Onat Ekinci Avatar

Onat Ekinci

Research Consultant

Onat Ekinci works as a research consultant and engineer. He worked as a research consultant in areas such as surgical robots, aerospace and power utilities. He has a PhD in mechanical engineering from Montreal Polytechnic and has publications in the field of machine design and error analysis.

education

Ecole Polytechnique de Montreal  
PhD, Mechanical engineering, Jan, 2005 to Jan, 2009
Subject: Modelling of machine tool errors according to causality principle. Some of the projects I worked on during my PhD: 1. Design of machine tool error diagnostic software in Bombardier Aerospace Company. 2. Structural design and construction of a 3 axis machine tool. 3. Design and construction of an axis of a coordinate measuring machine.

Ecole Polytechnique de Montreal  
MSc, Mechanical engineering, Jan, 2002 to Jan, 2004
Subject: Analysis of thermal, elastic and geometric effects on the kinematic errors of a CMM (coordinate measuring machine) guide way.

projects

Idea Generation Workshops for Bombardier Aerospace (2010-2011)  by  Onat Ekinci    

Aim of the project: Organization of innovation workshops with the creative personnel with the goal of producing patentable ideas in strategic fields.

Strategic Technology Analysis for HydroQuebec (2009-2010)  by  Onat Ekinci    

Aim of the project: To carry out patent portfolio strength analysis of Hydro-Quebec patents in an advanced technological field, backed-up by business intelligence (market assessment and technology assessment, including subfields). Project Stages: • Competitive landscape analysis. • Detailed assessment of portfolio strength of HQ and competitors, for all subfields. • Concrete propositions for patent royalty policy, and IP strategy. • Proposal of new strategic business opportunities (incl. overseas areas).

Conceptual design and feasibility study of a medical robot in Jewish General Hospital (2008-2009)  by  Onat Ekinci    

Aim of the project: The construction of a robotic medical instrument to assist surgeons during minimally invasive surgery. Project Stages: • Extensive patent study and academic literature review. • Participation to surgery operations. • Brainstorming sessions with medical personnel. • Contact with groups around the world for research collaboration. • Contact with companies for financial support.

Design of machine tool error diagnostic software in Bombardier Aerospace Company (2007-2009):  by  Onat Ekinci    

Aim of the project: Detection of the error sources on a parallel robot machining head structure of a 5 axis machine tool (brand: Ecospeed-Dorries Scharmann, Germany) for preventive maintenance. Project stages: • Kinematic modelling and simulation of the machining head with parallel robot structure. • Determination of possible error sources on the machining head. • Development of error diagnostic method based on telescopic ball bar, determination of specific error traces corresponding to error sources. • Development of software with graphical user interface to interpret the data files obtained through ball bar.

Structural design and construction of a 3 axis machine tool (2005-2009)  by  Onat Ekinci    

Aim of the project: The construction of a 3 axis machine tool structure as an experimental bench to analyze the effects of machine error sources. Project stages: • Examination of machine tool models on the market and selection of an optimal candidate. • Modelling of 3D drawings and technical drawings on CATIA V5. • Rigidity and modal analyses of structures on the ANSYS platform. • Concrete structure design in collaboration with civil engineering department. • Mechanical component design (ball screw, linear guides, motors, etc.). • Contact with distributors and manufacturers of components for information and price submission. • Budget preparation according to selected components. • Communication with technicians (of civil and mechanical engineering departments) for the manufacturing and assembly of components.

Design and construction of an axis of a coordinate measuring machine (2004-2006)  by  Onat Ekinci    

Aim of the project: To analyze the kinematic machine axis behaviour and its relationship with the guide way geometric errors Project stages: • The construction and assembly of an axis built from commercial CMM mechanical components. • The measurement of axis errors with laser interferometry.

publications

Investigation of accuracy of aerostatic guideways     
Published by (International Journal of Machine Tools and Manufacture)
Authors: Onat Ekinci, J.R.R. Mayer, Guy M. Cloutier.  Published January 21, 2009

Aerostatic guideways are often used in machines requiring very high motion accuracy such as coordinate measuring machines. Currently, positioning error analysis for such machines focuses on the relationship between volumetric errors on one hand and axes’ motion errors and axes’ relative location errors on the other. The internal mechanisms causing motion errors are rarely considered. In order to gain a deeper understanding of aerostatic guideways, this paper investigates the relationship between the motion errors of the axis’ carriage and the guideways’ geometric errors both mathematically and experimentally. The analytical model uses bearings location and stiffness, guideway geometry and static equilibrium to produce a model in matrix form. Validation experiments are conducted on a machine axis moving on aerostatic guideways with and without preload.

Relationships between straightness and angular kinematic errors in machines     
Published by (International Journal of Machine Tools and Manufacture)
Authors: Onat Ekinci, J.R.R. Mayer.  Published October 01, 2007

The software compensation approach for the improvement of machine tool and coordinate measuring machine accuracy depend to some extent on machine error modelling and measurement methodologies. The currently established methodology is based on the derivation of tool position error (for machine tools) or stylus tip position error (for coordinate measuring machines) by the combination of individual axis joint kinematic error parameters. The purpose of this paper is to propose a machine error analysis based on error classification. This taxonomic approach forms a conceptual basis for an analysis of machine errors with a deeper understanding of error mechanisms at more fundamental levels. The relevance of this approach is investigated through the case study of the coupling mechanism between joint kinematic angular and straightness errors of machine linear axes. The limitations of the joint kinematic straightness and angular error modelling based on purely abstract mathematical dependence principles are explored through simulations and experiments.

Modélisation des erreurs machines selon le principe de causalité     
Published by (Editions Universitaires Europeennes)
Authors: Onat Ekinci.  Published May 25, 2010

La modélisation des erreurs de machine est un outil indispensable dans l'amélioration de la productivité des machines et par conséquent de la compétitivité des entreprises. Ce travail concerne la connaissance des sources physiques des erreurs de machine, offrant une analyse plus approfondie de la précision des machines, visant à augmenter la robustesse de modélisation. Dans cette étude une classification hiérarchique des erreurs machines est développée afin de créer une base conceptuelle pour une analyse plus avancée. Cette classification est basée sur le principe de causalité et offre une compréhension plus approfondie des mécanismes d'erreurs. Les relations causales entre plusieurs catégories d'erreurs machines sont examinées sur des bancs d'essai spécialement conçus et analysées à travers les principes du cadre théorique.