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Dissertations / Theses on the topic 'Geometric accuracy of the machine'

Author: Grafiati

Published: 28 June 2021

Last updated: 29 July 2025

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1

Cross, P. M. "An analysis of the geometric instability of steady supported grinding." Thesis, University of Bristol, 1988. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.384445.

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2

Fletcher, Simon. "Computer aided system for intelligent implementation of machine tool error reduction methodologies." Thesis, University of Huddersfield, 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.368312.

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3

Suchomel, Kamil. "Vlivy výrobních technologií na geometrickou a rozměrovou přesnost obrobků." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319263.

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The aim of the diploma thesis is to describe influences of selected production technologies on geometrical and dimensional accuracy of workpieces. Specific technologies - turning, milling and grinding and the machines on which these technologies will be implemented - a vertical lathe, a portal milling machine and a center grinder are described in this thesis. Additionally a procedure is created for adding geometric errors to a tri-axial machine tool to describe the entire working area of the machine in terms of errors. Subsequently an analysis of each geometric error is created for each machin

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4

Vala, Michal. "Testování technologie on-the-fly přístrojem LaserTRACER." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2017. http://www.nusl.cz/ntk/nusl-319262.

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This diploma thesis describes realization and testing on-the-fly measurement using tracking interferometer. This measurement enables to achieve higher amount of measured points and decrease time of machine tool calibration. Calibration and verification values of machine parameters, as well as time of measurement and other details of this method are compared with results of conventional method called trigger. To evaluate the quality of volumetric compensation created from calibration values, we use verification measurement of circular interpolation.

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5

Velič, Samuel. "Měření obrobků na obráběcích strojích pomocí obrobkové sondy." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2020. http://www.nusl.cz/ntk/nusl-417728.

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This diploma thesis deals with the influence of electronic compensation on accuracy of the measurement using the touch probe. The theoretical part concerns touch probes, specifically their classification, principles of working and applications. This part also includes devices used later in the experiment, particularly double ballbar, laser interferometer and LaserTRACER. The Practical part describes an experiment, demonstrating the correlation between the accuracy improvement of the touch probe and the electronic compensation’s level. All measurements were executed in accordance with the norm

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6

Pokorný, Zdeněk. "Zpracování dat z měření na obráběcích strojích." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-382195.

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The Master’s thesis deals with the precision of machine tools, especially with the three-axis vertical milling machine. It is structurally divided into a theoretical and practical part. While the theoretical part focuses on problems of geometric errors and measuring devices, the practical one is devoted to the machine tool being tested. In this case, the data processing and the proposed statistical analysis are essential, and at the end of the thesis another possible way of developing the data processing is outlined.

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7

Únar, Jan. "Posouzení geometrické přesnosti obráběcího centra pomocí digitálních inklinometrů." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-444307.

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This diploma thesis deals with assessment of geometric accuracy of machining center MCV 754 QUICK. BlueSYSTEM digital inclinometers from WYLER AG, XL-80 laser interferometer from RENISHAW, Ballbar QC20-W from RENISHAW and LaserTRACER self-guiding laser interferometer from ETALON AG were used to measure accuracy. Error of the X straightness in the direction of the Z axis was assessed. The first part of the paper describes the geometric accuracy of the machine, currently available instruments for measuring geometric accuracy and an explanation of straightness. The second part consists of the des

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8

Mišún, Filip. "Návrh automatického cyklu pro posuzování způsobilosti měření obrobkovou sondou na obráběcím centru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443252.

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This diploma thesis describes the procedures of individual electronic compensations for CNC machines used to increase the accuracy of machines. This part is followed by the determining tolerance of the measuring and the influence of individual electronic compensations based on measured data using touch probe and calibrated standards according to VDA 5 norm.

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9

Lintott, Andrew B. "Geometric modelling and accuracy enhancement of parallel manipulators." Thesis, University of Canterbury. Mechanical Engineering, 2000. http://hdl.handle.net/10092/6159.

