FAQ
Frequently Asked Questions
Procurement and quality questions, answered the way a supplier questionnaire asks them.
Common Questions
If a question below is not covered, it can be answered directly — see the contact page.
How often should a CMM be calibrated?
Most shops verify annually, though usage rate, crash history and customer requirements can shorten the interval. The basis for the interval should be documented, not assumed from habit.
What is the difference between calibration and verification?
Calibration establishes the relationship between readings and reference values with a stated uncertainty. Performance verification checks whether the machine still meets its specification. Most shop work is verification, run under ISO 10360-2 or ASME B89.4.1.
What does ISO 10360-2 actually test?
Length measurement error is checked at five calibrated lengths, three repeats each, in seven positions across the volume - 105 measurements total, compared against the machine's stated maximum permissible error.
Can verification be done on-site, and how long is the machine down?
On-site verification is available and avoids shipping the machine out. Time on site depends on machine size and whether adjustment or repair is needed; this is confirmed at quotation.
What temperature does the room need to be?
ISO 1 sets 20°C as the dimensional reference temperature. Most CMM enclosures specify 20°C with a stated excursion and gradient limit; the machine manufacturer's environment applies for acceptance testing.
What happens if the machine fails as-found testing?
As-found results are recorded before any adjustment is made. From there, a reverse-traceability impact assessment can be run back to the last passing calibration, identifying parts that may need review.
How do I check that a certificate is accredited for my instrument?
The laboratory's published scope of accreditation lists specific measurements and ranges, searchable in the accreditation body's public directory. Checking the item against that scope confirms what the certificate actually covers.
What is a CMC and why does it matter to my tolerances?
Calibration and measurement capability is the smallest uncertainty a laboratory can claim for a given measurement. It should be small enough, relative to your tolerance, to support the customary 4:1 test uncertainty ratio.
Will this satisfy an IATF or AS9100 auditor?
Auditors under IATF 16949 and AS9100 look for accredited certificates, stated uncertainty, and evidence that out-of-tolerance findings trigger an impact assessment. Certificates are prepared with those clauses in mind.
What is an error map, and can it be updated on my controller?
The controller applies an error map, a volumetric compensation table, to correct known geometric errors. Whether it can be updated depends on the controller; some OEM controllers lock the map to factory service.
Further Detail
Standards, traceability and equipment control are set out on the quality system page. Competence and authorization are covered on the our team page. Commercial terms are in the terms and conditions.
Question about a specific item?
Send the detail and it is answered against the method that would actually be used.