Geometric error modeling and compensation of horizontal CNC turning center for TI worm turning

This paper shows the most common rotor systems which can be used to analyse a CNC turning center. Starting with the simplest rotor system representation (single-degree-offreedom) up to analysing multi-degree-of-freedom and infinite-degree-of-freedom rotor systems using the TMM (Transfer Matrix Method) when it comes to cases like multi desk rotors and Jeffcott-rotors.

Download Full-text

Improving the Accuracy of Multi-Axis Machines Through On-Line Error Compensation Using Neural Networks

Volume 2: 24th Design Automation Conference ◽

10.1115/detc98/dac-5641 ◽

1998 ◽

Author(s):

Abderrazak El Ouafi ◽

Michel Guillot ◽

Abdellah Bedrouni

Keyword(s):

Error Compensation ◽

Error Modeling ◽

Precision Engineering ◽

Dimensional Error ◽

New Approach ◽

Turning Center ◽

On Line ◽

Dynamic Errors ◽

Compensation Approach ◽

Compensation Function

Abstract This research is devoted to one of the most fundamental problems in precision engineering: multi-axis machines accuracy. The paper presents a new approach designed to support the implementation of software error compensation of geometric, thermal and dynamic errors for enhancing the accuracy of multi-axis machines. The accuracy of multi-axis machines can be significantly improved using an intelligent integration of sensor information to perform the compensation function. The compensation process consists of the following major steps carried out on-line: continuous monitoring of the machine conditions using position, force, speed and temperature sensors mounted on the machine structure. Error forecasting through sensor fusion. Volumetric error synthesis and software compensation. To improve the effectiveness of error modeling, an artificial neural network is extensively applied. Implemented on a turning center, the compensation approach has enabled improvement of the machine accuracy by reducing the maximum dimensional error from 70 μm initially to less than 4 μm.

Download Full-text

Criticality Analysis of CNC Turning Center Using Analytic Hierarchy Process

Lecture Notes in Mechanical Engineering - Reliability and Risk Assessment in Engineering ◽

10.1007/978-981-15-3746-2_6 ◽

2020 ◽

pp. 61-76

Author(s):

Rajkumar Bhimgonda Patil ◽

Basavraj S. Kothavale

Keyword(s):

Analytic Hierarchy Process ◽

Analytic Hierarchy ◽

Cnc Turning ◽

Turning Center ◽

Criticality Analysis ◽

Hierarchy Process

Download Full-text

A General Approach for Geometric Error Modeling of Lower Mobility Parallel Manipulators

Journal of Mechanisms and Robotics ◽

10.1115/1.4003845 ◽

2011 ◽

Vol 3 (2) ◽

Cited By ~ 29

Author(s):

Haitao Liu ◽

Tian Huang ◽

Derek G. Chetwynd

Keyword(s):

Systematic Approach ◽

Parallel Manipulators ◽

Geometric Error ◽

Error Modeling ◽

Kinematic Calibration ◽

Accuracy Improvement ◽

Linear Map ◽

Homogeneous Transformation Matrix ◽

Lower Mobility ◽

Source Errors

This paper presents a general and systematic approach for geometric error modeling of lower mobility manipulators. The approach can be implemented in three steps: (1) development of a linear map between the pose error twist and source errors within an individual limb using the homogeneous transformation matrix method; (2) formulation of a linear map between the pose error twist and the joint error intensities of a lower mobility parallel manipulator; and (3) combination of these two models. The merit of this approach lies in that it enables the source errors affecting the compensatable and uncompensatable pose accuracy of the platform to be explicitly separated, thereby providing designers and/or field engineers with an informative guideline for the accuracy improvement achievable by suitable measures, i.e., component tolerancing in design, manufacturing and assembly processes, and kinematic calibration. Three typical and well-known parallel manipulators are taken as examples to illustrate the generality and effectiveness of this approach.

Download Full-text