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The geometric analysis and accuracy enhancement of parallel topology robots is of theoretical interest as well as having potential for application in industrial settings where parallel robots are used for tasks in which positional accuracy is important. This work presents new techniques for modelling of closed loop mechanisms and applies these experimentally in the calibration of a real parallel topology robot: The Delta robot. This work extends the current literature on serial robot calibration into the realm of parallel robots and presents a systematic approach which does not require the mod

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10

Dimitriadis, Alexis. "Assessing the dosimetric and geometric accuracy of stereotactic radiosurgery." Thesis, University of Surrey, 2017. http://epubs.surrey.ac.uk/813888/.

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Stereotactic radiosurgery (SRS) is a non-invasive treatment predominantly used for the management of malignant and benign brain tumours. The treatment can be delivered by various platforms in a single fraction where a high dose of radiation is delivered to the target whilst the surrounding healthy tissue is spared. This requires a high degree of accuracy in terms of the dose level delivered but also in terms of geometric precision. The purpose of this work was to identify the variations of SRS practice in the UK and develop a novel method compatible with all practices, capable of assessing the

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11

Tenn, Stephen Edward. "Characterizing geometric accuracy and precision in image guided gated radiotherapy." Diss., Restricted to subscribing institutions, 2007. http://proquest.umi.com/pqdweb?did=1464128131&sid=1&Fmt=2&clientId=1564&RQT=309&VName=PQD.

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12

Zhang, Li. "Accuracy enhancement of a hexapod machine tool /." Essen : Vulkan-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2864795&prov=M&dok_var=1&dok_ext=htm.

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13

Postlethwaite, Scott R. "Electronic based accuracy enhancement of CNC machine tools." Thesis, University of Huddersfield, 1992. http://eprints.hud.ac.uk/id/eprint/4663/.

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The need for better machine tool accuracy is discussed together with the factors which can affect machine tool accuracy. A study is made of the various techniques adopted for the reduction of errors in machine tools. The concept of error compensation is discussed and the different techniques for error compensation are appraised. A critical appraisal is presented of the work undertaken to date in the field of error compensation. Based on this appraisal a criterion is established for a universally applicable error compensation system. The development of a novel, patented microprocessor based mac

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14

Barcenas, Carolina. "Geometric tolerance verification using superquadrics." Diss., Georgia Institute of Technology, 1997. http://hdl.handle.net/1853/25603.

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15

Djordjevic, Milos. "Evaluation of Geometric Accuracy and Image Quality of an On-Board Imager (OBI)." Thesis, Stockholm University, Medical Radiation Physics (together with KI), 2007. http://urn.kb.se/resolve?urn=urn:nbn:se:su:diva-6967.

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<p>In this project several tests were performed to evaluate the performance of an On-Board Imager® (OBI) mounted on a clinical linear accelerator. The measurements were divided into three parts; geometric accuracy, image registration and couch shift accuracy, and image quality. A cube phantom containing a radiation opaque marker was used to study the agreement with treatment isocenter for both kV-images and cone-beam CT (CBCT) images. The long term stability was investigated by acquiring frontal and lateral kV images twice a week over a 3 month period. Stability in vertical and longitudinal ro

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16

Mansouri, Boroujeni Nima. "A High-Order High-Accuracy Geometric Block Interface Treatment for Computational Aeroacoustics Codes." University of Toledo / OhioLINK, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1463099661.

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17

Jiang, Yiming. "Automated Generation of CAD Big Data for Geometric Machine Learning." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1576329384392725.

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18

Wang, Long Qi. "Translation accuracy comparison between machine translation and context-free machine natural language grammar–based translation." Thesis, University of Macau, 2018. http://umaclib3.umac.mo/record=b3950657.

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19

Vinther, Sven. "Active 3D object recognition using geometric invariants." Thesis, University of Cambridge, 1994. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.362974.

