Multi-Carriage Air-Bearing IGM


Design Features

  • Custom-engineered designs with linear motion components integrated directly into a granite structure
  • Granite air bearing surfaces offer precise, repeatable motion over the entire travel length
  • Multi-carriage design increases machine throughput efficiently with minimal additional overhead
  • Design is scalable based on application requirements for travel length, payload, and dynamic performance
This multi-carriage, linear air-bearing IGM system provides exceptional geometric performance and throughput and is ideal for testing, optical metrology, and laser processing applications. It can be used in horizontal (as shown), inverted, or upright orientations. The granite base and Invar carriages offer excellent stiffness, thermal stability, and design flexibility.                                    

Because they are specifically engineered to meet a customer’s application requirements, IGM motion systems represent the pinnacle of design flexibility. From drive and bearing type selection to system layout and arrangement, IGM systems are available with a wide variety of value-adding accessories and state-of-the-art control electronics. Aerotech’s motion engineers regularly custom-tailor IGM systems to meet unique technical and commercial application requirements.

The integrated nature of an IGM system lends itself to offer certain unique technical benefits. The granite structure is able to offer increased stiffness over traditional stages in certain situations, contributing to improved dynamic performance. Further, the simplified structural design serves to reduce the axis profile and minimize design offsets, resulting in a reduction in Abbe errors and therefore more accurate motion at the desired workpoint.

See our case study for a comparison of an IGM system versus a traditional stage-on-granite system.


Aerotech mechanical-bearing IGM systems are designed around the performance and budgetary needs specific to your application. As such, exact performance specifications are unique to each system. See our case study for a comparison of an IGM system versus a traditional stage-on-granite system.

Contact an Aerotech Applications Engineer today to discuss your application requirements.


  • Multi-Carriage Air-Bearing IGM (Sample Dimensions)
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Ordering Information

Multi-Carriage Air-Bearing IGM

Although each IGM system is carefully engineered to a customer’s specific requirements, there are a variety of common options, features, and capabilities to consider. The following list of commonly available options is not exhaustive. Contact an Aerotech Applications Engineer to discuss all of the possibilities for your IGM system.

Motor Type
  • Single linear motor per axis
  • Dual linear motors per axis; for higher-torque applications

Carriage Options
  • Quantity of independently-controlled carriages
  • Carriage material

Direct Linear Feedback
  • Linear encoder with 1 Vpp amplified sine output
  • Linear encoder with digital TTL output
  • Linear encoder with absolute output

Machine Base
  • Steel weldment machine base with open sides and leveling feet
  • Steel weldment machine base with closed sides (doors and/or panels) and leveling feet
  • Provisions for internally-mounted control electronics

  • Passive elastomeric isolation between granite and machine base
  • Passive air isolation between granite and machine base

Additional Performance-Enhancing Options
  • Calibration and metrology
  • Integrated air filtration system