Tutorials 

Monday 30th May 2022

euspen’s 2022 extensive tutorial programme will cover a range of key topics for the precision engineer

Whilst covering a clear technical curriculum, tutorials are less formal than a lecture; providing more personalised learning in a social atmosphere.
They incorporate existing challenges in the workplace which cover conceptual theories through to best practice applications.
These tutorials will take place on Monday 30th May 2022.

T2 FUNdaMENTALs of Precision Design
T1 Uncertainty evaluation for precision engineers
T3 X-Ray Computed Tomography Metrology
T4 Analysis and Design Concepts for Ultrastable Mechanical Systems: Thermal Effects

Tutorial 1: Uncertainty Evaluation for Precision Engineers

Monday 30th May 2022
Room: TBC
Time: TBC

The tutor is Prof. Richard Leach, University of Nottingham, UK

The course will arm precision engineers with a basic understanding of the key elements of uncertainty evaluation for measurement applications. It will require a basic knowledge of mathematics (up to the level of differentiation) and will cover the following elements:

Basics of metrology

  • Why measurement is essential
  • A short history of measurement
  • Measurement traceability – fundamental principal, global and legal infrastructure
  • Terminology
  • Error types and calibration
  • The SI infrastructure

The GUM uncertainty framework I

  • Systematic and random errors
  • Single value uncertainty evaluation
    • Mean, standard deviation and standard deviation of the mean
    • Uncertainty distributions and confidence intervals
    • The standard uncertainty concept
  • Propagation of uncertainties
    • Direct calculation
    • Calculation using derivatives
    • Calculation using a Monte-Carlo method

The GUM uncertainty framework II

  • Measurements with multiple variables
  • Propagation of standard uncertainties
  • Uncertainty budgets
  • Confidence intervals
  • Propagation of probability distributions

Richard Leach is currently a Professor in Metrology at the University of Nottingham and prior to this spent 25 years at the National Physical Laboratory. He has been researching and lecturing on surface metrology for over 30 years. He is on the Council of the European Society of Precision Engineering and Nanotechnology (president elect), the Board of the American Society of Precision Engineering and several international standards committees. He is the European Editor-in-Chief for Precision Engineering and has over 560 publications including eight textbooks. He is a Fellow of the Institute of Physics, the Institution of Engineering & Technology, Higher Education Authority, the Institute of Measurement & Control, the International Society of Nanomanufacturing and the International Academy of Production Engineering (CIRP). He is a visiting professor at Loughborough University and the Harbin Institute of Technology.

Tutorial 2: FUNdaMENTALs of Precision Design

Monday 30th May 2022
Room: TBC
Time: TBC

The tutor is Prof. Alex Slocum, MIT, US

This tutorial provides a fast-paced hands-on introduction to rapid precision machine design based on FUNdaMENTAL principles including theory and best practices. Topics include: initial error allocation to enable rapid design, principles of accuracy, repeatability and resolution, bearings, structures, and actuators.  Kinematic and elastic averaging-based designs and the implications for bearing life and dynamic performance are stressed with F=kx and w = sqrt(k/m) as recurring themes throughout the design of a machine.  Examples will be presented to show how FUNdaMENTAL principles are critically important for an engineer to understand in order to be able to most effectively use modern design tools such as solid modelling and finite element analysis in the design of precision machines.

This tutorial should be helpful for those at the beginning of their careers and also for those who wish to tune up their design approach with linking design approaches with first order analysis to develop designs more rapidly and to check output from FEA.

Attendees should expect to leave with new design tools (spreadsheets) they feel comfortable applying and a host of new design ideas for selecting and integrating bearings structures and actuators in precision machines.

Alexander Slocum is the Walter M. May and A. Hazel May Professor of Mechanical Engineering at MIT, a Fellow of ASPE and ASME, and a member of the National Academy of Engineering.   He has 145+ patents and has helped develop 11 products that have received R&D 100 awards for “one of the one hundred best new technical products of the year”.  He pioneered the deterministic design of kinematic couplings (www.kinematic couplings.org) including the standard for all semiconductor wafer transport carriers (SEMI E57-1296).  He has helped start several successful precision manufacturing equipment companies and has a passion for working with industry to solve real problems and identify fundamental research topics.

