The Standards and Calibration Laboratory (SCL) has developed a verification service for Coordinate Measuring Machine (CMM) on linear dimensions measurement in accordance with ISO 10360-2:2009. This service was peer reviewed by Dr Tan Siew-leng of National Metrology Centre, Singapore and accredited by the Hong Kong Accreditation Service (HKAS) in April 2018.

CMM is a precision dimension measuring equipment which can measure in 3-dimension volume. CMMs are used in manufacturing industry that requires very tight tolerance, such as aircraft service and tooling. The setup and control of CMMs are very complex, requiring the use of proprietary control programmes. It is the industry practice to verify CMMs by the equipment manufacturers. The drawback of this practice is that biased verification conclusions may be drawn and CMMs may be accepted based on sub-standard verification tests.

As an independent third party, the SCL provides the accredited verification service to ensure CMMs are verified in accordance with the international standards ISO 10360-2:2009 “Acceptance and Reverification Tests for CMM – Part 2: CMMs used for Measuring Linear Dimensions”. The standard defines tests and performance indicators for CMM verification including probing error, size error, length measurement error, repeatability range and length measurement error with ram axis offset.