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20

Ecorchard, Gaël. "Static accuracy enhancement of redundantly actuated parallel kinematic machine tools." [Auerbach/Vogtl.] Verl. Wiss. Scripten, 2010. http://d-nb.info/1000285359/04.

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21

Ecorchard, Gaël. "Static Accuracy Enhancement of Redundantly Actuated Parallel Kinematic Machine Tools." Doctoral thesis, Universitätsbibliothek Chemnitz, 2010. http://nbn-resolving.de/urn:nbn:de:bsz:ch1-200902064.

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Redundant parallel kinematic machines are parallel mechanisms to which one or more kinematic branch is added in order to improve their mechanical properties, in particular, their stiffness. Redundant parallel kinematic machines have then more actuators than their degree of freedom. New calibration methods are developed in this thesis in order to deal with the particularities related to the actuation redundancy. First, calibration methods using geometrical models are tested. Several measurement systems and control models are compared. A self-calibration is also carried out, where the redundant

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22

Dillon, Joshua V. "Stochastic m-estimators: controlling accuracy-cost tradeoffs in machine learning." Diss., Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/42913.

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m-Estimation represents a broad class of estimators, including least-squares and maximum likelihood, and is a widely used tool for statistical inference. Its successful application however, often requires negotiating physical resources for desired levels of accuracy. These limiting factors, which we abstractly refer as costs, may be computational, such as time-limited cluster access for parameter learning, or they may be financial, such as purchasing human-labeled training data under a fixed budget. This thesis explores these accuracy- cost tradeoffs by proposing a family of estimators that ma

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23

Ecorchard, Gaël. "Static Accuracy Enhancement of Redundantly Actuated Parallel Kinematic Machine Tools." Doctoral thesis, Verlag Wissenschaftliche Scripten, Zwickau, 2008. https://monarch.qucosa.de/id/qucosa%3A19252.

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Redundant parallel kinematic machines are parallel mechanisms to which one or more kinematic branch is added in order to improve their mechanical properties, in particular, their stiffness. Redundant parallel kinematic machines have then more actuators than their degree of freedom. New calibration methods are developed in this thesis in order to deal with the particularities related to the actuation redundancy. First, calibration methods using geometrical models are tested. Several measurement systems and control models are compared. A self-calibration is also carried out, where the redundant

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24

Lau, Pak Fai. "CNC machining accuracy enhancement by tool path compensation method /." View abstract or full-text, 2005. http://library.ust.hk/cgi/db/thesis.pl?IEEM%202005%20LAU.

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25

Tan, Ning. "Calibration of micro and nanorobotic systems : Contribution of influential parameters to the geometric accuracy." Phd thesis, Université de Franche-Comté, 2013. http://tel.archives-ouvertes.fr/tel-01025313.

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Une des conditions fondamentales de la performance des système repose sur leur capacité à généré des déplacement avec précision de positionnement élevée. Cependant, à l'échelle micrométrique, de nombreux paramètres agissent et réduisent cette précision. A cette échelle, il est également particulièrement complexe de mesurer la précision de positionnement d'un système micro ou nanorobotique et donc d'identifier les différentes sources d'imprécision. L'étalonnage géométrique des systèmes micro et nanorobotiques prenant en compte ces différents sources est rarement étudié. Pour ces raisons, l'orig

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26

Myers, Alan. "The effect of concrete foundations and machine thermal conditions on the accuracy of large machine tools." Thesis, University of Huddersfield, 2017. http://eprints.hud.ac.uk/id/eprint/34454/.

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This thesis comprises of eighteen publications which describe research work which has been carried out into two aspects regarding the accuracy of large machine tools. The first six papers discuss the concrete foundations on which the machines are supported and the remaining twelve papers describe the consequences of thermal effects on machines. The publications are all ones of joint authorship, with the candidate being one of the named authors. Manufacturing industry and the precision requirements of large machine tools: The thesis reviews the range of errors and their causes that effect large

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27

Ramanaiah, Harikishan Veluru. "Relation between Process Capability Indices and Geometric Errors of Machine Tool." Thesis, KTH, Skolan för industriell teknik och management (ITM), 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-215977.

