PI News / Press Releases Overview
Latest Products
Date: 05/2006
PI News: M850K102 Ultra-High Load Six-Axis Positioning Precision Hexapod Stewart Platform for Astronomy Applications, 6-Axis Hexapod Positioner; electrical linear actuator hexapod

M-850K102 Ultra-High Load Hexapod

PI has designed a unique Hexapod (Stewart Platform) high-load 6-axis positioner for astronomy applications and other alignment tasks. The M-850K102 custom Hexapod combines extremely high precision with a load capacity of up to 1000 kg. It provides minimum incremental motion to 0.8 µm and 1 µrad, respectively. The six individual actuators have a design resolution of 0.08 µm and a stiffness of 40 N/µm.

  • Six Degrees of Freedom
  • Works in Any Orientation
  • No Moving Cables for Improved Reliability and Precision
  • 1000 kg Load Capacity (Vertical)
  • Heavy-Duty, Ultra-High-Resolution Bearings for 24/7 Applications
  • Repeatability to 0.5 µm
  • Actuator Resolution 0.008 µm
  • Significantly Smaller and Stiffer Package than Conventional Multi-Axis Positioners
  • Vacuum-Compatible Versions
  • Linear and Rotary Multi-Axis Scans
  • Virtualized Center of Rotation (Pivot Point)
  • Sophisticated Controller Using Vector Algorithms
M-850K102, 1000 kg Hexapod shown with M-840 Hexalight.

Hexapod Working Principle and Advantages
The M-850 Stewart Platform Hexapod is driven by six high-resolution actuators all connected directly to the same moving platform. The principle is similar to that seen in flight simulators, but considerably more precise. In place of the hydraulic actuators used there, the M-850 uses custom high-load precision screws and servo-motors. It can withstand loads of 1000 kg vertically, and at least 180 kg in any direction.

Technical Specifications:

Number of Axes:


Linear travel range XYZ:

24 mm

Rotation range:

8 deg. (rot z) 6 deg. (rot x, y)

Actuator design resolution:

< 0.08 µm

Minimum incremental motion XYZ:

0.8 µm

Minimum incremental motion Rot xyz:

1 µrad

Repeatability X, Y:

1 µm

Repeatability Z:

0.5 µm

Max Linear Velocity XYZ:

0.5 mm/s

Max Rotary Velocity:

6 mrad/s

Actuator Stiffness:

40 N / µm

Load capacity:

up to 1000 kg (depends on orientation)


450 kg

Typical Applications
Alignment and tracking of optics, electron beams; fine positioning of active secondary mirror platforms in astronomical telescopes

>> M-840 Hexapod in Motion Video

>> Hexapod Selection Guide
>> NEXLINE Piezo Hexapod (Non Magnetic)
>> M-824 Compact Vacuum Hexapod
>> M-850, 100 kg Hexaod
>> F-206, HexAlign Flexure Hexaod
>> More About Hexapods


>> Free 500 p. Hardbound Catalog

Return to News Overview


PI is a leading manufacturer of nanopositioning, linear actuatorsand precision motion-control equipment for photonics, nanotechnology, semiconductor and life science applications .
PI has been developing and manufacturing standard & custom precision products with piezoelectric and electromagnetic drives for 40 years.
The company has been ISO 9001 certified since 1994 and provides innovative, high-quality solutions for OEM and research.
PI is present worldwide with eight subsidiaries and total staff of 500+.