
7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL B-63783EN-1/01
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(3) Advanced feed-forward function
(4) Nano interpolation
With the fine HPCC function, the additional functions listed below can
be used to achieve high-speed, high-precision machining for very small
straight lines and NURBS curved lines:
(1) Feedrate determination based on acceleration on each axis
(2) Deceleration function based on Z-axis fall angle
(3) Fifteen-block multi-buffer function
(The number of blocks can be optionally increased to a maximum
of 100 blocks.)
Automatic feedrate control function
In fine HPCC mode, the feedrate is automatically controlled by the
reading-ahead of blocks.
The feedrate is determined using the following conditions. If the
specified feedrate exceeds the determined feedrate, acceleration/
deceleration before interpolation is performed to achieve the
determined feedrate.
(1) Feedrate changes on each axis at a corner and the permissible
feedrate change that has been set
(2) Expected acceleration on each axis and the permissible
acceleration that has been set
(3) Cutting load that is expected from the travel direction on the Z-
axis
Specified tool path
Tool path assumed when
fine HPCC is not used
Tool path assumed when
fine HPCC is used
The machining error is decreased
because of deceleration with the
acceleration.
The machining error is decreased
because of the deceleration by
difference in feedrate.
Fig. 7.1.14 (a)
To enable this function, set the desired values for the following
parameters:
Parameter No. 1478:
Permissible feedrate difference used when the feedrate is to be
determined from the feedrate difference at a corner
Parameter No. 1663:
Permissible acceleration when the feedrate is to be determined
from the acceleration
For details, see the explanation of these parameters.