±0.002 mm precision. GD&T compliant. Zeiss CMM.
CMM (Coordinate Measuring Machine) inspection services. Zeiss precision CMM for ±0.002 mm dimensional verification. Full GD&T evaluation, surface profile, position tolerance, runout, concentricity. Reports in customer format.
CMM inspection services
CMM measures part features in 3D space with high precision. Different feature types require different measurement strategies.
What CMM measures.
Linear dimensions
Standard linear dimensions verified with CMM probe touch points. Multiple points for repeatability.
Hole diameter / position
Hole diameter via best-fit circle from probe points. Position vs datum reference frame per GD&T spec.
Surface flatness
Probe many points across surface, fit plane, measure deviations. Specifies max valley-to-peak deviation.
Parallelism
Compare two surfaces — must remain within parallel tolerance over full length.
Perpendicularity
Surface perpendicular to datum within tolerance. Common for mating faces.
Position tolerance
Position of feature center relative to datum reference. With or without MMC modifier.
Concentricity / runout
Axes coaxial, or surface runout within tolerance. Critical for rotating components.
Profile tolerance
Compare actual surface to nominal CAD surface. Used for blade profiles, complex curves.
Compound angles
Angular relationships between features at any 3D orientation. Common for aerospace mounting features.
CMM measures part features in 3D space with high precision. Different feature types require different measurement strategies.
CMM measurement process.
Drawing review
Identify all features for measurement, GD&T datum scheme
CMM programming
Create part-specific CMM program (1-3 hours typical for complex parts)
Calibration verification
CMM calibration verified per metrology procedure
Datum establishment
Probe datum features per drawing GD&T
Feature measurement
Probe each feature with appropriate strategy
Statistical analysis
Compute dimensions, evaluate vs tolerance
Report generation
Customer format report with measurements vs tolerance
Documentation archive
Records retained per industry retention requirement
Customer review
Customer review and signoff for FAI; ongoing for production
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±0 — questions
What CMM equipment do you use?
Zeiss precision CMM with PH10 motorized probe. Measurement volume 700×900×500 mm typical, larger machines available for special cases. Probe stylus 1-5 mm tip diameter, multiple stylus configurations for accessing different features. Touch trigger probe + scanning probe (continuous contact) for surface profile work.
CMM accuracy specs?
Standard production CMM: MPE_E volumetric performance ±0.002 mm typical. Repeatability on simple feature ±0.0015 mm. For sub-micron precision (rare requirement): partner labs with environmental controls. CMM calibration: annual, traceable to NIST through accredited calibration provider. Calibration certificate available on request.
How does CMM handle GD&T?
CMM software (Calypso, PC-DMIS) directly evaluates GD&T per ASME Y14.5. Datum reference frame established by probing datum features. Position tolerance, profile tolerance, runout, concentricity all computed automatically. MMC modifier supported. Report format includes nominal, tolerance, actual, deviation for each feature.
Programming complex parts?
Complex parts require detailed CMM program: feature identification, datum probing strategy, measurement sequence optimization, collision avoidance. First-time program 2-5 hours for complex aerospace parts. Once programmed, subsequent measurements fast. We retain programs for repeat production work.
CMM service for customer-supplied parts?
Yes — we offer CMM inspection services on parts manufactured elsewhere. Customer ships parts to us, we inspect to drawing, return parts with inspection report. Useful for: third-party verification, audit support, dimensional check before assembly. Quote per inspection complexity.
Cost of CMM inspection?
First-article inspection (1 piece, complex): $200-1000 depending on feature count and complexity. Production inspection (recurring, simple): $5-50 per part once programmed. Sample inspection (every 10th part during production): $10-30 per inspected part. Programming overhead amortized over production run.
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