Used Coordinate Measuring Machines for Sale 200

Coordinate measuring machines serve as the primary dimensional verification equipment in manufacturing quality control, measuring part features against design specifications with accuracy typically measured in single-digit micrometres. The CMM provides objective dimensional data that manual measurement methods — micrometers, calipers, height gauges — cannot match for complex part geometries with multiple interrelated features.

Bridge CMMs dominate production quality control. The bridge structure — carrying the probe assembly — travels over a granite surface plate on air bearings, providing smooth, friction-free motion that enables precise positioning. Measuring volumes range from compact 500x400x300mm for small parts through standard 1000x1500x800mm for general production inspection to large 2000x3000x1500mm for automotive and aerospace components.

Probe technology significantly affects inspection capability and speed. Touch-trigger probes contact the workpiece at discrete points — each touch records one coordinate. Scanning probes maintain continuous contact while traversing the surface, generating thousands of measurement points per second for faster and more complete surface characterisation. Multi-sensor CMMs combine touch probing with optical sensors for non-contact measurement of delicate or soft features.

Measurement software capability determines CMM productivity. Modern metrology software imports CAD models directly, enabling part programs to be created from 3D models rather than from engineering drawings. Offline programming creates inspection programs before the part reaches the CMM, maximising machine utilisation. Automated report generation produces inspection documentation without manual data transcription.

Environmental conditions directly affect CMM accuracy. Temperature stability (typically ±1°C around 20°C), vibration isolation from factory floor disturbances, and cleanliness to prevent contamination of air bearings all contribute to achieving rated accuracy specifications. CMMs installed in environments not meeting manufacturer specifications will not deliver rated accuracy.

Temperature compensation systems on modern CMMs correct for workpiece and machine thermal expansion when ambient temperature deviates from the 20°C reference. However, temperature compensation provides correction, not equivalence — machines in temperature-controlled environments will always outperform compensated machines in unstable environments.

Browse used coordinate measuring machines on Exapro to compare bridge, gantry, and articulated arm CMM configurations from leading manufacturers worldwide.

When evaluating used CMMs on Exapro, verify measurement accuracy using calibrated reference standards traceable to national measurement institutes, check air bearing condition and function, test probe system accuracy and repeatability, confirm software version and CAD file format compatibility, verify that the CMM's measuring volume and accuracy specification match your inspection requirements, and assess the installation environment for temperature stability and vibration isolation.