
A-78640E
Sheet
Title
Draw
No.
04 Feb.08.’03 Part of (4) is added or modified. Addition of 2.16.5
03 Jul.02.’02 A. Fukumoto Part of (3) is added or modified. T.Endo
02 May.13.’02 A. Fukumoto Addition of Tool Radius control for 5-axis machining etc T.Endo
Ed. Date Design Description
Date Jan.25.’02 Desig. A.Fukumoto Apprv. T.Endo
FANUC Series 16i /18i -TB
Specifications of AI High-Precision Contour Control /
I Nano High-Precision Contour control
117/190
Note
1. Mounting direction of the tool should be parallel to Z axis to use this
function. Therefore, this function might not be able to be applied according
to the structure of the machine.
2. The feedrate determination function that is based on cutting load uses an
NC command to determine the direction of movement along the Z–axis.
This means that the direction of movement along the Z–axis cannot be
found if the movement along the Z–axis is subject to manual intervention
with manual absolute on/off function set to on, or if the mirror image
function is used with the Z–axis. So, never use these functions when using
feedrate determination based on cutting load.
2.23.5 Ignoring F Code Commands
In a block for which the automatic feedrate control function is enabled, the
ignoring of all feed commands (F commands) can be specified by setting bit 7
(NOF) of parameter No. 8451. The feed commands are:
(1) Modal F command specified before a block for which the automatic feedrate
control function is enabled
(2) Modal F command and F command specified in a block for which the
automatic feedrate control function is enabled
Note, however, that specified F commands and modal F commands are stored in
the CNC.
This means that in a block for which the automatic feedrate control function is
disabled, a modal F command of (1) or (2) is used instead of a modal F command
calculated by the automatic feedrate control function.
2.23.6 Override to determined feedrate
The specifications of override to the feedrate determined based on a feedrate
difference along each axis or acceleration along each axis, or etc. is as follows.
· When a parameter OVR of No.8459#3 is set “0”.
Override is invalid to the deceleration function of the deceleration according
to the speed difference and the acceleration etc.
· When a parameter OVR of No.8459#3 is set “1”.
Override is effective to the deceleration function of the deceleration
according to the speed difference and the acceleration etc.
When a parameter OVR of No.8459#3 is set “1”, override becomes effective for
the following feedrate.
· Feedrate that determined based on a feedrate difference along each axis.
· Feedrate that determined based on acceleration along each axis.
· Feedrate that determined based on an allowable acceleration during circular
interpolation.
· Maximum feedrate of automatic feedrate control function.
Maximum cutting feedrate (parameter No.1422 or No.1430 or No.1432) is never
exceeded even when override is effective.
2.23.7 Other conditions of feedrate determination
If a calculated feedrate exceeds the maximum allowable feedrate for automatic
feedrate control, specified in parameter No. 8465 or with an F command, the
feedrate is clamped to the maximum allowable feedrate or F command,
whichever is smaller.