Author: Guido Tosello
Publisher:
ISBN:
Category :
Languages : en
Pages : 164

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Author: Kalyana Phanidhar Bhamidi
Publisher:
ISBN:
Category :
Languages : en
Pages : 164

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Book Description
Hybrid (or Multi sensor) Coordinate Measuring Machines (CMMs) belong to a new generation of CMMs, gaining popularity in the current world market due to the flexibility of changing the sensing device without having to re-establish the part coordinate system. The distinction we make between hybrid and conventional CMMs, which permit multiple measurement methods, is that the different sensors in a hybrid system have different metrology loops. Despite the many advantages these CMMs have, there are no standards documented for the performance of such multi-sensor CMMs. The assessment of the errors or uncertainty present in the use of each probing system may be done in a manner similar to that described in the existing B89.4.1 standard (multi-tip), but the quantification of these errors has not been studied. The primary focus of this thesis is a better understanding of the performance of these machines when measuring the same artifact with different sensors and development of artifacts and procedures to document the uncertainty associated with these measurements. Performance tests such as the multi-tip test, drift test, repeatability, grid test, squareness, and scale error tests have been conducted on several multi sensor CMMs to quantify the errors associated in the machine. There is an urgent need for documenting a standard for hybrid CMMs, both to better understand them and to support the users of these kinds of machines. This thesis documents an important step in this direction.

Author: Prashanth Ramu
Publisher:
ISBN:
Category :
Languages : en
Pages : 220

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Book Description
Any combination of contact and non contact sensors on a single coordinate measuring machine makes it a multi-sensor or hybrid coordinate measuring machine. The ability to change the probing device without re-establishing the part coordinate system is a significant advantage and consequently the reason for their wide acceptance and usage. In addition to the existing three linear stages in a conventional or hybrid coordinate measuring machine, they are augmented with two rotary stages in order to make them more versatile. Augmenting a conventional or hybrid measuring machine with rotary stages not only complicates the metrology loop but also adds a few more parametric errors to an existing list of known twenty one parametric error terms for a three stage conventional measuring machine. Also different probing sensors in the system have different metrology loops. A literature survey reveals that there are no previous or current work on parametric machine modeling, error evaluation, correction for the same and uncertainty analysis for machines of this class with a wide potential for measuring complex parts quickly and with great ease. The current work focuses on developing a parametric model for a five-axis, multi-sensor coordinate measuring machine of a specific configuration. Measurement techniques for estimating the parametric errors, techniques for compensating the same and methods to estimate measurement uncertainty on five-axis, multi-sensor coordinate measuring machines are proposed. A comparison between the results from error budgeting by the method of constraints for such high precision measuring machines with those from conventional methods based on estimates of subsystem errors are also presented.

Author: Jerzy A. Sładek
Publisher: Springer
ISBN: 366248465X
Category : Technology & Engineering
Languages : en
Pages : 472

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Book Description
This book focuses on effective methods for assessing the accuracy of both coordinate measuring systems and coordinate measurements. It mainly reports on original research work conducted by Sladek’s team at Cracow University of Technology’s Laboratory of Coordinate Metrology. The book describes the implementation of different methods, including artificial neural networks, the Matrix Method, the Monte Carlo method and the virtual CMM (Coordinate Measuring Machine), and demonstrates how these methods can be effectively used in practice to gauge the accuracy of coordinate measurements. Moreover, the book includes an introduction to the theory of measurement uncertainty and to key techniques for assessing measurement accuracy. All methods and tools are presented in detail, using suitable mathematical formulations and illustrated with numerous examples. The book fills an important gap in the literature, providing readers with an advanced text on a topic that has been rapidly developing in recent years. The book is intended for master and PhD students, as well as for metrology engineers working at industrial and research laboratories. It not only provides them with a solid background for using existing coordinate metrology methods; it is also meant to inspire them to develop the state-of-the-art technologies that will play an important role in supporting quality growth and innovation in advanced manufacturing.

