scholarly journals A Method for Simultaneously Measuring 6DOF Geometric Motion Errors of Linear and Rotary Axes Using Lasers

Sensors ◽  
2019 ◽  
Vol 19 (8) ◽  
pp. 1764 ◽  
Author(s):  
Zheng ◽  
Feng ◽  
Zhang ◽  
Li
Keyword(s):  
Measurement System ◽  
Degrees Of Freedom ◽  
High Efficiency ◽  
Single Mode ◽  
Cnc Machine Tools ◽  
Laser Source ◽  
Cnc Machine ◽  
Motion Error ◽  
Rotary Axis ◽  
Geometric Motion

A novel method for simultaneously directly measuring six-degrees-of-freedom (6DOF) geometric motion errors of CNC machine tools was proposed, and a corresponding measurement system was developed. This method can not only be applied for measuring a linear axis, but also for a rotary axis. A single-mode fiber was used to separate the measuring unit from the laser source in order to ensure system thermal stability and measurement accuracy. The method has the advantages of high efficiency and good accuracy, and requires no complicated decoupling calculation. The positioning error of the linear axis and radial motion error of the rotary axis are measured by laser interferometry and other 5DOF geometric motion errors by laser collimation. A series of experiments were performed to verify the feasibility and effectiveness of the developed measurement system.

scholarly journals Simultaneous Measurement of 6DOF Motion Errors of Linear Guides of CNC Machine Tools Using Different Modes

Sensors ◽  
2020 ◽  
Vol 20 (12) ◽  
pp. 3439
Author(s):  
Peizhi Jia ◽  
Bin Zhang ◽  
Qibo Feng ◽  
Fajia Zheng
Keyword(s):  
Machine Tools ◽  
Degrees Of Freedom ◽  
Measurement Model ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Motion Error ◽  
Actual Measurement ◽  
Measurement Models ◽  
Measurement Head ◽  
Measurement Mode

Based on the prior work on the six degrees of freedom (6DOF) motion errors measurement system for linear axes, and for the different types of machine tools and different installation methods, this study used a ray tracing idea to establish the measurement models for two different measurement modes: (1) the measurement head is fixed and the target mirror moves and (2) the target mirror is fixed and the measurement head moves. Several experiments were performed on the same linear guide using two different measurement modes. The comparative experiments show that the two measurement modes and their corresponding measurement models are correct and effective. In the actual measurement process, it is therefore possible to select the corresponding measurement model according to the measurement mode. Furthermore, the correct motion error evaluation results can be obtained.

scholarly journals Simultaneous Measurement Method and Error Analysis of Six Degrees of Freedom Motion Errors of a Rotary Axis Based on Polyhedral Prism

2021 ◽  
Vol 11 (9) ◽  
pp. 3960
Author(s):  
Dong Ma ◽  
Jiakun Li ◽  
Qibo Feng ◽  
Qixin He ◽  
Yaowen Ding ◽  
...  
Keyword(s):  
Degrees Of Freedom ◽  
Motion Error ◽  
Six Degrees Of Freedom ◽  
Rotary Axis ◽  
Position Errors ◽  
Manufacturing Errors ◽  
Polyhedral Prism ◽  
Novel Method ◽  
Six Dof ◽  
Geometric Motion

A novel method is proposed for measuring the six degrees-of-freedom (DOF) geometric motion errors of a rotary axis based on a polyhedral prism. An error-sensitive unit which consists of a polyhedral prism and a planar reflector, is designed to carry out measurement of all six DOF errors, including the angular positioning error, the tilt motion error around the Y axis, the tilt motion error around the X axis, the radial motion error along the X and Y axes, and the axial motion error along the Z axis. The mathematical error model, including the six DOF geometric motion errors of the rotary axis, the installation errors between the polyhedral prism and the rotary axis, the manufacturing errors of the polyhedral prism, and the position errors of the sensors, are established. The effectiveness of the proposed method and the compensation model was simulated and experimentally verified.

Measurement Method for Measuring Circular Motion Error of CNC Machine Tools

2008 ◽  
Vol 381-382 ◽  
pp. 145-148
Author(s):  
K.H. Lin ◽  
Ya Hui Hu ◽  
C.A. Chan ◽  
Ming Chang
Keyword(s):  
Measurement System ◽  
Machine Tools ◽  
Measurement Method ◽  
Circular Motion ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Small Scale ◽  
Large Radius ◽  
Cnc Machine ◽  
Motion Error

The dynamic characteristic of CNC (computer numerical control) machine tools is a critical role to decide the accuracy and speed of machine. It is very important to improve the precision and reduce the motion error so as to manufacture complex and fine products. In general, the motion error is estimated by a two or three-dimensional ball bar measurement system. Although this technology is capable of dynamical measurement, its condition should be confined to a low speed or a large radius. A new measurement method for measuring circular motion error of CNC machine tools is proposed in this paper. The instrument consists of a dual-frequency laser interferometer, a beam splitter and two corner cubes. In order to evaluate the exactness of the results we get from our measurement system, we use RSF’s grid encoder to do another experiment and compare both the results. According to the results shown, our measurement system can measure both of the X and Y axes of the plane of the CNC stage in a small scale at the same time and can simplify the calibration procedure as well as shorten the time of measurement. This method can accomplish the two-axis measurement at a high speed, without being restricted by radius variations. It is a good, simple and effective measurement method.

scholarly journals Simultaneous Measurement Method and Error Analysis of the Six Degrees-of-Freedom Motion Errors of a Rotary Axis

