TOMATECH AUTOMATION
Cutting infeed: #100=#102
Tool infeed
Variable pitch cutting
Tool retraction
Z returns to starting point
Decreasing of cutting feed again: #101=#100-0.2
Assignment again #102=#101
Infeed: Jump to block N20 when #102≦0.2mm
Unconditionally jump to block N10
Min. infeed: #102=0.2
Unconditionally jump to block N10
Starting point of machining
Programming
3.21.4 Z thread cutting G33
Command format：G33 Z(W)__ F(I)__ L__ ；
Command function: Tool path is from starting point to end point and then from end point
to starting point. The tool traverses one pitch when the spindle rotates one rev, the pitch
is consistent with pitch of tool and there is spiral grooving in internal hole of
workpiece and the internal machining can be completed one time.
Command specification: G33 is modal command;
Z(W): When Z or W is not input and starting point and end point of Z axis are the same
one, the thread cutting must not be executed;
F: Thread pitch, and its range is referred to Table 1-2;
I: Teeth per inch thread 0.06～25400 teeth/inch; its range is referred to Table 1-2. It is
single thread when L is omitted.
Cycle process:
① Z tool infeed (start spindle before G33 is executed);
② M05 signal outputs after Z reaches the specified end point in programming;
③ Test spindle after completely stopping;
④ Spindle rotation (CCW) signal outputs(reverse to the original rotation direction);
⑤ Z executes the tool retracts to starting point;
⑥ M05 signal outputs and the spindle stops;
⑦ Repeat the steps ①～⑤ if multi threads are machined.
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