GSK 988T, User Manual

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GSK988T Turning CNC System User Manual
94
Ⅰ
Programming
F It is the first thread pitch from starting point, and its range is the same that of
G32
R Incremental value or decremental value of spindle per pitch, R=F2-F1, R is with
a direction; F1>F2, the pitch decreases when R is negative; F1<F2, the pitch
increases when R is positive; R range: ±0.01 inch/pitch~ ±499.99
mm/pitch(metric thread);
±0.01 inch/pitch~ ±9.98 inch/pitch
（
inch thread
）；
An alarm occurs when R value exceeds the above range and the pitch exceeds
the permissive range because of R increment/decrement or the pitch is
negative.
Fig. 2-58
Caution:
●
It is the same as that of G32.
Example: First pitch of starting point : 4mm, increment 0.2mm per rev of spindle.
Fig. 2-59 Variable pitch thread machining
Value
：
δ 1 = 4mm
，
δ 2 = 4mm
，
total cutting depth 1mm
，
total cutting cycle 2 times
；
1
st
tool infeed 0.7mm.
Program
：
O0010
；
G00 X60 Z4 M03 S500
；
G00 U-10
；
G00 U-0.7 ；
G34 W-78 F4 J5 K2 R0.2
；
G00 U10 ；
Z4
；
G00 X50
；
Tool infeed
Ф 50
Tool infeed
Variable pitch thread cutting
Tool retraction
Z returns to initial point
Tool infeed again Ф 50
Tool infeed