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28

Jiang, Xiaogeng. "Characterising geometric errors in rotary axes of 5-axis machine tools." Thesis, University of Birmingham, 2015. http://etheses.bham.ac.uk//id/eprint/5871/.

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It is critical to ensure that a 5-axis machine tool is operating within its geometric tolerance. However, there are various sources of errors influencing its accuracy; testing them with current methods requires expensive equipment and long machine down time. This motivates the development of a simple and fast way to identify and characterise geometric errors of 5-axis machine tools. A method using a Double Ball Bar (DBB) is proposed to characterise rotary axes Position Independent Geometric Errors (PIGEs), which are caused by imperfections during assembly of machine components. An established

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29

Duong, Nam duong. "Hybrid Machine Learning and Geometric Approaches for Single RGB Camera Relocalization." Thesis, CentraleSupélec, 2019. http://www.theses.fr/2019CSUP0008.

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Au cours des dernières années, la relocalisation de la caméra à base d'images est devenue un enjeu important de la vision par ordinateur appliquée à la réalité augmentée, à la robotique ainsi qu'aux véhicules autonomes. La relocalisation de la caméra fait référence à la problématique de l'estimation de la pose de la caméra incluant à la fois la translation 3D et la rotation 3D. Dans les systèmes de localisation, le composant de relocalisation de la caméra est nécessaire pour récupérer la pose de la caméra après le suivi perdu, plutôt que de redémarrer la localisation à partir de zéro.Cette thè

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30

Bhatia, Shaleen. "Effect of Machine Positional Errors on Geometric Tolerances in Additive Manufacturing." University of Cincinnati / OhioLINK, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1406820498.

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31

Su, Qinliang, and 蘇勤亮. "On convergence and accuracy of Gaussian belief propagation." Thesis, The University of Hong Kong (Pokfulam, Hong Kong), 2014. http://hdl.handle.net/10722/208046.

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32

Gkaliamoutsas, Pantelis. "Modeling fused filament fabrication machine height accuracy through layer thickness variation." Thesis, Massachusetts Institute of Technology, 2017. http://hdl.handle.net/1721.1/113766.

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Thesis: M. Eng. in Advanced Manufacturing and Design, Massachusetts Institute of Technology, Department of Mechanical Engineering, 2017.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (pages 85-88).<br>This thesis addresses the modeling and prediction of total height error of a 3D printed part using a layer-by-layer approach. Layer to layer thickness error is modeled across the build height of Polyactic acid (PLA) and Acrylonitrile butadiene styrene (ABS) parts. A height error compensation model is then formulated and applied at a G-code level to drive the mach

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33

Kovacs, Tim. "Strength or accuracy : credit assignment in learning classifier systems /." London [u.a.] : Springer, 2004. http://www.loc.gov/catdir/enhancements/fy0813/2003061884-d.html.

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34

Yu, Alexander. "Geometric method for the accuracy analysis of a class of 3-DOF planar parallel robots." Thesis, McGill University, 2009. http://digitool.Library.McGill.CA:80/R/?func=dbin-jump-full&object_id=66719.

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Planar parallel robot accuracy indices are evaluated because such robots are widely used in industrial applications where quick, precise positioning and alignment are essential. With their increasing use comes a need to develop a methodology to compare different parallel robot designs. However no simple method exists to adequately compare the accuracy of parallel robots. Certain indices have been used in the past such as dexterity, manipulability and global conditioning index, but they have inherent problems when applied to both translational and rotational motion of a parall

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35

Theissen, Nikolas Alexander. "Physics-based modelling and measurement of advanced manufacturing machinery’s positioning accuracy : Machine tools, industrial manipulators and their positioning accuracy." Licentiate thesis, KTH, Skolan för industriell teknik och management (ITM), 2019. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-263700.

