurately in multiple linear and rotational degrees of freedom.

Optics Alignment

Astronomy

Fiber Positioning

Aerospace Research & Manufacturing

Precision & Laser Machining

Medical Engineering & Treatment

Two Parallel-Kinematic Architectures

Classical Hexapods

Stewart-Gough-type hexapods use six variable-length legs acting on a common platform. This arrangement can provide a particularly compact footprint while supporting motion in all six degrees of freedom.

SpaceFAB Positioners

SpaceFAB systems use three XY positioners acting on a common platform through three constant-length struts. The architecture is readily customized and can provide longer XY travel with a lower profile than typical Stewart-platform designs.

Learn more about how parallel-kinematic 6-DOF hexapod robots differ from traditional articulated 6-axis robots.

Hexapod Positioning Systems

Legacy PI miCos systems shown below are retained from the original product page for reference. For current models and specifications, use the PI hexapod product link above.