Fanuc Series 15i/150i-MA (Programming) Operators Manual

B-63324EN/03 PROGRAMMING 18.HIGH-SPEED CUTTING FUNCTICNS
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18.5 FINE HPCC (G05.1)
This function is designed to achieve high-speed, high-precision
machining with a program involving a sequence of very small straight
lines and NURBS curved lines, like those used for metal die machining.
This function can suppress the servo system delay and delay caused by
acceleration/deceleration that increase as a higher feedrate is used.
Format
Thus, this function can be used to ensure that the tool strictly traces the
specified values, thus minimizing machining profile errors for higher-
speed, higher-precision machining.
G05.1 Q1 :
Look-ahead acceleration/deceleration before interpolation
mode on (Multi-buffer mode is set at the same time.)
G05.1 Q0 :
Look-ahead acceleration/deceleration before interpolation
mode off (Multi-buffer mode remains set.)
G05.1 P1 Q0 :
Look-ahead acceleration/deceleration before interpolation
mode off (Multi-buffer mode is cleared.)
Specify G05.1 alone in a block.
By setting bit 6 (MBF) of parameter No. 2401, the look-
ahead acceleration/deceleration before interpolation
mode is set can also be turned on automatically upon
power-up or a reset.
Fine HPCC mode can be turned on and off by
G05P10000 and G05P0, which specify the application of
high precision contour control by the 64-bit RISC
processor of the FANUC Series 15-MB. For details, see
"Specifying G05P10000/G05P0," below.
Explanation
- Functions enabled
In fine HPCC mode, the look-ahead acceleration/deceleration before
interpolation function becomes effective. Therefore, the following
functions are enabled:
1) Linear acceleration/deceleration before interpolation or bell-
shaped acceleration/deceleration before interpolation
2) Deceleration function based on feedrate differences at corners
3) Advanced feed-forward function
4) Nano interpolation

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