What Is a CMM?

A CMM collects points in X–Y–Z with a probe and reconstructs geometric features (diameters, planes, cylinders, cones, profiles). The goal is to verify drawing dimensions, tolerances, and form/position tolerances such as true position, flatness, and cylindricity.

Probe Technologies

• Touch-trigger: Takes a point upon contact; versatile and cost-effective.
• Scanning: Streams data along the surface; ideal for profiles and freeforms.
• Optical/laser: Fast point clouds on complex surfaces; consider reflectivity effects.

Measurement Process

1. Planning: Review drawing; define critical characteristics and GD&T items.
2. Part prep: Cleaning, fixturing, and thermal stabilization.
3. Alignment: Establish coordinate system via reference features (3-2-1).
4. Probing/scanning: Select proper strategy; collect points and sections.
5. Evaluation: Compare results to tolerances; analyze deviations.
6. Reporting: Ballooned drawing, tables, and SPC summaries.

GD&T Applications

Position (⌀TP), concentricity, parallelism, perpendicularity, flatness, cylindricity, and profile tolerances are reliably validated with CMM. Datums (A–B–C) must be well defined; the measurement strategy should follow this reference frame.

Accuracy, Repeatability & Uncertainty

Overall performance depends on machine specs, probe calibration, operator technique, and environment. Repeatability (same conditions) and reproducibility (across operators/conditions) are key metrics for quality assurance.

Calibration & MSA (GR&R)

• Calibration: Periodic verification with traceable artifacts (gauge blocks, spheres).
• MSA/GR&R: Quantifies the share of measurement system variation; required for process acceptance.
• Environment: Control temperature, vibration, and dust in the CMM room.

Reporting & Data Output

Standard reports include measurement tables, pass/fail tolerance status, deviation maps, and ballooned drawings. Upon request we provide CSV, PDF, DXF, and 3D point-cloud exports.

Cost Drivers

• Geometry complexity and point count
• Probe strategy (scanning vs touch)
• Ballooning & report scope
• Expedite requests and re-measurements

For a fast quote, share your drawing with highlighted critical dimensions via our contact page.

FAQ

Which file formats do you accept?

STEP/IGES (3D) and PDF/DWG/DXF (2D) preferred. Ballooned drawings speed up planning.

What’s included in your reports?

Dimension tables, tolerance results, deviation plots, optional point clouds, and SPC summaries.

Do you offer quick FAI for prototypes?

Yes. We provide fast First Article Inspection and concise reports.