
4.AUTOMATIC OPERATION OPERATION B-63324EN-1/03
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Fig. 4.11 (i)
When reverse movement is started after a feed hold halt, the position from
the start point of the current block up to the position where feed hold was
halted is taken as a single block. For this reason, the single block is halted
if the tool returns to the position where reverse movement is started when
forward return movement is performed with the single block switch ON.
- Start of reverse movement and forward return movement after single block halt
Reverse movement or forward return movement can be restarted after a
single block halt by switching the reverse movement signal and restarting
program execution.
- Dwell (G04)
The dwell command (G04) is executed in reverse movement and forward
return movement in the same way as during regular operation.
Limitation
- Blocks that do not allow reverse movement
Reverse movement cannot be performed for the blocks listed below.
When forward movement is stopped by feed hold during the execution of
one of these commands or modes, after which an attempt is made to
perform reverse movement at that point, reverse movement terminates
immediately. When one of the following commands is encountered during
reverse movement, the reverse movement terminates at that point, and
"RVED" is displayed.
- Inch/metric conversion (G20,.G21)
- Functions related to reference position return (G27, G28, G29, G30)
- Floating reference position return (G30.1)
- Thread cutting (G33)
- Remote buffer (G05)
- Circular thread cutting B (G20.1, G30.1)
- Polar coordinate interpolation (G12.1, G13.1)
- Cylindrical interpolation(G7.1)
- Exponential interpolation (G02.3, G03.3)
Start of reverse movement
Feed hold start
Reverse movement switch ON
Cycle start
Feed hold start
Reverse movement switch OFF
Cycle start
Start of forward return movement
after completion of reverse movement