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Advanced manufacturing machinery is a corner stone of essential industries of technologicallydeveloped societies. Their accuracy permits the production of complexproducts according to tight geometric dimensions and tolerances for high efficiency,interchangeability and sustainability. The accuracy of advanced manufacturingmachinery can be quantified by the performance measure of positioning accuracy.Positioning accuracy measures the closeness between a commanded and an attainedposition on a machine tool or industrial manipulator, and it is ruled by lawsof physics in classical mechanics and ther

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36

Laspas, Theodoros. "Modeling and measurement of geometric error of machine tools : Methodology and implementation." Thesis, KTH, Industriell produktion, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-157641.

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One of the main performance criteria for a machine tool is its ability to manufacture dimensionally and geometrically accurate parts. In this context evaluation of the geometric and kinematic accuracy of machine tools is important for achieving a high accuracy of machine parts. Moreover, the potential of predicting the accuracy of the machine tool outcome would benefit by reducing the non-value adding operations of machined parts measurement. The aim of this thesis is to develop a methodology for modeling geometric errors of machine tools in order to evaluate the geometric and kinematic accura

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37

Bhatnagar, Kovid. "Liver Segmentation by Geometric and Texture features using Support Vector Machine (LiGTS)." The Ohio State University, 2016. http://rave.ohiolink.edu/etdc/view?acc_num=osu1452224451.

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38

Kozáček, Peter. "Softwarové rozhraní pro uživatelské aplikace laser trackeru." Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2015. http://www.nusl.cz/ntk/nusl-231747.

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For assembly of product machine is necessary to evaluate a geometric accuracy of individual functional parts of the machine. This process is very demanding and time consuming. One of the reasons of mentioned problems is the lack of software (adaptation) for measuring of the accuracy of geometrical precision. This theses (diploma work) focuses at facilitating the development and creation of own application based on customer requirements and for measuring geometric accuracy with the Laser Tracker AT901 from Leica company. The aim is to create a basic application suitable for measurement of geome

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39

Nadella, Sunita. "Effect of machine vision based traffic data collection accuracy on traffic noise." Ohio : Ohio University, 2002. http://www.ohiolink.edu/etd/view.cgi?ohiou1174681979.

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40

Berry, Jethro. "Machine design to improve accuracy and repeatability in on-site circular milling." Master's thesis, University of Cape Town, 2010. http://hdl.handle.net/11427/10122.

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Includes bibliographical references (leaves 86-87).<br>This project's objective focuses on machine design to primarily improve accuracy and repeatability in on-site circular machining. On-site circular machining is used in the finishing and repairing of flanges most commonly used for mating with slewing bearings. The expected outcomes of the manufacturing processes are always increasing, therefore requiring higher levels of accuracy. The milling must be performed under a wide range of environmental conditions. The environmental conditions may prohibit the use of high accuracy measurement syste

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41

Ong, T. S. "Development of process planning methodology for end milled features specified with geometric toler." Thesis, Queen's University Belfast, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.396216.

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42

Uddin, Mohammad Sharif. "Tool Path Modification Approaches to Enhance Machining Geometric Accuracy in 3-Axis and 5-Axis Machining." 京都大学 (Kyoto University), 2007. http://hdl.handle.net/2433/49142.

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学位授与大学：京都大学 ; 取得学位: 博士(工学) ; 学位授与年月日: 2007-09-25 ; 学位の種類: 新制・課程博士 ; 学位記番号: 工博第2861号 ; 請求記号: 新制/工/1420 ; 整理番号: 25546<br>Introduction Precision manufacture of components has become a necessity in the present day manufacturing sectors. The ever-increasing demands of humankind have forced researchers to come up with more improved innovations in technology; achieving higher levels of integration in microprocessors, and creating more versatile and precision multitasking systems being just a few of the major drivers in this area. All these, however, have one rudimentary requirement, namely, the need

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Henrico, Ivan. "Geometric accuracy improvement of VHR satellite imagery during orthorectification with the use of ground control points." Thesis, University of Pretoria, 2016. http://hdl.handle.net/2263/60812.

