
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
131/190
2.25 Jerk Control
2.25.1 Outline
To use this function, 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
This function is an additional option.