FANUC Series 16/18/160/180-Model C Machining Center Operators Manual

OPERATION
B–62764EN/01
4. AUTOMATIC OPERATION
627
In reverse movement and forward return movement, the skip signal and
automatic tool length measurement signal are ignored. In reverse
movement and forward return movement, the tool moves along the path
actually followed in forward movement.
Forward return
movement
Reverse
movement
When the signal is not applied
(G31) (Programmed path)
Forward movement
(actual path)
Skip signal on (G31) or automatic tool
length measurement signal on (G37)
Whether the chopping operation is performed in reverse movement and
forward return movement is determined by whether the chopping
operation was performed at the end of forward movement.
If the tool starts reverse movement with the chopping mode off and moves
in the reverse direction along the path of a block where the chopping mode
is on, the chopping axis maintains its position at point R.
When a block specifying G81.1 (chopping command) appears during
reverse movement, reverse movement ends and operation stops.
Along the path of a block where the tool moved according to inverse time
feed in forward movement, the tool moves in the reverse direction
according to the feedrate specified by parameter No. 1414 (= 0) for reverse
movement.
If parameter No. 1414 for specifying the feedrate for reverse movement
is not set (= 0), the tool moves in the reverse direction at the same feedrate
as during forward movement.
If the on/off mode of constant surface speed control is specified in reverse
movement, the specified mode is used in subsequent reverse movement.
In other words, when a block specifying G96Sxxxx; appears in reverse
movement, constant surface speed control is on for subsequent reverse
movement. When a block specifying G97Sxxxx; appears in reverse
movement, constant surface speed control is off for subsequent reverse
movement.
Note that the on/off mode of constant surface speed control in forward
movement is reversed in reverse movement.
If the command for clamping maximum spindle speed is specified in
reverse movement, the specified clamp is applied to subsequent reverse
movement. In other words, when G92Sxxxx appears in reverse
movement, the spindle speed is clamped at Sxxxx. Note, however, that
the spindle speed is clamped only when the G96 mode is set.
D Skip funtion (G31),
automatic tool length
measurement (G37)
D Chopping function
(G81.1)
D Inverse time feed (G93)
D Constant surface speed
control on/off (G96,G97)
D Clamping maximum
spindle speed
(G92Sxxxx)

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