
7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL B-63783EN-1/01
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7.1.14.1 Smooth Velocity Control
Overview
Smooth velocity control is a function that performs smooth velocity
determination by recognizing the overall figure from the multiple
preceding and succeeding blocks containing look-ahead in velocity
determination with acceleration in fine HPCC mode.
If a curved figure is specified with consecutive minute straight lines,
the machining program is rounded in the least input increment before
being executed, so that the machining profile is approximated with
lines.
In regular velocity determination with acceleration, an optimum velocy
is automatically calculated faithfully for the program-specified figure.
Depending on the specification, therefore, the acceleration may
increase, possibly causing deceleration to be performed.
If, in such a case, smooth velocity control is used, velocity control is
performed by recognizing the overall figure, thereby enabling smooth
velocity control while suppressing local deceleration, and improving
velocity control.
Explanation
Large acceleration
: Program-specified path
: Figure as recognized
Even for those portions of a program-specified figure for which the
acceleration may increase, the acceleration is determined on the basis
of the figure as recognized from multiple blocks, and velocity
determination is performed so that the acceleration does not exceed the
permissible velocity set with parameter No. 1663
Regular deceleration with acceleration
Smooth velocity control
Tangent velocity
Time
Command with large acceleration