Development of a Measuring System for Planar Cam Profiles and Their Follower Motions

2004 ◽  
Author(s):  
Der-Min Tsay ◽  
Kuo-Shu Tseng ◽  
Hsin-Pao Chen
Keyword(s):  
Contact Point ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Displacement Curve ◽  
Practical Application ◽  
Test Bed ◽  
Theoretical Design ◽  
Cam Profile ◽  
Computing Procedure ◽  
Measuring Machine

A measuring system that can be used to inspect planar cam contours and to evaluate their follower displacement, velocity, and acceleration curves with a higher degree of accuracy without the aid of approximating follower displacements in traditional methods is constructed. Based on the geometric relationships at the contact point between a planar cam profile and its follower, analytical descriptions that can be utilized to determine the follower displacement curve and its derivatives are first identified. To verify the feasibility and accuracy of the algorithms proposed for the measuring system, analytical results generated from a theoretical design are compared to those obtained by the application of the computing procedure. To demonstrate the effectiveness and usefulness of the developed procedure, a measuring test bed has been constructed for a practical application example. Furthermore, the results obtained by using the built measuring system are also compared to those obtained by using a coordinate measuring machine (CMM) with the proposed algorithms.

A Procedure for Measuring Planar Cam Profiles and Their Follower Motions

2005 ◽  
Vol 128 (3) ◽  
pp. 697-704 ◽  
Author(s):  
Der-Min Tsay ◽  
Kuo-Shu Tseng ◽  
Hsin-Pao Chen
Keyword(s):  
Contact Point ◽  
Coordinate Measuring Machine ◽  
Displacement Velocity ◽  
Displacement Curve ◽  
Practical Application ◽  
Test Bed ◽  
Traditional Methods ◽  
Theoretical Design ◽  
Cam Profile ◽  
Measuring Machine

A procedure that can be used to inspect planar cam contours and to evaluate their follower displacement, velocity, and acceleration curves with a higher degree of accuracy, without the aid of approximating follower displacements in traditional methods, is constructed. Based on the geometric relationships at the contact point between a planar cam profile and its follower, analytical descriptions that can be utilized to determine the follower displacement curve and its derivatives are first identified. To verify the feasibility and accuracy of the proposed procedure, analytical results generated from a theoretical design are compared to those obtained by the application of the procedure. To demonstrate the effectiveness and usefulness of the developed procedure, a measuring test bed has been constructed for a practical application example. Furthermore, the results obtained by using the developed procedure with the built measuring test bed are also compared to those obtained by using a coordinate measuring machine with the proposed algorithms.

Study of Large Scale Measurement Method Based on Leapfrog Principle

2011 ◽  
Vol 130-134 ◽  
pp. 1560-1563
Author(s):  
Long Jiang Zheng ◽  
Xue Li ◽  
Ling Ling Qin ◽  
Hong Bin Chen ◽  
Xue Gao ◽  
...  
Keyword(s):  
Coordinate Transformation ◽  
Large Scale ◽  
Manufacturing Industry ◽  
Coordinate Measuring Machine ◽  
Measuring Method ◽  
Measuring System ◽  
Wide Range ◽  
General Coordinate Transformation ◽  
Measuring Machine ◽  
The Mathematical Model

At present，large scale and space coordinates measuring system with wide-range and high-precision has been widely used in modern manufacturing industry. In this paper, large scale measuring method based on leapfrog principle of flexible three coordinate measuring machine is described. The mathematical model of coordinate transformation is built and the general coordinate transformation formula after number of times leapfrogging is derived. The best positioning and each step of leapfrog are given.

scholarly journals The accuracy of calculating form deviations of selected free-form surfaces

Mechanik ◽  
2017 ◽  
Vol 90 (11) ◽  
pp. 1035-1037
Author(s):  
Marek Magdziak ◽  
Andrzej Kawalec
Keyword(s):  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Free Form ◽  
Experimental Investigations ◽  
Simulation Studies ◽  
Numerical Investigations ◽  
Measuring Machine ◽  
Coordinate Measurements ◽  
Simulation Results ◽  
Free Form Surfaces

The possible reason for the incorrect form deviations calculated using an algorithm available in the selected software of coordinate measuring machine was identified. This method is available in the Calypso software and it is based on local deviations calculated at nominal points. The analysis was made for the selected examples of free-form surfaces. There are presented the results of numerical investigations based on simulations of coordinate measurements of selected object. The measured points were generated with assumed values of scatter in relation to the nominal profiles of the analyzed product. The simulations were made using 3 selected methods for computing the form deviations and various distances between the measured points. In order to verify the results of simulation studies there were made experimental investigations. The experimental investigations were done using selected coordinate measuring system and chosen measurement parameters. The results of performed measurements confirm the simulation results.

