Quick Answer
CMM qualification at Prism includes: (1) probe/stylus qualification using NABL-calibrated reference sphere, (2) performance verification using NABL-calibrated gauge blocks per ISO 10360-2, and (3) issuance of NABL certificates for probe qualification and volumetric measurement capability. Full volumetric CMM calibration (ISO 10360-2) is performed by CMM OEM service teams using certified standards from Prism.
Key Takeaways
- CMM probe qualification uses NABL-calibrated reference sphere (qualification sphere).
- Performance verification per ISO 10360-2 using calibrated gauge blocks and step gauges.
- IATF 16949 Clause 7.1.5.3 requires CMM gauge R&R and annual performance verification.
- Prism provides NABL-calibrated gauge blocks (Grade 00, Grade 0) for CMM performance verification.
- Full volumetric CMM error mapping (ISO 10360-2) done by CMM OEM teams; Prism provides reference standards.
CMM Probe Qualification — What Prism Provides
CMM probe qualification (stylus and probe tip calibration) uses a NABL-calibrated reference sphere (typically 25 mm diameter ruby or ceramic sphere) to determine the actual probe tip radius and centre offset. Prism's reference sphere is NABL-calibrated with certified diameter (traceable to SI) and roundness. Using Prism's certified reference sphere in your CMM's probe qualification routine gives you NABL-traceable probe qualification.
Gauge Blocks for CMM Performance Verification
ISO 10360-2 performance verification of a CMM requires calibrated length artefacts: gauge blocks (25 mm, 50 mm, 100 mm, 150 mm, 200 mm), step gauges, and ball plates. Prism provides NABL-calibrated gauge block sets (Grade 00 and Grade 0) that your CMM service team or in-house metrologist can use for CMM performance verification, with full NABL-traceable documentation.
CMM Calibration Requirements for IATF 16949
IATF 16949 MSA Requirement
IATF 16949 Clause 7.1.5.3 requires statistical studies (MSA/Gauge R&R) on all gauging referenced in the control plan. For CMMs, this means: annual performance verification per ISO 10360-2, probe qualification documented with traceable references, and uncertainty budgets for each measurement application. Prism provides NABL-certified reference artefacts for CMM qualification.
Frequently Asked Questions
Can Prism perform full volumetric CMM calibration per ISO 10360-2?
Prism provides the NABL-calibrated reference artefacts (gauge blocks, step gauges, reference sphere) needed for ISO 10360-2 CMM performance verification. The actual CMM test is performed by CMM OEM service teams or accredited CMM metrology specialists using these reference standards.
Does Prism calibrate CMM styli (stylus tips)?
Individual stylus tips (ruby spheres) are not typically calibrated — they are replaced when worn. Prism provides the NABL-calibrated reference sphere used in CMM probe qualification to characterise stylus assemblies.
What grade of gauge blocks should I use for CMM verification?
Grade 00 gauge blocks (highest precision, uncertainty < 0.05 µm per ISO 3650) are recommended for CMM performance verification in the highest-accuracy applications. Grade 0 (uncertainty < 0.1 µm) is sufficient for most production CMMs.
How often should CMMs be performance-verified?
Annual performance verification per ISO 10360-2 is standard. CMMs in temperature-varying environments or subject to vibration (shop-floor CMMs) should be verified every 6 months.
Is NABL CMM calibration required for IATF 16949 compliance?
IATF 16949 requires traceable calibration of all measurement devices. For CMMs, this means performance verification using NABL-calibrated reference artefacts. The CMM's measuring capability must be documented with uncertainty values for each application.
Written by
Er. Parthiv Kinariwala
Managing Director · Prism Calibration Centre · NABL CC-2480 · Ahmedabad
Er. Parthiv Kinariwala founded Prism Calibration Centre in 2004 and has over 20 years of hands-on experience in calibration engineering, NABL accreditation, and industrial compliance. His team performs 10,000+ calibrations annually from the Vatva GIDC laboratory, serving 5000+ industries across Gujarat.
Prism Calibration Centre — Vatva GIDC, Ahmedabad
Prism Calibration Centre
F-101, Rudraksh Complex 2, Phase 3, GIDC Vatva, Near Jasoda Nagar Cross Road, Ahmedabad — 382445, Gujarat, India
Phone: +91 98245 26444
Email: info@prismcalibration.com
NABL: CC-2480 · ISO/IEC 17025:2017
Hours: Mon–Sat, 9:00 AM – 7:00 PM