上海维宏电子科技股份有限公司
Weihong Electronic Technology Co., Ltd.
Specialized, Concentrated, Focused 31
Y25. ’hole 3
G98 X5. ’hole 4, and setting to return to the initial point
X10. Y10. Z-20. ’hole 5, and setting a new point Z as -20
G80
M05 ’drill stop
M02
G74 Left Tapping Cycle
Command Format: G74 X_Y_Z_R_P_F_K_;
Description:
X_Y_: hole position data (absolute/incremental coordinate)
Z_: the position of point Z at the bottom of hole (absolute programming); the distance from point
R to point Z at the bottom of hole (incremental programming)
R_: the position of point R (absolute programming); the distance from the initial point to point R
(incremental programming)
P_: the dwell time at the bottom of hole, in ms, with no decimal point
F_: feed speed, even if the canned cycle is cancelled, this modal data is still effective in the
subsequent machining. (Currently, tapping speed is specified by the parameter ―spindle speed when
tapping‖, instead of by this F data.)
K_: number of repeats (repeated movement and drilling, effective under G91 incremental mode)
Hole-machining process is as shown in Fig. 4-20. In G98, the cutter will return to the initial point
after hole-machining is finished. But in G99, the cutter will return to point R after hole-machining is
finished.
Fig. 4-20 G74 Machining Process
Process Description:
1. The cutter moves to the specified hole position (X, Y) at G00 speed;
2. Goes down to the specified point R at G00 speed;
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