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

OPERATION
B–62764EN/01
4. AUTOMATIC OPERATION
621
With the retrace function, the tool can be moved in the reverse direction
(reverse movement) by using the REVERSE switch during automatic
operation to trace the programmed path. The retrace function also enables
the user to move the tool in the forward direction again (forward return
movement) along the retraced path until the retrace start position is
reached. When the tool reaches the retrace start position, the tool resumes
movement according to the program.
Procedure for Retrace Operation
To move the tool in the forward direction, turn off the REVERSE switch
on the operators panel, then press the cycle start switch. If the REVERSE
switch on the operators panel is on, the tool moves in the reverse direction
or completes reverse movement.
Three methods are available for moving the tool in the reverse direction
along the programmed path.
1) When the tool is moving in the forward direction, turn on the
REVERSE switch on the operators panel during block execution.
2) When the tool is moving in the forward direction, turn on the
REVERSE switch on the operators panel after a single block stop.
3) When the tool is moving in the forward direction, turn on the
REVERSE switch on the operators panel after a feed hold stop.
In the case of 1) above, the tool starts reverse movement after completion
of the block currently being executed (after execution up to the position
of a single block stop). Turning on the REVERSE switch on the
operators panel does not immediately start reverse movement.
REVERSE swtch rurned on
Cycle start
(forward movement started)
Reverse movement started
Forward movement
Reverse movement
In the case of 2) above, the tool starts reverse movement at the position
of a single block stop when the cycle start switch is pressed.
Single block stop
REVERSE switch
turned on cycle start
Forward movement
Reverse movement
Reverse movement started
Cycle start
(forward movement started)
In the case of 3) above, the tool starts reverse movement at the position
of a feed hold stop when the cycle start switch is pressed.
4.11
RETRACE FUNCTION

D Forward movement
Reverse movement

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