Why High Inertia Dc Servos are Supplanting Hydraulic Drives on Machine Tool Slides

  • Roger Gettys Hill


The latest thing in machine tool control is, of all things, a high inertia d.c. motor. Once considered an anathema to servo engineers, high inertia is proving to be very desirable when associated with the drives applied to machine tool slides. High inertia motors provide the necessary torque without gears. They assure a servo stability that makes high velocity loop gains easy to obtain, and they have the inherent ruggedness necessary for reliable performance. Remarkably it took twenty years to find this out. A short review of the history of the development of machine tool slide drives will make this quite clear.


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  1. 1.
    GEORGE YOUNKIN (1969). Comparing machine tool feed drives, June. 33rd Annual Westinghouse forum.Google Scholar
  2. 2.
    B. T. ANDERSON and D. G. FAIR (1966). The Sundstrand SCR servo drive, IEEE machine tool conference, October.Google Scholar
  3. 3.
    H. E. MERRITT (1969). Cincinnati milacron; hydraulic component analysis, University of Cincinnati, machine tool controls seminar, September.Google Scholar
  4. 4.
    G. S. ALBERS (1968). Lodge & Shipley Company; Stability analysis of N/C servos, IEEE machine tool conference, October.Google Scholar

Copyright information

© Macmillan Publishers Limited 1974

Authors and Affiliations

  • Roger Gettys Hill
    • 1
  1. 1.President Gettys Manufacturing Co.Inc. RacineRacineUSA

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