
B–63502EN/01
13. FUNCTIONS TO SIMPLIFY
PROGRAMMING
NC FUNCTION
123
The following command permits operation as seen in the figure below.
Chip breaking is possible in this cycle. Also if both x(u) and P are
omitted, the machining is done only in the Z-axis resulting in peck
drilling.
U/2
W
Dd
C
∆k’
A
(R)
(F)
∆i
e
B
X
(F)
[0<∆i’x∆i]
∆k ∆k ∆k ∆k
(R) (R) (R) (R)
(F) (F) (F)
(F)
[0<∆k’x∆k]
∆i
∆i’
R : Rapid traverse
F : Cutting feed
(X_, Z_)
G74 R(e) ;
G74 X_ Z_ P(ns) Q(nf) U(∆u) F(f) ;
e : Amount of return
X : X-axis coordinate of point B
U : Increment for A → B (for G code system A)
Z : Z-axis coordinate of point C
W : Increment for A → C (for G code system A)
∆i : Movement amount in X-axis direction (without sign)
∆k : Depth of cut in Z-axis direction (without sign)
∆d : Clearance amount at the cutting bottom
Usually a positive integer is specified. If X(U) and i are
omitted, however, the sign indicating the direction is added.
f : Feedrate
X_ Z_
U_W_
13.5.5
Peck Drilling in Z-axis
(G74)
Format