FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
B–62754EN/01
14. FUNCTIONS TO SIMPLIFY
PROGRAMMING
169
k
d
pn
a
B
d
G76P (m) (r) (a) Q (d min) R(d);
G76X (u) _ Z(W) _ R(i
) P(k) Q(d) F(L) ;
m ; Repetitive count in finishing (1 to 99)
This designation is modal and is not changed until the other value is
designated. Also this value can be specified by the parameter No.
5142, and the parameter is changed by the program command.
r : Chamfering amount
When the thread lead is expressed by L, the value of L can be set from
0.0L to 9.9L in 0.1L increment (2–digit number from 00 to 90).
This designation is modal and is not changed until the other value is
designated. Also this value can be specified by the parameter No.
5130, and the parameter is changed by the program command.
a : Angle of tool tip
One of six kinds of angle, 80
°, 60°, 55°, 30°, 29°, and 0°, can be selected,
and specified by 2–digit number.
This designation is modal and is not changed until the other value is
designated. Alsothisvalue canbespecified bytheparameter No.5143,
and the parameter is changed by the program command.
(Example)
When m=2, r=1.2L, a=60
°, specify as shown below (L is lead of thread).
P
m
r a
02 12 60
dmin : Minimum cutting depth (specified by the radius value)
When the cutting depth of one cycle operation (d – d –1) becomes
smaller than this limit, the cutting depth is clamped at this value. This
designation is modal and is not changed until the other value is
designated. Also this value can be specified by parameter No.
5140, and the parameter is changed by the program command.
d : Finishing allowance
This designation is modal and is not changed until the other value
is designated. Also this value can be specified by parameter No.
5141, and the parameter is changed by the program command.
i : Difference of thread radius If i = 0, ordinary straight thread cutting
can be made.
k : Height of thread
This value is specified by the radius value.
nd : Depth of cut in 1st cut (radius value)
L : Lead of thread (same as G32).
Tool tip
1st
2nd
3rd
nth
m, r, and a are specified by address P at the same time.
Fig. 14.2.7 (b) Detail of cutting

Leave a Reply

Your email address will not be published. Required fields are marked *