GSK GSK980TDc, Manual

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Chapter 3 G Commands
131
Ⅰ
Progra
mming
Fig. 3-48(b)
Pitch is defined to moving distance ( X radius value) of long axis when the spindle rotates one rev.
Z is long when absolute value of coordinate difference between C point and D point in Z direction is
more than that of X direction ( radius value, be equal to absolute value of i); and vice versa
Execution process:
①
The tool rapidly traverses to B
1
, and the thread cutting depth is
△
d. The tool only
traverses in X direction when a=0; the tool traverses in X and Z direction and its
direction is the same that of A
→ D when a ≠ 0;
②
The tool cuts threads paralleling with C → D to the intersection of D → E (r ≠ 0: thread
run-out);
③ The tool rapidly traverses to E point in X direction;
④
The tool rapidly traverses to A point in Z direction and the single roughing cycle is
completed;
⑤ The tool rapidly traverses again to tool infeed to B
n
( is the roughing times), the cutting
depth is the bigger value of (
n
× △ d) ,(
1 - n
× △ d+ △ d
min
) , and execute ② if the
cutting depth is less than(k-d) ; if the cutting depth is more than or equal to(k-d) , the tool
infeeds(k-d) to B
f
, and then execute ⑥ to complete the last thread roughing;
⑥
The tool cuts threads paralleling with C → D to the intersection of D → E (r ≠ 0: thread
run-out);
⑦ X axis rapidly traverses to E point;
⑧
Z axis traverses to A point and the thread roughing cycle is completed to execute the
finishing;
⑨ After the tool rapidly traverses to B(the cutting depth is k and the cutting travel is d),
execute the thread finishing, at last the tool returns to A point and so the thread finishing
cycle is completed;
⑩ If the finishing cycle time is less than m, execute ⑨ to perform the finishing cycle, the
thread cutting depth is k and the cutting travel is 0; if the finishing cycle times are equal
to m, G76 compound thread machining cycle is completed.
Notes:
●
In thread cutting, execute the feed hold, the system displays
Pause
after the thread
cutting is executed completely, and then the program run pauses;
● Execute single block in thread cutting, the program run stops after returning to starting
point(one thread cutting cycle is completed);