CMM — Coordinate Measuring Machine
A coordinate measuring machine determines the coordinates of points on a workpiece so software can evaluate dimensions, geometry and relationships against a defined measurement plan.
How CMM — Coordinate Measuring Machine works
- A bridge, gantry, arm or other structure moves a probe relative to the part.
- Touch-trigger, scanning, optical and multi-sensor systems collect different kinds of measurement data.
- Software aligns the measured part, constructs features and reports results against tolerances.
- Environment, fixturing, calibration, probe qualification and operator method affect uncertainty and repeatability.
What to compare
| Volume | Usable measuring envelope after probe, fixture and access requirements. |
|---|---|
| Sensor | Touch, scanning, optical or multi-sensor capability for the feature set. |
| Performance | Manufacturer accuracy specification, probing performance and applicable conditions. |
| Software | Supported geometry, CAD workflow, reporting, licenses and program compatibility. |
| Environment | Temperature range, vibration control, air requirements and foundation needs. |
Used-equipment inspection checklist
Verify the machine
- Confirm model, controller, probe system and software-license transferability.
- Review calibration and service records.
- Run a repeatability study using a stable artifact.
- Inspect air bearings, scales, cables and crash protection.
- Define relocation, recommissioning and calibration cost before purchase.
Verify the transaction
- Match the serial number and configuration to the seller's description.
- Identify every included and excluded accessory in writing.
- Confirm power, air, coolant, foundation, rigging and relocation requirements.
- Record a time-stamped operating demonstration and measured result.
- Price missing service, software, tooling and recommissioning before comparing offers.
Why this term matters in the used-machine market
Search results and listings often compress a complete production system into one label. Buyers should translate that label into capacity, condition, control generation, included tooling, serviceability and demonstrated output. Sellers improve credibility by disclosing those facts instead of repeating a brochure headline.
Market value is also specific to timing and buyer fit. A capable machine can trade poorly when its configuration is hard to relocate, support or redeploy; a common platform with documented maintenance, current controls and proven output may attract a wider buyer pool.
Related machine-tool terms
Frequently asked questions
Is a CMM result automatically traceable?
No. Traceability depends on the measurement process, calibrated standards, documented uncertainty and an unbroken calibration chain.
Can one probe measure every feature?
No. Access, surface, feature size, tolerance and speed can require different styli or sensor technologies.
Sources and further reading
Source roles are explicit: linked organizations describe their own products, programs or technical guidance. The Machine Blue Book independently organizes and interprets that material for education and used-equipment due diligence. A citation is not an endorsement, sponsorship or guarantee.
- Renishaw — Coordinate Measuring Machines. Metrology-system context for CMM probing, sensing and measurement workflows. Reviewed September 26, 2026.
- IMTS — IMTS Technology Sectors. Primary classification of metal removal, quality, automation, software, tooling and workholding sectors. Reviewed September 26, 2026.
See the complete source register, research methodology and editorial standards.