CMM (Coordinate Measuring Machine) Inspection & AS9102 FAI Reports
A CMM is a 3D metrology system utilizing high-precision touch-trigger, scanning, or optical sensor probes to measure geometrical characteristics with sub-micron volumetric precision.
Engineering Specifications & Parameters
Probe Types
Touch-Trigger, Continuous Scanning, Laser Optical
Quality Reports
Full AS9102 FAI, Dimensional Inspection, GD&T True Position
Volumetric Accuracy
E0,MPE = 0.9 + L/350 microns
Inspection Standards
ISO 10360-2 Metrology Verification
Standard Lab Environment
20.0 C +/- 0.5 C (Class 10,000 Cleanroom)
CMM Metrology Fundamentals
Coordinate Measuring Machines (CMMs) measure spatial XYZ coordinates on machined parts, comparing physical geometries against 3D CAD nominal models.
Probe Technologies
Touch-Trigger Probes (e.g. Renishaw TP20): Fast discrete point capture for bores, planes, and distances.
Continuous Contact Scanning (e.g. SP25M): Traverses surfaces taking thousands of points per second to evaluate roundness, cylindricity, and profile of surface.
Optical Laser Scanning: Non-contact capture of complex organic freeform 3D contours.
Environment & Temperature Stabilization
CMM calibration is certified at standard 20.0 degrees C (68 degrees F). Parts must temperature-soak in the quality lab before certified First Article Inspection (FAI) reporting.
Frequently Asked Questions
Why must machined aluminum parts stabilize in the CMM room before measurement?
Aluminum expands 23 microns per meter for every 1 degree C increase. Measuring a warm part off the machine can cause a 0.02mm false out-of-tolerance error.
What is the role of CAD-based CMM programming (PC-DMIS)?
Offline software imports 3D CAD step files, automates collision-free probe paths, and auto-populates GD&T tolerance pass/fail reports.
