
4.AUTOMATIC OPERATION OPERATION B-63324EN-1/03
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- Forward return movement → Forward movement
When the tool completes a forward return movement up to the block where
reverse movement was started, the tool automatically resumes forward
movement. Programmed commands are read and program execution is
continued. No particular operation is required to resume forward
movement.
When tool movement switches from forward return movement to forward
movement, the display of RTRY (Re-TRY) in the lower-right corner of the
CRT screen disappears.
Fig. 4.11 (h)
If the tool moves in the reverse direction after a feed hold stop, the tool
stops forward return movement at the position of the feed hold stop, then
resumes forward movement. If the tool moves in the reverse direction after
a single block stop, the tool also stops forward return movement at the
position of the single block stop.
Explanation
- Forward reverse movement
In automatic operation, a program is usually executed in the order that
commands are specified. This mode of execution is referred to as forward
movement. The retrace function can execute in reverse, program blocks
that have already been executed. This mode of execution is referred to as
reverse movement. In reverse movement, the tool can retrace the tool path
followed by forward movement.
A program can be executed in the reverse direction only for those blocks
that have already been executed in the forward direction.
The tool can perform reverse movement one block at a time when the
single block
mode is set.
- Status display
During reverse movement, the letters "RVRS" blink on screen. During
forward return movement, the letters "TRRY" blink on screen to inform
the operator that forward return movement is in operation. The "RTRY"
display continues until the tool returns to the block where reverse
movement was started to start regular operation, in other words, to the
position where forward return movement is enabled.
Cycle start
(forward movement started)
Feed hold stop
Reverse movement signal=1,cycle start
Reverse movement
started
Forward movement
Reverse movement
Forward returnmovemnt
Forward movement started
Forward return movement started