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Conducting single frame orthorectification on satellite images to create an ortho-image requires four basic components, namely an image, a geometric sensor model, elevation data (for example a digital elevation model (DEM)) and ground control points (GCPs). For this study, orthorectification was executed numerous times (in three stages) and each time components were altered to test the geometric accuracy of the resulting ortho-image. Most notably, the distribution and number of ground control points, the quality of the elevation source and the geometric sensor model or lack thereof were altere

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44

Allen, James. "A general approach to CNC machine tool thermal error reduction." Thesis, University of Huddersfield, 1997. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.285842.

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45

Lee, Jinho. "Design of controllers for improving contour accuracy in a high-speed milling machine." [Gainesville, Fla.] : University of Florida, 2005. http://purl.fcla.edu/fcla/etd/UFE0010702.

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46

Mohan, Sumod K. "Accuracy and multi-core performance of machine learning algorithms for handwritten character recognition." Connect to this title online, 2009. http://etd.lib.clemson.edu/documents/1252424826/.

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47

Tawha, Tafadzwa Primrose Rudo. "Assessing the accuracy of the zygoma for estimating ancestry using geometric morphometrics in a South African sample." Master's thesis, Faculty of Health Sciences, 2019. http://hdl.handle.net/11427/31282.

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The large number of unidentified, decomposed and skeletonised remains found in South Africa (SA) necessitates relevant and reliable methods to assist in victim identification. Ancestry estimation from unknown skeletal remains is essential when reconstructing a demographic profile of a missing person. In the SA population, estimating ancestry is problematic as standards developed internationally rarely apply to the local, biologically heterogenous population. Craniofacial morphology is known to be ancestrally distinct and studies are yet to explore shape and size variation in the zygomatic bone

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48

Kazan, Baran. "Additional Classes Effect on Model Accuracy using Transfer Learning." Thesis, Högskolan i Gävle, Datavetenskap, 2020. http://urn.kb.se/resolve?urn=urn:nbn:se:hig:diva-33970.

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This empirical research study discusses how much the model’s accuracy changes when adding a new image class by using a pre-trained model with the same labels and measuring the precision of the previous classes to observe the changes. The purpose is to determine if using transfer learning is beneficial for users that do not have enough data to train a model. The pre-trained model that was used to create a new model was the Inception V3. It has the same labels as the eight different classes that were used to train the model. To test this model, classes of wild and non-wild animals were taken as

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49

Huang, Kuang Peng, and 黃光鵬. "Geometric Parameter Identification and Accuracy Analysis of a New Machine Tool." Thesis, 2000. http://ndltd.ncl.edu.tw/handle/83280424565732728354.

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碩士<br>國立臺灣科技大學<br>機械工程系<br>88<br>This work investigates the geometric parameter identification and the accuracy analysis of a new parallel-type machine tool. The research first establishes a mathematical model and a calibration method for this machine. The model includes forward kinematics, inverse kinematics and parameter identification. For calibration, it is recommended that the positions of the machine tool be measured through three separate steps. Since the prototype machine has not been ready for operation, parameter identification procedure is examined by computer simulation. Error an

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Lechleitner, Maria. "Small data oversampling: improving small data prediction accuracy using the geometric SMOTE algorithm." Master's thesis, 2020. http://hdl.handle.net/10362/99077.

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Dissertation presented as the partial requirement for obtaining a Master's degree in Data Science and Advanced Analytics<br>In the age of Big Data, many machine learning tasks in numerous industries are still restricted due to the use of small datasets. The limited availability of data often results in unsatisfactory prediction performance of supervised learning algorithms and, consequently, poor decision making. The current research work aims to mitigate the small dataset problem by artificial data generation in the pre-processing phase of the data analysis process. The oversampling techn

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