NON-CON NON-CONTACT POINT MEASURING EQUIPMEN T MEASURING EQUIPMENT FOR ROBO T FOR ROBOTIC SYSTEMS OF AUTOMOBILE INDUSTRY

2020 ◽  
Vol 2020 (4) ◽  
pp. 232-238
Author(s):  
J Khollhujayev ◽  
◽  
N Abdukarimov ◽  
J Mavlonov ◽  
N Abdivahidova
Keyword(s):  
Contact Point ◽  
Measuring System ◽  
Vehicle Body ◽  
Inspection Time ◽  
Robotic Arm ◽  
Small Scale ◽  
Prototype Model ◽  
Laser Sensor ◽  
Body Frame ◽  
Measuring Machine

The non-contact measurement method development is caused by the need for precise measurement and elimination of an operator’s errors. The purpose of the atticle research is to develop a reliable small scale prototype model of non-contact point measuring system. The mathematical model of robotic articulated arm has been developed to analyze the forward kinematics. Then, the prototype model of a robotic arm and laser-sensor mounted technique have been developed to take the measurements. The idea was derived from the coordinate measuring machine working principle, that puts the tip or tool center point in the known position with necessary precision. Most of the production engineers rely on the measurement data obtained from the CMMs. Most of the CMMs used in Uzbekistan are mainly contact based CMMs that have a number of disadvantages, i.e. a liitle inspection time. Also, the ergonomics and redundancy of the CMMs body frame are not acceptable. The surfaces of a vehicle body frame are designed in the free forms to give better aerodynamics and smaller resistance coefficients that result in difficult shapes that is not possible to reach easily with the ordinary CMM. The scientifically-developed robotic arm based on the non-contact CMM helps to cope with this issues

Design and Development of a Novel Coordinate Measuring Machine with 3-PUU Parallel Mechanism

2014 ◽  
Vol 625 ◽  
pp. 34-41
Author(s):  
Song Yuan Li ◽  
Peng Hao Hu
Keyword(s):  
Parallel Mechanism ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Kinematics Model ◽  
Measuring Accuracy ◽  
Measuring Machine ◽  
Motion Characteristics ◽  
Principle Of Maximum ◽  
Direct Kinematics ◽  
Measuring Space

A bran-new style coordinate measuring system with 3-PUU parallel mechanism and its advantages was proposed which could realize 3D measurement with only one linear grating and two precision guides. Firstly, measuring space with a 0.05mm error of structure parameter as target was explored based on 6 bars direct kinematics model, workspace and error model, and then the principle of maximum measuring space was presented to elaborate the relationship between measuring space and length of bar. Then in order to enlarge the scale of measuring space of Coordinate Measuring Machine (CMM), improve the measuring accuracy and flexibility of CMM, the key dimensions and positional parameters of CMM were optimization designed according to the direct kinematics model and the principle of maximum measuring space. Finally the deformation of key components was processed by Finite Element Method (FEM) according to the motion characteristics and parameters of the new CMM prototype, so that the affect of deformation to measuring accuracy can be controlled and decreased. Results are shown that the measuring space of CMM is 1100mm in x axis, 535mm in y axis, 426mm in z axis; deformation of beam is the main reason to influence the measuring accuracy and should be offset after calibration.

scholarly journals Comparison of measurement using optical measuring systems and coordinate measuring machine

2020 ◽  
Vol 26 (2) ◽  
pp. 35-41
Author(s):  
Milan Simonović ◽  
Dragan Lazarević ◽  
Marko Simonović ◽  
Bogdan Nedić
Keyword(s):  
Coordinate Measuring Machine ◽  
Complex Configuration ◽  
Measuring System ◽  
Measuring Systems ◽  
Measurement Result ◽  
Optical Measuring ◽  
Measurement Results ◽  
Final Measurement ◽  
Measuring Machine ◽  
The Way

The paper presents the results of measuring the gearbox housing with the ATOS optical measuring system, the TRITOP system and the "TESA micro-hit 4-5-4" coordinate measuring machine. The aim of the study was to determine the differences in modern measuring systems and whether these differences affect the final measurement result when controlling parts of a complex configuration. At the beginning of the paper, the way of functioning of the used measuring systems and the results of research in this area are described. GOM Inspect software used for the ATOS and TRITOP measuring systems, while PC DMIS software used for the coordinate measuring machine. The analysis of the obtained results showed that there are significant differences in the measurement results and that the measuring systems used can't be applied with the same success to the measurement of parts of complex configuration such as the gearbox housing.

