
7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL B-63943EN-1/02
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7.3 JERK CONTROL
7.3.1 Speed Control with Change of Acceleration on Each Axis
Overview
In portions in which acceleration changes largely, such as a portion
where a programmed figure changes from a straight line to curve,
vibration or shock on the machine may occur. Speed control with
change of acceleration on each axis is a function to suppress
machining errors due to vibration and machine shock generated by
change of acceleration. This function obtains a feedrate so that
change of acceleration is within the parameter-set permissible accel-
eration change amount for each axis, and performs deceleration by
using acceleration/deceleration before interpolation.
CAUTION
Before speed control with change of acceleration on
each axis can be used, the options for jerk control
and AI contour control (named temporarily) are
required.
Explanation
In the following example, the Y-axis acceleration changes largely at
the contact point between a linear interpolation and circular interpo-
lation, so deceleration is performed.
From linear interpolation (N1) to circular interpolation (N2)
Y
X
Vibration due to change
of acceleration
N1
N2
Tangential
feedrate
Y-axis
acceleration
Feedrate
Time
N1
N2
Time
Feedrate
cceleration
Time
cceleration
Time