scholarly journals Analysis of Motion Errors of Linear Guide Pair Based on Parallel Mechanism

Machines ◽  
2021 ◽  
Vol 9 (2) ◽  
pp. 33
Author(s):  
Peng-Hao Hu ◽  
Ying-Jun Lei ◽  
Yang-Kai Ou
Keyword(s):  
Parallel Mechanism ◽  
Coordinate Measuring Machine ◽  
Guide Rail ◽  
Motion Error ◽  
Linear Guide ◽  
Measuring Machine ◽  
Moving Platform ◽  
Straightness Error ◽  
The Relationship ◽  
Analysis Of Motion

This paper systematically summarized the technical state of art and research results on the motion error of a linear guideway, corrected some misconceptions, and further clarified the relationship between the straightness error of the guide rail itself and the motion error of the linear stage. Moreover, a new method based on parallel mechanism is provided to study the motion errors of the linear guide pair. The basic idea is to abstract the structural relationship between the stage and the guide rail into a 4-bar parallel mechanism. Thus, the stage can be considered as a moving platform in the parallel mechanism. Its motion error analysis is also transferred to moving platform position analysis in the parallel mechanism. The straightness motion error and angular motion error of the stage can be analyzed simultaneously by using the theory of parallel mechanism. Some experiments were conducted on the linear guideway of a self-developed parallel coordinate measuring machine. The experimental data and analysis verify the feasibility and correctness of this method.

Online Measurement Experiment and Data Analysis of the Slideway Straightness Motion Error for CMM

2014 ◽  
Vol 529 ◽  
pp. 329-333
Author(s):  
Fei Fei Wang ◽  
Wei Ming He
Keyword(s):  
Data Analysis ◽  
Coordinate Measuring Machine ◽  
Least Square Method ◽  
Least Square ◽  
Online Measurement ◽  
Motion Error ◽  
Means Of Measurement ◽  
Measurement Experiment ◽  
Measuring Machine ◽  
Straightness Error

The paper introduces the principle of the sequential two points (STP) method, using the error separation technique to isolate slideway straightness error and workpiece straightness error, by means of measurement and data analysis to study the slideway straightness error. Using least square method for fitting to improve the accuracy of three coordinate measuring machine. Last to assess and maintain the accuracy of the measurement machine.

Automatic straightness measurement of a linear guide using a real-time straightness self-compensating scanning stage

2009 ◽  
Vol 223 (9) ◽  
pp. 1171-1179 ◽  
Author(s):  
C H Liu ◽  
Y-R Jeng ◽  
W Y Jywe ◽  
S-Y Deng ◽  
T-H Hsu
Keyword(s):  
Real Time ◽  
Eddy Current ◽  
Coordinate Measuring Machine ◽  
Measuring System ◽  
Current Sensor ◽  
Linear Guide ◽  
Eddy Current Sensor ◽  
Measuring Machine ◽  
Set Up ◽  
Straightness Error

In this paper a method is developed for straightness measurement of a linear guide by using a straightness self-compensating stage with an optical straightness measuring system, an eddy current sensor, and a cross-roller type compensation stage. Both the compensation stage and the optical straightness system were set up on a scanning stage to measure the straightness error of the scanning stage. The measured straightness error was fed back to the control system to compensate directly in real time. Thus, straightness of a linear guide without the added straightness error of the scanning stage could be measured. The Hewlett Packard laser straightness calibration system was used to verify the real-time compensated results. Straightness error of the scanning stage was compensated from the worst straightness error of 20 μm/150 mm to 0.9 μm/150 mm. The eddy current sensor measured straightness of the linear guide and the measured result matched the result obtained by the coordinate measuring machine.

scholarly journals Influence of measuring force on CMM accuracy

2018 ◽  
Vol 208 ◽  
pp. 03004
Author(s):  
Bin Wang
Keyword(s):  
Cross Sections ◽  
Measurement Accuracy ◽  
Coordinate Measuring Machine ◽  
Point Of View ◽  
Signal Acquisition ◽  
Force Model ◽  
Thin Part ◽  
Measuring Machine ◽  
The Relationship ◽  
Measuring Force