Data Process for Reverse Engineering Technology

2012 ◽  
Vol 549 ◽  
pp. 1012-1016
Author(s):  
Hui Guo ◽  
Yan Hui Hu ◽  
Xiao Jing Li
Keyword(s):  
Reverse Engineering ◽  
Coordinate Measuring Machine ◽  
Complex Data ◽  
Practical Application ◽  
Engineering Technology ◽  
Data Process ◽  
Surface Data ◽  
Data Points ◽  
Measuring Machine ◽  
Fitting In

Reverse engineering has become an important tool for CAD model construction from the data points, measured by a coordinate measuring machine (CMM), of an existing part. However, due to special structure and complex topology relation, obtaining full surface data of a prototype is not an easy thing and should carry out complex data process procedure to get global model. The paper presents a method for pre-processing data points for curve fitting in reverse engineering. The proposed method has been developed to process the measured data points before fitting into a B-spline form. The method is implemented and used for a practical application in reverse engineering. The result of the reconstruction proves the viability of the proposed method for integration with current commercial CAD systems.

Analysis of Digitizing and Traditional Measuring System at Surface Measurement of Lids

2008 ◽  
Vol 381-382 ◽  
pp. 217-220 ◽  
Author(s):  
Branimir Barisic ◽  
M. Rucki ◽  
Z. Car
Keyword(s):  
Optical Sensor ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Surface Measurement ◽  
Contact Method ◽  
Measuring Systems ◽  
Measuring Methods ◽  
Noncontact Method ◽  
Measuring Machine

The focus of this paper will be on comparison at the measurement of container lids between Advanced TOpometric Optical Sensor - ATOS III SO (GOM mbH) and traditional coordinate measuring machine CMM for the measurement of surfaces - Form Talysurf Series 2 (Taylor Hobson Ltd). In the paper, two kinds of measuring methods (noncontact method at ATOS and contact method at CMM Form Talysurf) and techniques will be made for comparison: digitizing measuring system based on the triangulation principle and traditional measuring systems based on the collecting of points from an object by touching it.

scholarly journals Modelling and optimization of a modified sequential multilateration method for three-dimensional coordinate collection

2019 ◽  
Vol 11 (11) ◽  
pp. 168781401988979
Author(s):  
Zhenjiu Zhang ◽  
Mingjun Liu ◽  
Jiaji Jiang ◽  
Linzhong Xia ◽  
Xiaomei Xu ◽  
...  
Keyword(s):  
Three Dimensional ◽  
Coordinate Measuring Machine ◽  
Test Point ◽  
Measuring System ◽  
Laser Tracker ◽  
The Monte Carlo Method ◽  
Measuring Machine ◽  
Three Dimensional Coordinate ◽  
The Mathematical Model ◽  
Modelling And Optimization

This article proposes a modified sequential multilateration method for measuring three-dimensional coordinates. The measuring system consists of a single laser tracker and four relay targets whose relative positions have been pre-calibrated by the multilateration method. The laser tracker is fixed on three prescribed positions successively, and these positions can be calibrated by using the distances between the laser tracker and the four relay targets based on the multilateration principle. Subsequently, the three-dimensional coordinates of each under-test point can be determined by the three laser trackers’ positions based on the trilateration principle. This method is more flexible than previous multilateration methods for three-dimensional coordinate collection, especially if the measurement space is partially covered by other objects. The mathematical model of this method is established. Based on the Monte Carlo method, a series of computer simulations are performed to optimize the system arrangement by investigating the performances of the measuring system with different system arrangement, and an optimal system arrangement is finally obtained. Practical measurement is also conducted to demonstrate the validity of the proposed method by comparing with a reference coordinate measuring machine.

An Improved Calibration Method for Optical 3D Measuring System Using Cross Target Based on Bundle Adjustment Algorithm

2010 ◽  
Vol 97-101 ◽  
pp. 4237-4242 ◽  
Author(s):  
Zhen Zhong Xiao ◽  
Jin Liang ◽  
De Hong Yu ◽  
Zheng Zong Tang
Keyword(s):  
Large Scale ◽  
Coordinate Measuring Machine ◽  
Calibration Method ◽  
Bundle Adjustment ◽  
Measuring System ◽  
Measurement Systems ◽  
Large Scale Field ◽  
Orientation Method ◽  
Measuring Machine ◽  
Direct Linear Transform

This paper presents an accurate calibration method of binocular 3D measurement systems for industrial on-site inspection, which uses a cross target with ring coded points. The cross target can be used to calibrate large-scale field-of-view stereo measurement systems and obtain higher measurement precision conveniently. The world coordinates of these ring coded points are not required. The calibration initial value is computed by using the relative orientation method and the Direct Linear Transform (DLT) method of photogrammetry. The bundle adjustment algorithm is used to optimize the calibration parameters as well as the 3D coordinates of the ring coded points. Experiment results show that the RMS error of the reprojection in our method is less than 0.05 pixels and the measurement error is 0.011 mm compared with the Coordinate Measuring Machine (CMM).

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