GSK 988T, User Manual

Page: 109 / 416

Chapter
Ⅱ
G Commands
95
Ⅰ
Programming
G00 U-1.0
；
G34 W-78 F4 J5 K2 R0.2
；
G00 U10
；
Z4
；
M30
；
Variable pitch thread cutting
Tool retraction
Z returns to initial point
2.16.3 Thread cutting cycle G92
Command function: Tool infeeds in radial(X) direction and cuts in axial(Z or X, Z) direction
from starting point of cutting to realize straight thread, taper thread cutting
cycle with constant thread pitch. Thread run-out in G92: at the fixed distance
from end point of thread cutting, Z executes thread interpolation and X
retracts with exponential or linear acceleration, and X retracts at rapidly
traverse speed after Z reaches to end point of cutting as Fig. 2-52 and
Fig.2-53.
Command format
：
G92 X
（
U
）
_ Z
（
W
）
_ F_ J_ K_ L Q
； （
straight thread cutting
cycle
）
G92 X
（
U
）
_ Z
（
W
）
_ R_ F_ J_ K_ L Q
； （
taper thread cutting cycle
）
Command specifications: G92 is modal;
X X absolute coordinate of end point of cutting
U Different value of X absolute coordinate from end point to starting point of cutting
Z Z absolute coordinate of end point of cutting
W Different value of X absolute coordinate from end point to starting point of cutting
R Different value(R value) of X absolute coordinate from end point to starting point of
cutting. When the sign of R is not the same that of U, R
│≤│ U/2 │
F Metric thread pitch is the same that of G32. After F value is executed, it is reserved
and can be omitted
J Travel in the short axis in thread run-out is same that of G32 and cannot be less than 0
without direction ( automatically define its direction according to starting position of
program), and it is modal parameter. If the short axis is X, its value is specified by
radius
K Travel in the long axis in thread run-out is same that of G32 without direction
( automatically define its direction according to starting position of program), and it is
modal parameter. If the long axis is X, its value is specified by radius
L
Multi threads: 1
～
99 and it is modal parameter. ( The system defaults it is single
thread when L is omitted)
Q Shift angle of initial angle at the beginning of thread cutting. Its range is referred to
G32.
The system can machine one thread with many tool infeed in G92, but cannot do continuous
two thread and end face thread. Definition of thread pitch in G92 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
revolution.
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