scholarly journals Error Averaging Effect in Parallel Mechanism Coordinate Measuring Machine

2016 ◽  
Vol 6 (12) ◽  
pp. 383 ◽  
Author(s):  
Peng-Hao Hu ◽  
Chang-Wei Yu ◽  
Kuang-Chao Fan ◽  
Xue-Ming Dang ◽  
Rui-Jun Li
Keyword(s):  
Parallel Mechanism ◽  
Coordinate Measuring Machine ◽  
Measuring Machine ◽  
Error Averaging

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 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.

scholarly journals Calibration Method of Parallel Mechanism Type Machine Tools

2020 ◽  
Vol 14 (3) ◽  
pp. 429-437
Author(s):  
Keisuke Nagao ◽  
◽  
Nobuaki Fujiki ◽  
Yoshitaka Morimoto ◽  
Akio Hayashi
Keyword(s):  
Machine Tools ◽  
Parallel Mechanism ◽  
Least Squares Method ◽  
Coordinate Measuring Machine ◽  
Calibration Method ◽  
Kinematic Parameter ◽  
Forward Kinematics ◽  
Kinematic Parameters ◽  
Type Machine ◽  
Measuring Machine

This paper proposes a calibration method for a parallel mechanism type machine tool (XMINI, Exechon Enterprises L.L.C.). In this method, the kinematic parameters are calculated using forward kinematics and the least squares method from the results obtained by a coordinate measuring machine. By using an articulated arm coordinate measuring machine (AACMM), we can measure a wide space, and the measuring machine position do not have to be determined strictly. This paper provides a solution for the forward kinematics problem to identify the kinematic parameters. The results from the kinematic parameter calculation are evaluated using the experimental results from an actual machine.

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