An Optimization Strategy for Maximizing Coordinate Measuring Machine Productivity, Part 2: Problem Formulation, Solution, and Experimental Results

1995 ◽  
Vol 117 (4) ◽  
pp. 610-618 ◽  
Author(s):  
S. D. Jones ◽  
A. Galip Ulsoy
Keyword(s):  
Golden Section ◽  
Coordinate Measuring Machine ◽  
Sensitivity Study ◽  
Experimental Results ◽  
Motor Power ◽  
Optimization Strategy ◽  
Connecting Rod ◽  
Measurement Quality ◽  
Machine Productivity ◽  
Measuring Machine

In this, the second of two papers focused on optimizing CMM productivity, a strategy is presented for obtaining operating speeds that maximize CMM throughput. The strategy involves posing the objective and constraints in terms of a nonlinear programming problem. The objective is to minimize measuring time, and constraints are on measurement quality, available motor power and other machine specific characteristics. Solutions to various measurement scenarios are given, computed with a generalized conjugate gradient method that uses a golden section acceptable search method. Also, a sensitivity study is presented that utilizes the optimization strategy to determine how change to a CMM’s design will affect overall productivity. In the final section, experimental results utilizing the optimally computed trajectories for both single axis and multiple axis motion are given. In addition, an example is presented to demonstrate the implementation of the optimization strategy in an actual measuring application. In the example, a connecting-rod is measured at three speeds: the machine’s default speed, a speed constrained by available motor power, and the optimized speed (constrained additionally by measurement quality). The experiment demonstrates a 27 percent reduction in time for the optimized speed compared to the default speed using the Bartlett test for comparing variances in the dimensional data obtained.

An Optimization Strategy for Maximizing Coordinate Measuring Machine Productivity, Part 1: Quantifying the Effects of Operating Speed on Measurement Quality

1995 ◽  
Vol 117 (4) ◽  
pp. 601-609 ◽  
Author(s):  
S. D. Jones ◽  
A. Galip Ulsoy
Keyword(s):  
Coordinate Measuring Machine ◽  
Operating Speed ◽  
Production Operation ◽  
Optimization Strategy ◽  
Factors Affecting ◽  
Measurement Quality ◽  
Machine Productivity ◽  
Study Results ◽  
Dimensional Measurements ◽  
Measuring Machine

The ability to quickly obtain precise dimensional information about manufactured parts is vital for any successful mass production operation. Coordinate Measuring Machines (CMMs) can be used to obtain dimensional measurements, but the effects of structural vibrations often limit the speed at which measurements can be obtained. In this, the first of two papers, the effects of operating speed on CMM measurement quality are illustrated, and the factors affecting measurement speed are then analyzed through an Analysis of Variance (ANOVA) study. Results of the illustration and ANOVA show that as operating speed increases, the quality of the measurements obtained decreases, and that the individual axes of the prismatic CMM structure experimentally evaluated react differently to measuring speeds. Also given are results that show the trade-off between measurement time and quality and indicate the existence of optimal operating speeds for certain values of measurement quality. A model is then developed that describes the relationship between measurement speed and measurement quality for use in the optimization strategy presented in Part 2 of this paper.

Hardware Design of a Planar Platform for Naro-CMM

2013 ◽  
Vol 706-708 ◽  
pp. 1146-1149
Author(s):  
Hui Zhi Sun
Keyword(s):  
Hardware Design ◽  
Coordinate Measuring Machine ◽  
Modern Technology ◽  
Experimental Results ◽  
Power Module ◽  
Positioning Accuracy ◽  
Technology Platform ◽  
Fast Development ◽  
Measuring Machine ◽  
Planar Mode

Nanometer three Coordinate Measuring Machine (Naro-CMM) has got fast development especially in the advancement of modern technology. Platform is an important part of the Naro-CMM, paper puts forward a new way to drive platform. “Planar” mode is adopted, and the power module is designed based on L6234PD, the experimental results express that the positioning accuracy of the platform reaches nanometer accuracy. So the drive method satisfied the demand of this platform’s movement.

A Kinematic Model for Parallel-Joint Coordinate Measuring Machine

2013 ◽  
Vol 5 (4) ◽  
Author(s):  
Jie Li ◽  
Lian-Dong Yu ◽  
Jing-Qi Sun ◽  
Hao-Jie Xia
Keyword(s):  
Mathematical Modeling ◽  
Data Processing ◽  
Newton Method ◽  
Measurement Accuracy ◽  
Kinematic Model ◽  
Coordinate Measuring Machine ◽  
Experimental Results ◽  
Kinematic Modeling ◽  
Kinematic Parameters ◽  
Measuring Machine

