TOMATECH AUTOMATION
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 B1, 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 Bn ( is the roughing times), the cutting
depth is the bigger value of ( n ×△d) ,( n -1 ×△d+△dmin) , 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 Bf, 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);
● The thread cutting decelerates to stop when the system resets and emergently stop or
the driver alarms;
● Omit all or some of G76 P(m) (r) (a) Q(△dmin) R(d) . The omitted address runs
according to setting value of parameters;
● m, r, a used for one command address P are input one time. Program runs according
to setting value of №57, 19, 58 when m, r, a are all omitted; Setting value is a when
address P is input with 1 or 2 digits; setting values are r, a when address P is input with 3
or 4 digits;
● The direction of A→C→D→E is defined by signs of U,W , and the direction of C→D is
defined by the sign of R(i) . There are four kinds of sign composition of U, W
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