Path control apparatus for the computer directed control of a numerically controlled machine tool
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United States of America Patent
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-
Jul 22, 1980
Grant Date -
N/A
app pub date -
Dec 20, 1977
filing date -
Dec 27, 1976
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In path control apparatus for a numerically controlled machine tool, a computer determines the trajectory to be traversed in space, resolves the latter by way of interpolation into the axial increments of the individual feed axes and performs complete position control for each axis. The interpolation is accomplished by the method of direct function computation, using travel distance increments proportional to the trajectory velocity. The position control is designed as a discrete control and operates with the premise that the minimum total computing cycle time is shorter than the sampling time of the fastest position control loop required by the control system.
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