Wuhan Huazhong Numerical Control Co., Ltd HNC-18iT, Programming Manual

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9. Functions to Simplify Programming
112
9.2.4
9.2.4 9.2.4
9.2.4 Multiple
Multiple Multiple
Multiple Thread
Thread Thread
Thread Cutting
Cutting Cutting
Cutting Cycle
Cycle Cycle
Cycle (G76)
(G76) (G76)
(G76)
Programming Programming Programming Programming
G76 C(c) R(r) E(e) A(a) X(U) Z(W) I(i) K(k) U(d) V(
Δ
dmin) Q(
Δ
d) P(p) F(L)
Explanation
Explanation
Explanation Explanation of
of
of of the
the
the the parameters
parameters
parameters parameters
C(c) Repetitive count in finishing (1~99)
R(r) Retraction amount on Z axis (00~99)
E(e) Retraction amount on X axis (00~99)
A(a) Angle of tool tip (two-digit number). It could be 80°, 60°, 55°, 30°, 29°, or 0°.
X, Z Coordinate value of end point (point C) in absolute command.
U, W Coordinate value of end point (point C) with reference to the initial point
(point A) in incremental command
I(i) Difference of thread radius. If i=0, it is straight thread cutting.
K(k) Height of thread. This value is specified by the radius value on X axis.
U(d) The finishing allowance (radius designation).
V(
Δ
dmin) The minimum cutting depth (radius designation). The cutting depth is
Δ
dmin
when the cutting depth (
∆ ∆ d n d n − − 1
) is less than
Δ
dmin.
Q(
Δ
d) Depth of cutting at the first cut (radius designation)
P(p) Start point offset.
F(L) Thread lead
d
B
C
(R)
i
e
u/2
A
D
K
(R)
(F)
(R)
+ + + +Z Z Z Z
w
r
+ + + +X X X X
z
x/2
Figure 9.28 Multiple Thread Cutting Cycle (G76)