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Project

Test Procedures for Performance Verification of CMMs with Tactile and Optical Probes: Study of ISO Standards and Development of Complementary Tests

Within quality control for industrial applications, many types of measuring instruments are utilised. When it comes to checking dimensional requirements, such as geometrical product specifications, one of the most frequently used measuring instruments are coordinate measuring machines (CMMs). Through the use of a CMM, a workpiece can be inspected to prove it conforms to its intended design. The topic of this dissertation takes one step back and scrutinises whether the measuring instrument that is being used for this inspection is meeting its specifications. The set of tests thus verifies whether the CMM as a measuring instrument conforms to its specified performance.

 

To accomplish the task of CMM performance verification, various tests are designed, of which multiple are standardised within the international organisation of standardisation (ISO). The ISO 10360 standards deal with CMM performance verification in several documents that each pertain to a specific type of CMM probing system. The probing system classes under investigation are tactile touch-trigger probing systems, tactile scanning probing systems and laser line scanner (LLS) probing systems. The main verification tasks envisioned in this dissertation, which are also present in each standardisation document, are the single orientation probe performance, the linear dimension performance, the multiple orientation probe performance and, where relevant, the probe specific performance verification tests.

Within this dissertation, the primary focus is the ISO standardisation documents of ISO 10360 with respect to the probing system types, yet also non-standardised performance verification tests are scrutinised. As a last component, the differences between the tactile and the non-contact probing systems are elaborated on.

 

This thesis describes three contributions to the field of performance verification as embedded in the ISO standardisation.

- The development of the ISO standards, both novel and revised ISO standards are discussed in detail.

- The current state of the art with respect to ISO CMM performance verification is described and applied to the aforementioned CMM probing system classes.

- The state of the art is critically judged, and suggestions are brought forward to further improve the performance verification tests.

 

This dissertation further enlightens three more practical aspects which are closely linked to performance verification testing of CMM probing systems.

- The optimisation of non-standardised and standardised performance tests are envisioned with a primary focus on the time efficiency for executing these tests.

- A comparison of two inherently different probing principles for measuring cavities is drafted, more specifically for bore holes.

- The determination and compensation of the so-called roughness offset between contact and non-contact measurements is investigated for rougher manufactured samples with a focus on turned samples.

 

By elaborately examining these topics, this work gains insight in the discussed probing systems. In turn, this more in-depth knowledge contributes to developing better tools, such as verification tests, to investigate and quantify the performance of a CMM probing system.

Date:7 Feb 2011 →  18 Aug 2020
Keywords:Dimensional measurement, CMM, Metrology, Laser Line Scanning, Performance Verification
Disciplines:Manufacturing process planning, Manufacturing processes, methods and technologies, Dimensional metrology
Project type:PhD project