Analysis of Transients in an Adaptive Control Servomechanism for Milling With Constant Force

[+] Author and Article Information
J. Tlusty, M. A. A. Elbestawi

Mechanical Engineering Department, McMaster University, Hamilton, Ontario, Canada

J. Eng. Ind 99(3), 766-772 (Aug 01, 1977) (7 pages) doi:10.1115/1.3439311 History: Received July 21, 1976; Online July 15, 2010


Characteristics of a reasonably well-adjusted NC servo are given as measured as well as modeled. A model of an A/C loop is added and investigated for stability and for a transient in meeting a sudden increase of depth of cut. Both the classical approach and a numerical simulation (state-space approach) are used. The important effect on stability is shown of a time delay between table velocity change and cutting force change, which is due to the interval between the action of individual cutter teeth. The beneficial effect of a rate feedback on stability is demonstrated.

Copyright © 1977 by ASME
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