Air Bearing / Linear Guide System

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.

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.