1. G Function Description
1.2.34 G74: LEFT HAND TAPPING CYCLE
Command form:
G74 X Y Z R P F K ；
X_ or Y_: coordinates of holes (absolute/increment)
Z_:
G91: the distance from the bottom of the hole to point Z (directional)
G90: program position of point Z
R_:
G91: the distance from initial level to R point level (directional)
G90: program position of point R
P_: dwell time (s)
F_: feedrate
K_: number of repeats (repeat movement and drilling, G91 is effective)
X, Y, Z, R: use G90/91 to decide absolute or increment
PIC:
G98
G99
(X,Y) Initial point
(X,Y) Initial point
R point
Rotate reverse after dwell P(s)
R point
Rotate reverse after dwell P(s)
Z point
Rotate CW after dwell P(s)
Z point
Rotate CW after dwell P(s)
Description:
1. use G00 to move to specified(X,Y) when start to perform
2. use G00 to specified point R.
3. use G01 to reach the bottom of the hole ,point Z
4. dwell P(s) then reverse the drill
5. use G01 raise to point R
6. dwell P(s) then reverse the drill
7. use G00 to raise to initial point (G98) or programmable point
R(G99)
87
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