14. FUNCTIONS TO SIMPLIFY
The following program generates the cutting path shown in Fig. 14.2.5
(a). Chip breaking is possible in this cycle as shown below. If X (U) and
Pare omitted, operation only in the Z axis results, to be used for drilling.
e : Return amount
This designation is modal and is not changed until the other value is
designated. Also this value can be specified by the parameter No. 5139, and
the parameter is changed by the program command.
X : X component of point B
U : Incremental amount from A to B
Z : Z component of point C
W : Increment amount from A to C
∆i : Movement amount in X direction (without sign)
∆k : Depth of cut in Z direction (without sign)
∆d : Relief amount of the tool at the cutting bottom. The sign of ∆d is always plus
(+). However, if address X (U) and ∆i are omitted, the relief direction can be
specified by the desired sign.
f : Feed rate
k’ k k k
(R) (R) (R)
(F) (F) (F)
G74R (e) ;
G74X(U)_ Z(W)_ P(
ni) Q(nk) R(nd) F (f ) ;
Fig. 14.2.5 (a) Cutting Path in End Face Peek Drilling Cycle
1 While both e and nd are specified by address R, the
meanings of them are determined by the present of address
X (U). When X(U) is specified, nd is used.
2 The cycle machining is performed by G74 command with X
End Face Peck Drilling