
PROGRAMMING22. RISC PROCESSOR
B–63534EN/02
620
Usually, the cutting resistance is higher when machining is performed
with the bottom of the cutter, as shown in Fig. 22.1.2 (c) an when
machining is performed with the side of the cutter, as shown in Fig. 22.1.2
(d). Deceleration is, therefore, required. In AI High Precision Countour
Control, the tool travel direction on the Z–axis is used as a condition for
calculating the machining feedrate.
The descent angle during descent on the Z–axis (angle formed by the XY
plane and the tool center path) is as shown in Fig. 22.1.2 (d). The descent
angle is divided into four areas, and the override values for the individual
areas are set for the following parameters:
Parameter No. 8456 for area 2
Parameter No. 8457 for area 3
Parameter No. 8458 for area 4
For area 1, however, no parameter is available, and an override of 100%
is used at all times. The feedrate obtained according to other feedrate
control is multiplied by the override value of the area to which descent
angle belongs.
Area1 0°v q <30°
Area2 30°v q <45°
Area3 45°v q <60°
Area4 60°v q v90°
30°
45°
XY plane
Z
60°
90°
Area1
Area2
Area3
Area4