
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
132/190
2.25.2 Speed control based on changes to acceleration for each axis
• Outline
Vibration or shocks may occur to the machine in portions where there is a large
change to acceleration, for example, a portion where the shape specified by the
machining program changes from a straight line to a curved line.
To reduce machining error that may result from vibration or shocks to the
machine when the acceleration changes, speed control based on changes to
acceleration for each axis reduces the tool speed at acceleration/deceleration
before interpolation by obtaining a feed rate that can keep acceleration changes
from exceeding the permissible acceleration change level set in parameters for
each axis.
• Example
The following example performs deceleration at a point of tangency between
linear interpolation and circular interpolation because there is a large changes to
acceleration along the Y-axis.
Linear interpolation (N1) → circular interpolation (N2)
Y
X
Vibration due to changes to
acceleration
N1
N2
Tangential
speed
Y-axis
acceleration
Speed
Time
N1
N2
Time
Speed
cceleration
Time
cceleration
Time