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GSK980TDi Turning CNC System User Manual
140
Ⅰ
Programming
specified value per rev and one spiral grooving with variable lead on the
surface of workpiece to realize thread cutting with variable lead. Tool
retraction can be set in thread cutting.
F, I are specified separately to metric, inch pitch. Executing G34 can machine metric or inch
straight, taper, end face thread with variable pitch.
Command specifications:
G34 is modal;
Meanings of X(U) , Z(W) , J, K are the same that of G32;
F: Specify lead, and its range is referred to Table 1-2;
I: Specify thread teeth per inch, and its range is referred to Table 1-2;
R: Increment or decrement of pitch per rev, R=F1- F2, with direction; F1>F2, pitch decreases
when R is negative; F1<F2, pitch increases when R is positive (as Fig. 3-41);
R: ±0.001~±500.000 mm/pitch (metric thread);
±0.060~±2540 tooth/inch (inch thread).
The system alarms when R exceeds the above-mentioned range or the pitch exceeds
permissive value or is negative owing to R increases or decreases.
Fig. 3-85 Variable pitch thread
Note: It is the same as that of G32.
Example: First pitch of starting point
:
4mm, increment 0.2mm per rev of spindle.
δ 2
X
Z
δ 1
5 0
7 0
Fig. 3-86 Variable pitch thread machining
Use macro variables to simplify programming when G34 is used many times.
δ
1 = 4mm,
δ
2 =
4mm, total cutting depth 4mm, total cutting cycle 15 times; first tool infeed 0.8mm, gradual decreasing
cutting every time 0.2mm, min. infeed 0.2mm.
Program
：
O0010
；
G00 X60 Z4 M03 S500;
G65 H01 P#102 Q800;
G65 H01 P#103 Q0;
N10 G65 H02 P#104 Q#103
R1;
First tool infeed: assignment #102=0.8mm
Cycle count: assignment #103=0
Cycle count starting: #104=#103+1
#103=#104
Starting point of
machining
