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Chapter 3 G Commands
149
Ⅰ
Programming
F: Thread lead,. After F value is executed, it is reserved and can be omitted; F
（
I
）
> 0
right-hand thread,F
（
I
）
< 0 left-hand thread
；
L: Multi threads: 1
～
99 and it is modal parameter. (The system defaults it is single
thread when L is omitted)
S: The speed of thread cutting and modal value can be specified the spindle speed
before this block;
A
B
C
D
X
Z
X/2
U/2
Z
W
①
②
③
④
F
Fig. 3-92
X/2
U/2
F
A
B
C
D
①
②
③
④
W
Z
R
Z
X
Fig. 3-93
The system can machine one thread with many tool infeed in G92.1, but cannot do continuous
two thread and end face thread. Definition of thread pitch in G92.1 is the same that of G32, and a
pitch is defined that it is a moving distance of long axis(X in radius) when the spindle rotates one rev.
Pitch of taper thread is defined that it is a moving distance of long axis(X in radius). When
absolute value of Z coordinate difference between B point and C point is more than that of X (in
radius), Z is long axis; and vice versa.
Cycle process:
straight thread as Fig.3-92 and taper thread as Fig.3-93.
①
X axis rapidly moves to the cutting start B from the cycle start A. Spindle positions to
the start angle if it is the multi-head thread. Refer to the motion in the Fig. 3
①
-92 or
3-93;
②
The feed axis is interpolated to end C with the spindle thread from the cutting start B,
