FANUC Series 16/18/160/180-Model C for Lathe Operator Manual

PROGRAMMING
4. INTERPOLATION FUNCTIONS
B–62754EN/01
62
WARNING
1 Feedrate override is effective (fixed at 100%) during thread cutting.
2 it is very dangerous to stop feeding the thread cutter without stopping the spindle. This will
suddenly increase the cutting depth. Thus, the feed hold function is ineffective while thread
cutting. If the feed hold button is pressed during thread cutting, the tool will stop after a block
not specifying thread cutting is executed as if the SINGLE BLOCK button were pushed.
However, the feed hold lamp (SPL lamp) lights when the FEED HOLD button on the machine
control panel is pushed. Then, when the tool stops, the lamp is turned off (Single Block stop
status).
3 When the FEED HOLD button is held down, or is pressed again in the first block that does not
specify thread cutting immediately after a thread cutting block, the tool stops at the block that
does not specify thread cutting.
4 When thread cutting is executed in the single block status, the tool stops after execution of the
first block not specifying thread cutting.
5 When the mode was changed from automatic operation to manual operation during thread
cutting, the tool stops at the first block not specifying thread cutting as when the feed hold button
is pushed as mentioned in Note 3.
However, when the mode is changed from one automatic operation mode to another, the tool
stops after execution of the block not specifying thread cutting as for the single block mode in
Note 4.
6 When the previous block was a thread cutting block, cutting will start immediately without
waiting for detection of the 1–turn signal even if the present block is a thread cutting block.
G32Z _ F_ ;
Z _; (A 1–turn signal is not detected before this block.)
G32 ; (Regarded as threading block.)
Z_ F_ ;(One turn signal is also not detected.)
7 Because the constant surface speed control is effective during scroll thread or tapered screw
cutting and the spindle speed changes, the correct thread lead may not be cut. Therefore, do
not use the constant surface speed control during thread cutting. Instead, use G97.
8 A movement block preceding the thread cutting block must not specify chamfering or corner
R.
9 A thread cutting block must not specifying chamfering or corner R.
10 The spindle speed override function is disabled during thread cutting. The spindle speed is
fixed at 100%.
11 Thread cycle retract function is ineffective to G32.

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