The measuring accuracy of CMM (Coordinate Measuring Machine) is influenced by many factors, such as temperature, humidity, measuring force and method of signal acquisition. For thin parts, the influence of measuring force is especially obvious. In this paper, the relationship between measuring force and measurement accuracy is studied for a thin part with a U-shaped cross-section. By analyzing the structure of the probe and establishing the force model, the influencing factors of the accuracy of CMM are obtained, and the influence of the contact deformation and the bending deformation on the measurement accuracy is analyzed from the point of view of material mechanics. At the same time, the measurement accuracy of different measuring cross-sections is analyzed. Through the research of this paper, the relationship between measuring force and CMM is established, and an effective method to improve the accuracy of CMM is also found.

Modeling and Simulation of the Engraving Process in Different Life Stages of Small Caliber Guns

2022 ◽  
Author(s):  
Mohamed Dhouibi ◽  
Hamza Ousji ◽  
Oussama Atoui ◽  
Rachid Nasri ◽  
Marc Pirlot
Keyword(s):  
Doppler Radar ◽  
Experimental Studies ◽  
Coordinate Measuring Machine ◽  
Life Stages ◽  
Resistance Evolution ◽  
Chamber Volume ◽  
Gun Barrel ◽  
Measuring Machine ◽  
Bullet Velocity ◽  
The Relationship

Abstract Effects of erosion phenomenon on the performance of a given gun barrel have been analyzed throughout numerical and experimental studies. Mainly, qualitative observations were performed. Theoretical relations between the evolution of the inner barrel profile and the provided interior ballistics are limited. This paper focuses on the development of a numerical model to predict the engraving resistance evolution in terms of the inner barrel profile in the different weapon's life stages. Four test barrels "12.7x99mm NATO" with different chamber volumes were considered. First, a Coordinate Measuring Machine (CMM) with a contact scanning probe was used to measure the inner dimension of the guns. Second, piezoelectric sensors with a special doppler radar were considered to measure the (i) pressure and (ii) the bullet velocity in the test weapons. Finally, based on the obtained experimental results, a Finite Element (FE) analysis using the commercial software LS-DYNA was developed and validated. The obtained numerical results were used as insights to quantify the relationship between the engraving resistance and the chamber volume of small caliber guns.

A Multi-Probe Measurement Method to Evaluate the Yaw and Straightness Errors of XY Stage on High Precision CMM

2010 ◽  
Vol 447-448 ◽  
pp. 590-594 ◽  
Author(s):  
Ping Yang ◽  
Shusaku Shibata ◽  
Satoru Takahashi ◽  
Kiyoshi Takamasu ◽  
Osamu Sato ◽  
...  
Keyword(s):  
High Precision ◽  
Coordinate Measuring Machine ◽  
Simultaneous Equation ◽  
High Accuracy ◽  
Probe Measurement ◽  
Probe Method ◽  
Measuring Machine ◽  
Simulation Results ◽  
Straightness Error ◽  
Laser Interferometers

To develop a high precision Micro Coordinate Measuring Machine (Micro-CMM), it is important to evaluate an X-Y stage on the Micro-CMM. A precision multi-probe measurement system has been designed and developed for simultaneously measuring the yaw and straightness errors of the X-Y stage. In the system, an autocollimator measures the yaw error of the stage, and two laser interferometers measure the profile of a standard mirror which is fixed on the X-Y stage. The straightness error is reconstructed by the application of simultaneous equation and least-squares methods, and the uncertainty associated with the multi-probe method is simulated. When the interval of the laser interferometers equals 10 mm, the standard deviation of multi-probe method using the high accuracy autocollimator and the laser interferometers is about 10 nm. The simulation results satisfy our purpose for the uncertainty of 50 nm, and practical considerations are discussed.

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.

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