
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
116/190
2.23.4 Feedrate Determination Based on Cutting Load
This function can be used when bit 4 (ZAG) of parameter No. 8451 is set to 1.
θ
Cutting the workpiece with the end of the cutter (Fig. 2.23.5 (b)) incurs a greater
resistance than when cutting the workpiece with the side of the cutter (Fig.
2.23.5 (a)). Therefore, for (Fig. 2.23.5 (b)), the tool must be decelerated. To
calculate the required degree of feedrate deceleration, the automatic feedrate
control function uses the angle of downward movement of the tool along the Z–
axis.
When the tool is moving down along the Z–axis, the angle (θ) of downward
movement formed by the XY plane and cutter path is as shown in the Fig. 2.23.5
(b). The angle of downward movement is divided into four areas, with an
override value for each area specified in a parameter, as follows:
Area 2: Parameter No. 8456
Area 3: Parameter No. 8457
Area 4: Parameter No. 8458
No override parameter is provided for area 1; the override value for area 1 is
always 100%. A feedrate determined with a separate feedrate control function is
multiplied by the override value specified for the area to which the angle
θ of
downward movement belongs.
Area 1: 0
°≤θ<30°
Area 2: 30°≤θ<45°
Area 3: 45°≤θ<60°
Area 4: 60°≤θ≤90°
XY plane
Z
30°
45°
60°
90°
rea 1
rea 2
rea 3
rea 4
Fig. 2.23.5 (a) When the tool is moving up
alon
the Z–axis
Fig. 2.23.5 (b) When the tool is moving
down alon
the Z–axis