Coordinate Measuring Machines

• Production Engineering, Semester 1, position 5

The objective of the course is acquire of knowledge and skills in the field of coordinate metrology and flexible metrological automation for solving metrological problems in production engineering. Students should acquire and to master new knowledge and skills about: basic terms in production metrology, development and application of coordinate measuring machine (CMM) in engineering practice; subsystems of CMM; accuracy and methods of accuracy testing; measuring and inspecting all types of tolerances through the definition of the measurement protocol, the configuration and calibration of measuring sensors; methods of automatic inspection planning and simulation of inspection and measurement.

After successfully completion of this course, the students should be capable to: recognize the structure and characteristics of the CMM subsystem with their functions; determine the CMM coordinate systems and define the inspection and measurement plan; determine the sequence of metrological tasks with the configuration of the measurement sensor and perform the analysis from the geometric-metrological aspect; determine the CMM error budget and perform its analysis; take tolerances from the CAD geometric model, simulate measurement and output from the simulation used in the CMM programming system (geometric-metrological identification); analyze the report on the results of measurement and inspection; make CMM selection for the conditions of use (group of metrology tasks) in the production organization.

Theoretical teaching embraces ten units: 1. Introduction to measuring machines. Basic characteristics. Development and application of CMM. Presentation of measuring machines of the latest-fifth generation. 2. Hardware structure of CMM. 3. Software for general and special purpose, its characteristic and applications. 4. Programming CMM. Off / on - line programming. 5. Accuracy and accuracy testing of CMM. Standards for accuracy testing of CMM. 6. Automatic inspection planning on CMM. Metrological model of part and metrological features. 7. Optimization of the planned measuring path. 8. Configuring measuring probes and analyzing the setup of measuring parts. 9. Measurement and inspection planning . Measuring protocol. 10. Simulation of measurement and generation of a control data list.

Practical teaching embraces ten units: seven auditory and three laboratory exercises, as well as seminar work. The content of the auditory exercises is as follows: 1. Measurement and inspection. Determination of the coordinate measurement system. 2. Definition of geometric and metrological features. 3. Distribution of measuring points by metrological features depending on the type of tolerance. 4. The principle of the collision avoidance. 5. Generating the initial path of the measurement sensor during inspection of prismatic parts on CMM. 6. Generating the optimal path of the measuring sensor on the base an ants colony optimization technique. 7. Analysis of setup of measuring parts and measuring bases. Laboratory exercises are realized by factory visit and work in the PTC-Creo (CMM-module) software for modeling and simulation, as a followed: 1. Visit to the factory that owns CMM and get familiar about its work and technical characteristics. 2. Modeling and simulation of measurements in the software system PTC Creo - CMM module. 3. Inspection planning in PTC Creo - CMM module for a concrete measuring part. Generating CL files of a measuring sensor.

Defined by curriculum of study programme.

1. Stojadinovic, S. (2022), Coordinate measuring machine, handouts for each lecture. 2. Тhе instruction for doing laboratory exercises, tasks and seminar work. 3. The monograph in the field of quality and production metrology. 4. The web site of the course. 5. Facility and technical equipment: Laboratory for production metrology and TQM.

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 14
Laboratory exercises: 9
Calculation tasks: 3
Seminar paper: 4
Project: 0
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 1
Review and grading of lab reports: 1
Review and grading of seminar papers: 2
Review and grading of the project: 0
Test: 4
Test: 2
Final exam: 5

Activity during lectures: 10
Test/test: 30
Laboratory practice: 0
Calculation tasks: 20
Seminar paper: 10
Project: 0
Final exam: 30
Requirement for taking the exam (required number of points): 30

Stojadinovic, M.S., Majstorovic, D. V. (2019), An Intelligent Inspection Planning System for Prismatic Parts on CMMs, Springer International Publishing, 978-3-030-12806-7.; Majstorovic, V., Hodolic, J. (1998), Coordinate Measuring Machine, FTN Novi Sad /in Serbian/; Sladek, A. J. (2016), Coordinate Metrology - Accuracy of Systems and Measurements, Springer Verlag Berlin Heidelberg; Smith, G. T. (2013). Industrial metrology: surfaces and roundness. Springer Science & Business Media.; Durakbasa, M.N. (2004). Geometrical product specification and verification for the analytical description of technical and non-technical structures, TU Wienna, Austria.