The typical nonorthogonal coordinate measuring machine is the portable coordinate measuring machine (PCMM), which is widely applied in manufacturing. In order to improve the measurement accuracy of PCMM, structural designing, data processing, mathematical modeling, and identification of parameters of PCMM, which are essential for the measurement accuracy, should be taken into account during the machine development. In this paper, a kind of PCMM used for detecting the crucial dimension of automobile chassis has been studied and calibrated. The Denavit–Hartenberg (D–H) kinematic modeling method has often been used for modeling traditional robot, but the D–H error representation is ill-conditioned when it is applied to represent parallel joints. A modified four-parameter model combined with D–H model is put forward for this PCMM. Based on the kinematic model, Gauss–Newton method is applied for calibrating the kinematic parameters. The experimental results indicate the improvement of measuring accuracy and the effectiveness of the PCMM based on the proposed method.

scholarly journals Number of Points for Roundness Measurement - Measured Results Comparison

2011 ◽  
Vol 19 (30) ◽  
pp. 19-24
Author(s):  
Augustín Görög
Keyword(s):  
Least Squares ◽  
Coordinate Measuring Machine ◽  
Experimental Results ◽  
Cylindrical Grinding ◽  
Minimum Zone ◽  
Measuring Machine ◽  
Roundness Measurement

Number of Points for Roundness Measurement - Measured Results Comparison Paper deals with filtering roundness. It presents experimental results measured for roundness turning and cylindrical grinding. Roundness was measured using Prismo Navigator 5 coordinate measuring machine. Evaluation was done by four methods: Minimum zone reference circles (MZCI), Least squares reference circle (LSCI), Minimum circumscribed reference circle (MCCI) and Maximum inscribed reference circle (MICI). The filters used were: Gauss, Spline and no filter.

The Study on Position Accuracy of Micro-Coordinate Measuring Machine

2008 ◽  
Author(s):  
Chuan Yang ◽  
Qiang Zhao ◽  
Yu-Long Zhao ◽  
Wei-Xuan Jing
Keyword(s):  
Control System ◽  
Pid Control ◽  
Fuzzy Inference ◽  
Coordinate Measuring Machine ◽  
Experimental Results ◽  
Positioning Accuracy ◽  
Loop Control ◽  
Positioning Stage ◽  
Stepper Motors ◽  
Measuring Machine

In order to measure the microcosmic profiles of ultra-smooth surfaces, a high-accuracy noncontact micro-Coordinate Measuring Machine (micro-Coordinate Measuring Machine, micro-CMM) is developed in this paper. The working table of this measurement device is located by a macro-micro dual-drive system. A closed-loop control system, which is composed by a laser interferometer and stepper motors, is adopted to improve the positioning accuracy of the macro-positioning stage. The experimental results show that the positioning accuracy of this system is obviously improved and satisfies the positioning requirement of the macro-positioning stage. Because the positioning accuracy of the flexure-based micro-positioning stage can not satisfy the design requirement under the control of the traditional PID control, A PID control system based on Adaptive Neural-Fuzzy Inference is proposed to improve the control accuracy of the micro-positioning stage. The experimental results show that this system can improve the positioning accuracy of the micro-positioning stage, and basically meets the requirement of the design.

scholarly journals Evaluation of dimensional accuracy of dental bridges manufactured with conventional casting technique and CAD/CAM system with Ceramill Sintron blocks using CMM

2018 ◽  
Vol 12 (4) ◽  
pp. 264-271 ◽  
Author(s):  
Alireza Izadi ◽  
Fariborz Vafaee ◽  
Arash Shishehian ◽  
Ghodratollah Roshanaei ◽  
Behzad Fathi Afkari
Keyword(s):  
Reference Model ◽  
Coordinate Measuring Machine ◽  
Dimensional Accuracy ◽  
Three Dimensions ◽  
Casting Technique ◽  
Dimensional Changes ◽  
Conventional Casting ◽  
Cad Cam ◽  
Milling Method ◽  
Measuring Machine

Background. Recently, non-presintered chromium-cobalt (Cr-Co) blocks with the commercial name of Ceramill Sintron were introduced to the market. However, comprehensive studies on the dimensional accuracy and fit of multi-unit frameworks made of these blocks using the coordinate measuring machine (CMM) are lacking. This study aimed to assess and compare the dimensional changes and fit of conventional casting and milled frameworks using Ceramill Sintron. Methods. A metal model was designed and scanned and 5-unit frameworks were fabricated using two techniques: (I) the conventional casting method (n=20): the wax model was designed, milled in the CAD/CAM machine, flasked and invested; (II) the milling method using Ceramill Sintron blocks (n=20): the wax patterns of group 1 were used; Ceramill Sintron blocks were milled and sintered. Measurements were made on the original reference model and the fabricated frameworks using the CMM in all the three spatial dimensions, and dimensional changes were recorded in a checklist. Data were analyzed with descriptive statistics, and the two groups were compared using one-way ANOVA and Tukey test (α=0.05). Results. The fabricated frameworks in both groups showed significant dimensional changes in all the three dimensions. Comparison of dimensional changes between the two groups revealed no significant differences (P>0.05) except for transverse changes (arch) that were significantly greater in Ceramill Sintron frameworks (P<0.05). Conclusion. The two manufacturing processes were the same regarding dimensional changes and the magnitude of marginal gaps and both processes resulted in significant dimensional changes in frameworks. Ceramill Sintron frameworks showed significantly greater transverse changes than the conventional frameworks.

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