
B-63783EN-1/01 7.FEEDRATE CONTROL/ACCELERATION AND DECELERATION CONTROL
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7.2.2 Look-ahead Acceleration/Deceleration Before interpolation
General
When acceleration/deceleration after interpolation is used,
acceleration/deceleration is applied to the interpolated data.
Consequently, the interpolated data is changed by acceleration/
deceleration. When acceleration/deceleration before interpolation is
used, however, acceleration/deceleration is applied to the feedrate data
before interpolation. Consequently, the interpolated data is not
changed by acceleration/deceleration. Accordingly, interpolation data
ensures that machining follows a specified line or curve at all times,
thus eliminating the machining profile errors that result from delays in
acceleration/deceleration.
High-precision machining using continuous minute line segments or
NURBS curve commands, such as metal die machining, additionally
requires the use of the fine HPCC function.
Format
G05.1 Q1 : Look-ahead acceleration/deceleration
before interpolation mode on
(The multi-buffer mode is also set to on.)
G05.1 Q0 : Look-ahead acceleration/deceleration
before interpolation mode off
(Multi-buffer mode is kept on.)
G05.1 P1 Q0 : Look-ahead acceleration/deceleration
before interpolation mode off
(Multi-buffer mode is set off.)
Specify only G05.1 in a single block.
Look-ahead acceleration/deceleration before
interpolation mode can be automatically turned on at
power-up and upon a reset if the MBF bit (bit 6 of
parameter 2401) is specified accordingly.
Explanation
Valid functions
In look-ahead acceleration/deceleration before interpolation mode, the
following functions are valid:
(1) Linear acceleration/deceleration before interpolation or bell-
shaped acceleration/deceleration before interpolation
(2) Deceleration based on a feedrate difference at a corner
(3) Advance feed forward
(4) Nano interpolation
- Fine high-precision contour control (fine HPCC)
If the fine HPCC function is provided, fine HPCC mode is turned on
when the CNC enters the look-ahead acceleration/deceleration before
interpolation mode.