Tutorial 3: X-Ray Computed Tomography Metrology

Monday 30th May 2022
Room: TBC
Time: TBC

The tutor is Dr Adam Thompson, University of Nottingham, UK

The course will provide a basic understanding of measurement using X-ray computed tomography, containing an overview of the theory behind how measurement data is acquired and the factors that affect measurements. It is  aimed at novice to intermediate users and should be helpful for graduates, postgraduate engineers/physicists, post-doctoral researchers as well as industry technical staff working in measurement using X-ray computed tomography.

This course will cover the history and principles behind XCT metrology, including discussion of reconstruction methods and artefacts for calibration. Specific case studies of relevance to dimensional measurement using XCT will be provided as well as reviewing a state of the art in XCT measurement. This course will also address some of the issues faced when making XCT measurements and the limitations of the technology, and, finally, cover the specific use of XCT for surface measurement.

Dr Adam Thompson has been a post-doctoral researcher in UoN’s Manufacturing Metrology Team (MMT) since October 2018. Prior to this position, Adam completed his PhD in at the University of Nottingham, entitled “Surface texture measurement of metal additively manufactured parts by X-ray computed tomography”, for which he was awarded the Gertrude Cropper Scholarship. Adam has published 19 papers and a two book chapters, and presented his work at over 25 conferences. Adam’s research background is in surface topography measurement of additively manufactured parts, authoring papers on the measurement of metal and polymer parts. Adam also has expertise across metrology, having undertaken postdoctoral projects in performance verification of fringe projection and X-ray computed tomography measurement. Adam also teaches courses in basic and advanced metrology.

Tutorial 4: Analysis and Design Concepts for Ultrastable Mechanical Systems: Thermal Effects

Monday 30th May 2022
Room: TBC
Time: TBC

The tutor is Nicolas Jobert, Alma Consulting, FR

This tutorial will provide the framework required when designing mechanical systems with high immunity against thermal effects, i.e. temperature drifts and/or thermally induced elastic distortions. It will span basic and advanced concepts, evaluation tools and methods, as well as control strategies and practical limitations. A particular emphasis will be placed on the usage of an integrated approach, allowing to develop compact thermal elastic models sufficient to provide an understanding of the key parameters governing each problem. Such models can not only be used to decide on the severity of individual disturbance sources but are also mandatory when designing practical mitigation solutions, either passive or active.

The approach will be illustrated with applications ranging from simple, academic-like test cases to widespread mechanical components such as flexure-based translation stage, up to more advanced  opto-mechanical systems (wavefront interferometers / high finesse etalon cavities). From these examples, it will be demonstrated that the design of high-performance systems relies on a small set of concepts and rules, which can be effective for fulfilling ordinary or less conventional customers’ requirements.

This is a beginning to intermediate level course, with material ranging from basic to complex, to provide both an overview and references for further study. The intended audience is graduates, postgraduate engineers/physicists, plus industry technical staff having a first experience in systems for which thermal stability aspects are relevant, and aiming at strengthening their insight so as to reduce guesswork for future projects.

Nicolas Jobert studied Mechanical Engineering at the Ecole Centrale Marseille, where he specialized in Noise and Vibrations. After graduating in 1996 he has been active in a range of consulting companies providing services for industry, civil engineering companies and numerous research centers. During these periods, he carried out problem characterization via in the field or in the lab measurement campaigns, as well as the design and numerical simulation/validation of corrective procedures. Nicolas has also worked in a large international group in the design and verification of safety related nuclear power systems.

Between 2012-2020, he worked at the French National Synchrotron Radiation Light Source (SOLEIL), where he is involved in the design, validation and commissioning of accelerators and beamline systems.

As of 2020, he offers consulting services for academia and industry, via his company Alma Consulting.

He also teaches Master 2 classes (Université Paris-Saclay) together with specialized sessions for professionals, with an emphasis on high-precision optomechanical systems.

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