Author: Robert J. Hocken
Publisher: CRC Press
ISBN: 1420017535
Category : Technology & Engineering
Languages : en
Pages : 586

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Book Description
Since John Bosch edited and published the first version of this book in 1995, the world of manufacturing and coordinate measuring machines (CMMs) and coordinate measuring systems (CMSs) has changed considerably. However, the basic physics of the machines has not changed in essence but have become more deeply understood. Completely revised and updat

Author: Robert Roithmeier
Publisher: Carl Zeiss AG
ISBN:
Category :
Languages : en
Pages : 111

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Book Description
Today, there is hardly any workpiece whose form parameters cannot be measured by means of coordinate measuring machines. The universal use of these machines allows a wide range of application of this technology which, however, increases inevitably the complexity of its handling. The numerous options of the machine-specific operating software on the one hand and the various theoretical considerations regarding a target-oriented treatment of measuring jobs on the other hand result in the fact that the measuring results obtained from the same coordinate measuring machine on the same workpiece under similar conditions may differ. In Order to increase the comparability of measuring results, it is necessary to provide the operators of coordinate measuring machines –in addition to a well-founded AUKOM training – with procedure options for planning, performing, evaluating and documenting measurements. This book by the ZEISS Metrology Academy makes a contribution towards achieving these targets.

Author: Rainer Hegelmann
Publisher:
ISBN: 9783894291587
Category :
Languages : en
Pages : 80

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Author: John A. Bosch
Publisher: CRC Press
ISBN: 9780824795818
Category : Technology & Engineering
Languages : en
Pages : 476

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Book Description
This work reviews the basic concepts of co-ordinate metrology. It defines what co-ordinate measuring machines (CMMs) are and details how they can be applied to gain a competitive advantage in a variety of business settings, from small machine shops to global manufacturers. Areas that are critical for the successful application of CMMs - including environmental factors, the measuring of speed and accuracy, traceability, versatility and programming methodology - are considered.;The book is intended for manufacturing, mechanical, quality control, design, industrial, automation, automotive and aerospace engineers and managers, as wel as upper-level undergraduate and graduate students in these disciplines.;College or university bookstores may order five or more copies at a special student price, which is available from Marcel Dekker Inc upon request.

Author: Hugo Manuael Pinto Lobato
Publisher:
ISBN:
Category :
Languages : en
Pages :

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Book Description
The growing demand for ever more greener aero engines has led to ever more challenging designs and higher quality products. An investigation into Coordinate Measuring Machine measurement uncertainty using physical measurements and virtual simulations revealed that there were several factors that can affect the measurement uncertainty of a specific task. Measurement uncertainty can be affected by temperature, form error and measurement strategy as well as Coordinate Measuring Machine specification. Furthermore the sensitivity of circular features size and position varied, when applying different substitute geometry algorithms was demonstrated. The Least Squares Circle algorithm was found to be more stable when compared with the Maximum Inscribed Circle and the Minimum Circumscribed Circle. In all experiments it was found that the standard deviation when applying Least Squares Circle was of smaller magnitude but similar trends when compared with Maximum Inscribed Circle and the Minimum Circumscribed Circle. A Virtual Coordinate Measuring Machine was evaluated by simulating physical measurement scenarios of different artefacts and different features. The results revealed good correlation between physical measurements uncertainty results and the virtual simulations. A novel methodology for the automated assessment of leading edge airfoil profiles was developed by extracting the curvature of airfoil leading edge, and the method lead to a patent where undesirable features such as flats or rapid changes in curvature could be identified and sentenced. A software package named Blade Inspect was developed in conjunction with Aachen (Fraunhoufer) University for the automated assessment and integrated with a shop floor execution system in a pre-production facility. The software used a curvature tolerancing method to sentence the leading edge profiles which aimed at removing the subjectivity associated with the manual vision inspection method. Initial trials in the pre-production facility showed that the software could sentence 200 profiles in 5 minutes successfully. This resulted in a significant improvement over the current manual visual inspection method which required 3 hours to assess the same number of leading edge profiles.

Author: Yashica N. Hunt
Publisher:
ISBN:
Category : Measurement
Languages : en
Pages : 170

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Book Description