Scheduled System Maintenance:
On Monday, April 27th, IEEE Xplore will undergo scheduled maintenance from 1:00 PM - 3:00 PM ET (17:00 - 19:00 UTC). No interruption in service is anticipated.
By Topic

Backlash Detection in CNC Machines Based on Experimental Vibration Analysis

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$31 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Moosavian, S.A.A. ; Dept. of Mech. Eng., K.N. Toosi Univ. of Technol., Tehran ; Mohammadiasl, E.

Exploiting backlash free mechanisms and gearboxes, the stiffness of servo axes in CNC machines can be improved. In fact, the rigidity of these axes will be increased, so that different types of feedforward control can be implemented. Furthermore, backlash free mechanisms facilitate designing foolproof systems without challenging with the instability and nonlinear behavior of backlash. However, any mechanical failure and looseness causes backlash which in turn may lead to severe vibrations. So, backlash detection and exploiting efficient preventive maintenance (PM) to prevent interrupt in the production line is of interest. In this paper, first a simple model for mechanical system of a CNC servo axis, and its control system will be presented. This reduced order system for speed control will be detailed. Next, the bandwidth of vibration frequencies due to backlash is estimated and behavior of a servo axis with various backlashes is simulated. Then, to encapsulate the role of backlash in different conditions, performance response of five mechanically different axes with different servo gains in various CNC machines are empirically investigated. These experimental frequencies of vibration obtained in completely different CNC machines (small, medium and heavy size) are compared with those estimated. Simulation and experimental results show that the frequency of vibration in a servo axis with backlash is not affected by the value of backlash, while the position control gain dictates this frequency. Finally, an experimental equation will be developed that estimates this frequency for various CNC machines.

Published in:

Robotics, Automation and Mechatronics, 2008 IEEE Conference on

Date of Conference:

21-24 Sept. 2008