2018 ◽  
Vol 8 (11) ◽  
pp. 2232 ◽  
Author(s):  
Chuanchen Bao ◽  
Qibo Feng ◽  
Jiakun Li
Keyword(s):  
Simultaneous Measurement ◽  
Error Compensation ◽  
Degrees Of Freedom ◽  
Translational Motion ◽  
Laser Interferometry ◽  
Positioning Error ◽  
Motion Error ◽  
Measuring Device ◽  
Six Degrees Of Freedom ◽  
Rotary Axis

Error measurement of a rotary axis is the key to error compensation and to improving motion accuracy. However, only a few instruments can measure all the motion errors of a rotary axis. In this paper, a device based on laser collimation and laser interferometry was introduced for simultaneous measurement of all six degrees-of-freedom motion errors of a rotary axis. Synchronous rotation of the target and reference rotary axes was achieved by developing a proportional–integral–derivative algorithm. An error model for the measuring device was established using a homogeneous transformation matrix. The influences of installation errors, manufacturing errors, and error crosstalk were studied in detail, and compensation methods for them were proposed. After compensation, the repeatability of axial and radial motion errors was significantly improved. The repeatability values of angular positioning error and of tilt motion error around the y axis and x axis were 28.0″, 2.8″, and 3.9″. The repeatability values of translational motion errors were less than 2.8 μm. The comparison experiments show that the comparison errors of angular positioning error and tilt motion error around the y axis were 2.3″ and 2.9″, respectively. These results demonstrate the effectiveness of our method and the error compensation model.

scholarly journals Rapid Measurement and Identification Method for the Geometric Errors of CNC Machine Tools

2019 ◽  
Vol 9 (13) ◽  
pp. 2701 ◽  
Author(s):  
Li ◽  
Yang ◽  
Gao ◽  
Su ◽  
Wei ◽  
...  
Keyword(s):  
Error Compensation ◽  
Machine Tools ◽  
Degrees Of Freedom ◽  
Cnc Machine Tools ◽  
Geometric Errors ◽  
Two Dimensional ◽  
Cnc Machine ◽  
Angle Sensor ◽  
Identification Method ◽  
Measuring Machine

Error compensation technology offers a significant means for improving the geometric accuracy of CNC machine tools (MTs) as well as extending their service life. Measurement and identification are important prerequisites for error compensation. In this study, a measurement system, mainly composed of a self-developed micro-angle sensor and an L-shape standard piece, is proposed. Meanwhile, a stepwise identification method, based on an integrated error model, is established. In one measurement, four degrees-of-freedom errors, including two-dimensional displacement and two-dimensional angle of a linear guideway, can be obtained. Furthermore, in accordance with the stepwise identification method, the L-shape standard piece is placed in three different planes, so that the measurement and identification of all 21 geometric errors can be implemented. An experiment is carried out on a coordinate measuring machine (CMM) to verify the system. The residual error of the angle error, translation error and squareness error are 1.5″, 2 μm and 3.37″, respectively, and these are compared to the values detected by a Renishaw laser interferometer.

Control of Machine Tools and Robots

1986 ◽  
Vol 39 (9) ◽  
pp. 1331-1338 ◽  
Author(s):  
Yoram Koren
Keyword(s):  
Machine Tools ◽  
Degrees Of Freedom ◽  
Feedback Loop ◽  
Control Structure ◽  
Industrial Robots ◽  
Cnc Machine Tools ◽  
Cnc Machine ◽  
Control Schemes ◽  
Position Feedback ◽  
Recent Developments

The principal control structure of CNC machine tools and industrial robots is similar, since in both systems each axis of motion is separately controlled with a position feedback loop. Nevertheless, the control of robots is more complex, since they include more degrees of freedom and the motion of each joint is not independent of other joints. This paper compares the conventional control schemes of both systems, and summarizes recent developments in adaptive control of machine tools and robots.

The Study on 5-DOF CNC Machine Tool Motion

2014 ◽  
Vol 494-495 ◽  
pp. 448-451
Author(s):  
Jia Zheng Wei
Keyword(s):  
Machine Tool ◽  
Trajectory Planning ◽  
Machine Tools ◽  
Cnc Machine Tools ◽  
Cnc Machine Tool ◽  
Cnc Machine ◽  
Motion Error ◽  
Tool Motion ◽  
Error Motion

The 5-DOF CNC machine tools motion error, motion space simulation and interference are analyzed. The tool machine dynamic and static interference, trajectory planning are discussed, which realizes the parts manufacturability and processing rationality.

Engraving and Milling Machine Design Based on Open CNC System

2011 ◽  
Vol 52-54 ◽  
pp. 881-886
Author(s):  
Shu Kun Cao ◽  
Zhi Ming Sui ◽  
Lu Ning Liu ◽  
Gui Cong Wang ◽  
Wei Wei Song
Keyword(s):  
High Efficiency ◽  
Design Method ◽  
Three Dimensional ◽  
Numerical Control ◽  
Cnc Machine Tools ◽  
Milling Machine ◽  
Cnc Machine ◽  
Cnc System ◽  
Open Cnc ◽  
Open Cnc System

In view of application requirements, control axes, the development cycle and other factors of open CNC machine tools, we consider the modular as the guiding ideology and propose a design method of three-dimensional engraving and milling machine based on open CNC system. In this paper we make a detailed design for mechanism structure and control system. Experiments show that this machine has milling and engraving capabilities, can process metal and non-metallic parts, which is a high efficiency, multi-function numerical control equipment.

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