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Start, Feed Hold & Reset

Three keys run everything. What separates them is what survives.

KeyDoesAfterwards
STARTruns the loaded program from where it standsthe program runs on
HOLDstops the motion, keeps the programpress HOLD again, then START
RESETends the programthe next START begins at the top

START

Section titled “START”

Cycle start runs the loaded program. Pressed again after a hold, it carries on.

It is refused, not queued, when the machine is not in a state to run: an alarm is standing, the machine is unreferenced, retrace is on, or you have jogged off the path and not returned. The screen says which.

HOLD

Section titled “HOLD”

Feed hold decelerates the machine to a stop on the path and keeps everything else: the program, the line it stopped on, the modal state, the spindle.

Because the program is only paused, you can jog away to look at something and come back to it. That is what the MANUAL screen’s RECOVERY tab is for.

Two things feed hold will not interrupt:

  • The plunge inside a drilling cycle. The tool does not stop part way down a hole with the cutter engaged. It stops between holes.
  • A tapping cycle. The tap is synchronised to the spindle; stopping mid-thread would break it.

HOLD stays lit while the machine is held. Press HOLD again to release it, then cycle start to carry on. Cycle start on its own does not clear a hold: while HOLD is lit, pressing start does nothing.

RESET

Section titled “RESET”

Reset ends the program. It is the way out, not a pause:

  • The program stops and goes back to the top.
  • The spindle stops.
  • