Editorial Technical Reference

Air Bearing / Linear Guide System

This page explains how Air Bearing / Linear Guide System is classified within Machinery and Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

A precision motion system that uses compressed air to create a frictionless bearing surface and linear guides to enable ultra-smooth, high-accuracy movement in coordinate measuring machines.

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Product Specifications

Technical details and manufacturing context for Air Bearing / Linear Guide System

Definition
The Air Bearing / Linear Guide System is a critical component of Coordinate Measuring Machines (CMMs) that provides the ultra-precise, frictionless linear motion required for accurate dimensional metrology. It combines air bearings, which levitate moving parts on a thin film of compressed air to eliminate mechanical friction and wear, with precision linear guides that constrain motion to a single axis. This system directly enables the CMM's probe to move smoothly and repeatably along the X, Y, and Z axes, forming the foundation for the machine's measurement accuracy and long-term reliability by minimizing hysteresis, stick-slip, and thermal effects associated with traditional contact bearings. The system is designed for applications demanding high precision and repeatability, such as in metrology laboratories and manufacturing quality control. It operates on clean, dry compressed air, typically at pressures between 0.4 and 0.6 MPa, and requires air quality conforming to ISO 8573-1 Class 3.4.3. The air film thickness is typically 5-20 microns, providing near-frictionless movement with high stiffness and damping. The system's performance is characterized by parameters such as load capacity (50-500 kg per carriage), travel length (100-2000 mm), straightness accuracy (±0.5 to ±2 µm/m), and positioning repeatability (±0.1 to ±0.5 µm). Materials used include granite, ceramic, stainless steel, and aluminum alloy, with guide rails made of hardened steel (60 HRC) and bearings of aluminum alloy with porous graphite. The system is available with ingress protection ratings from IP54 to IP65. For any specific application, it is essential to verify model-specific values and standards with the legal manufacturer or supplier, as the listed parameters are reference ranges that must be confirmed.
Working Principle
Compressed air is supplied to the air bearing pads, creating a thin film (typically 5-20 microns) that lifts and separates the moving carriage from the guideway, eliminating metal-to-metal contact. The linear guide (often a precision rail or way) provides geometric constraint to ensure straight-line motion. The combination allows for near-frictionless movement with high stiffness and damping characteristics. The air film is maintained by a continuous supply of clean, dry air, and the system's performance depends on air pressure, air quality, and the precision of the guide surfaces.
Common Materials
Granite, Ceramic, Stainless Steel, Aluminum Alloy
Technical Parameters
ParameterTypical rangeNotes & selection driver
Load Capacity50–500 kgDynamic load rating per carriage
Travel Length100–2000 mmCustomizable per application
Straightness Accuracy±0.5–±2 µm/mOver full travel lengthISO 230-2
Positioning Repeatability±0.1–±0.5 µmBidirectionalISO 230-2
Operating Pressure0.4–0.6 MPaClean dry air requiredISO 8573-1
Air Consumption10–50 L/minPer bearing at rated pressure
Maximum Speed0.5–2 m/sLimited by air film stiffness
Operating Temperature10–40 °CBelow 10°C risk of condensation
Air Quality ClassISO 8573-1 Class 3.4.3Particle, water, oil limitsISO 8573-1
Guide Rail MaterialHardened steel 60 HRCGround and lapped surfaceDIN 17230
Bearing MaterialAluminum alloy / porous graphitePorous graphite for even air distribution
Weight5–50 kgPer meter of travel
Ingress ProtectionIP54–IP65Higher IP for harsh environmentsIEC 60529

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Air Bearing Pad
    Generates and maintains the air film that levitates the moving carriage. Contains precise orifices or porous media to distribute air evenly.
    Material: Porous Carbon, Bronze, or Ceramic
  • Guide Rail / Way Part
    Provides the precision reference surface for linear motion. Must have extremely high flatness and straightness.
    Material: Granite, Stainless Steel, or Ceramic-coated Steel
  • Moving Carriage / Saddle
    The platform that moves along the guideway, supporting the CMM's bridge, ram, or probe head. Incorporates the air bearing pads.
    Material: Aluminum Alloy or Cast Iron
  • Air Supply Manifold
    Distributes filtered, regulated compressed air from the main supply to individual bearing pads.
    Material: Aluminum or Stainless Steel
  • Preload Mechanism
    Applies a controlled force to maintain optimal air gap and system stiffness, often using vacuum preload or mechanical springs.
    Material: Stainless Steel
  • Compressed Air
    The clean dry air supply that forms the 5-20 micron film lifting the carriage.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Air Bearing / Linear Guide System.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Industrial Ecosystem & Supply Chain Structure

Complementary Systems
Downstream Applications
Specialized Tooling

Application Fit & Sizing Matrix

Operational Limits
pressure: 40-100 psi (2.8-6.9 bar) supply pressure, 0.5-5 psi (0.03-0.34 bar) bearing pressure
flow rate: 2-20 SCFM per bearing (depending on size and gap)
temperature: 15°C to 35°C (typical operating range, may vary by material)
load capacity: Up to 200 N per bearing (varies with size and pressure)
flatness requirement: ≤5 μm/m surface flatness for optimal performance
Media Compatibility
✓ Clean, dry compressed air (ISO 8573-1:2010 Class 1.4.1 or better) ✓ Inert gases (nitrogen, argon) for specialized applications ✓ Non-conductive, non-abrasive cleanroom environments
Unsuitable: Wet, oily, or particulate-laden air (causes clogging and instability)
Sizing Data Required
  • Maximum load per bearing (N)
  • Required travel length and accuracy (mm, ±μm)
  • Available air supply pressure and flow capacity (psi, SCFM)

Reliability & Engineering Risk Analysis

Failure Mode & Root Cause
Air film collapse
Cause: Contamination ingress (dust, oil, particles) blocking air supply orifices, or insufficient air pressure/flow due to compressor failure or leaks in the supply system.
Surface scoring/wear
Cause: Abrasive particles embedded in the bearing surface or guide rail, often from inadequate filtration of intake air or poor environmental cleanliness, leading to direct metal-to-metal contact during operation or startup/shutdown.
Maintenance Indicators
  • Audible scraping or grinding noise during movement, indicating loss of air film or particle interference.
  • Visible uneven motion or 'sticking' of the carriage, often accompanied by increased vibration, suggesting air supply issues or surface damage.
Engineering Tips
  • Implement multi-stage filtration (e.g., coalescing and particulate filters) on the air supply with regular replacement schedules, and maintain ISO 14644-1 Class 8 or cleaner environment to prevent contamination.
  • Use automatic lubrication systems with clean, dry air-compatible lubricants on guide rails if specified, and perform regular alignment checks with laser tools to prevent uneven wear from misalignment.

Indicative industry ranges for design and RFQ preparation. Confirm the exact figures and applicable standard with the manufacturer before specifying.

Compliance & Manufacturing Standards

Applicable Standards
ISO 10791-7:2020 (Geometric accuracy of linear motion axes) ANSI B5.54-2005 (Specifications for machine tool spindles and bearings) DIN 5480-1:2006 (Splined connections with involute splines based on reference diameters)

Quoted from the published standard.

Manufacturing Precision
  • Flatness of mounting surface: ≤0.005 mm/100 mm
  • Parallelism between guide rails: ≤0.01 mm/1000 mm
Quality Inspection
  • Air film thickness uniformity test (using capacitance probes)
  • Running accuracy test (straightness and positioning repeatability measurement)

Manufacturers of Air Bearing / Linear Guide System

Manufacturer profiles associated with Air Bearing / Linear Guide System.

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Frequently Asked Questions

What is the typical air film thickness in an air bearing system?

The air film thickness is typically 5-20 microns, which separates the moving carriage from the guideway, eliminating metal-to-metal contact.

What air quality is required for the air bearing system?

The system requires clean, dry air conforming to ISO 8573-1 Class 3.4.3, which specifies limits for particles, water, and oil.

What is the load capacity range for this system?

The dynamic load rating per carriage ranges from 50 to 500 kg, depending on the specific model and configuration.

How does the system achieve high positioning repeatability?

The system achieves positioning repeatability of ±0.1 to ±0.5 µm by using air bearings to eliminate friction and precision linear guides to constrain motion, minimizing hysteresis and stick-slip.

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
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