
B-63782EN/01 NC FUNCTIONS 19.FUNCTIONS FOR HIGH-SPEED CUTTING
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19.8 JERK CONTROL
Look-ahead acceleration/deceleration before interpolation and fine
HPCC, which are high-speed, high-precision machine functions,
perform speed control in such a way that the rate of change of
acceleration (jerk) will be smooth.
As a result, vibration and shocks on the machine are reduced, leading to
machining at higher precision.
There are two types of jerk control functions as described below.
<1> Speed control based on changes to acceleration for each axis
Speed control for portions where there is a large change to
acceleration, for example, a portion where a specified shape
changes from a straight line to a curved line, is performed using
look-ahead acceleration/deceleration before interpolation by
obtaining a feed rate that can keep a change to acceleration for
each axis from exceeding their permissible acceleration change
level.
As a result, vibration in a servo section where there can be a large
change to acceleration is suppressed, leading to an improved
precision for cut surfaces.
<2> Look-ahead smooth bell-shaped acceleration/deceleration before
interpolation
Look-ahead bell-shaped acceleration/deceleration before
interpolation performs control in such a way that tangential
changes to acceleration in the acceleration change time will be
smooth.
As a result, ordinary bell-shaped acceleration/deceleration can
become smoother, leading to a reduction in shocks to the machine
at acceleration/deceleration.
If the bell-shaped acceleration/deceleration is specified as an
acceleration/deceleration type for the following functions
performed in acceleration/deceleration before interpolation, the
same effect as stated above can be achieved because this function
makes changes to acceleration smoother.
- Acceleration/deceleration before interpolation for linear
rapid traverse
- Optimum-torque acceleration/deceleration