Author: Yashica N. HuntPublisher:
ISBN:
Category : Measurement
Languages : en
Pages : 170
Book Description
Measurement Uncertainty Analysis for Coordinate Measuring Machines
Author: Yashica N. HuntPublisher:
ISBN:
Category : Measurement
Languages : en
Pages : 170
Book Description
Error Evaluation and Uncertainty Analysis for a Five-axis Multi-sensor Coordinate Measuring Machine
Author: Prashanth RamuPublisher:
ISBN:
Category :
Languages : en
Pages : 220
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.
Coordinate Metrology
Author: Jerzy A. SładekPublisher: Springer
ISBN: 366248465X
Category : Technology & Engineering
Languages : en
Pages : 472
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.
Coordinate Measuring Machines and Systems
Author: Robert J. HockenPublisher: CRC Press
ISBN: 1420017535
Category : Technology & Engineering
Languages : en
Pages : 586
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
SPC Techniques for the M-48 Coordinate Measurement Machine Applied to Uncertainty Analysis and Monitoring
Author: Publisher:
ISBN:
Category :
Languages : en
Pages : 6
Book Description
The Moore M-48 Coordinate Measuring Machine (CMM) is used to calibrate step gages, ball bars and hole plates. The expanded uncertainty (2 sigma) of the M-48 CMM was determined to be "0.3 + 0.4 L microns (L is length in meters), using the decomposition method. The problem statement becomes, how does one monitor and control the calibration process to ensure that one maintains this level of reliability? Traditional methods of statistical process control, such as X-bar and R charts assume large lot production and are designed to detect changes in the process being monitored. Since calibrations are performed one at a time, with sometimes years between calibrations, standard control charting methodology falls a bit short of what is needed to maintain process capability. Upon examination of the process uncertainty for the M-48 CMM the author finds the following parameters play an important roll in process capability. Since the M-48 uses laser scales, the Edlen equation is used to convert pressure, temperature and humidity to wavelength correction. The largest source of uncertainty comes from temperature effects based on gradients, accuracy of the thermistors and the actual coefficient of thermal expansion of the artifact. The probe calibration, which is performed for each calibration, is another important variable. Since the M-48 CMM's movement is very slow, drift is also an important parameter to monitor. The paper describes the selection of check standards and measurement protocol made.
An Internet Based Software System for Gage R & R and Measurement Uncertainty Analysis
Author: Sivaramakrishnan VenkatachalamPublisher:
ISBN:
Category :
Languages : en
Pages : 242
Book Description
The inherent variation in any measurement process can be quantified by two widely adopted methods, the Gage Repeatability and Reproducibility (Gage R & R) and measurement uncertainty. The former uses techniques based on statistical methods while the latter uses a combination of statistics and prior knowledge about the measurement process to estimate the measurement variation. The goal of this project is to develop an internet based software system for evaluation of measurement process variation through a gage R & R study and estimation of uncertainty in measurements. The gage R & R system is a client-server architecture system that aids in the computation of process variation parameters. The measurement uncertainty software system is a three-tier system developed in accordance with the "Guide to the Expression of Uncertainty in Measurements" (GUM). The software, developed using Java and Oracle, can be accessed across the internet with the help of a Java enabled web browser. As a specific case of measurement uncertainty estimation, a procedure for the estimation of task-specific uncertainty for CMM (Coordinate Measuring Machine) measurements using computer simulation has been developed. This method involves measuring a virtual part on a virtual CMM (developed from a library of machines, all having a complete description of the machine parametric errors). The various sources of errors are added as modules to simulate real-time measurement conditions. The measurement is repeated over a number of iterations and the results are reported using standard statistical techniques.
Measurement Uncertainty Considerations for Coordinate Measuring Machines
Author: Steven D. PhillipsQuantification of Measurement Uncertainty and Performance Assessment of Coordinate Measuring Machines
Author: Jeffrey Robert WilhelmiPublisher:
ISBN:
Category :
Languages : en
Pages : 140
Book Description
Coordinate metrology
Author: Rainer HegelmannPublisher:
ISBN: 9783894291587
Category :
Languages : en
Pages : 80
Book Description
An Introduction to Uncertainty in Measurement
Author: L. KirkupPublisher: Cambridge University Press
ISBN: 1139454900
Category : Science
Languages : en
Pages : 196
Book Description
Measurement shapes scientific theories, characterises improvements in manufacturing processes and promotes efficient commerce. In concert with measurement is uncertainty, and students in science and engineering need to identify and quantify uncertainties in the measurements they make. This book introduces measurement and uncertainty to second and third year students of science and engineering. Its approach relies on the internationally recognised and recommended guidelines for calculating and expressing uncertainty (known by the acronym GUM). The statistics underpinning the methods are considered and worked examples and exercises are spread throughout the text. Detailed case studies based on typical undergraduate experiments are included to reinforce the principles described in the book. This guide is also useful to professionals in industry who are expected to know the contemporary methods in this increasingly important area. Additional online resources are available to support the book at www.cambridge.org/9780521605793.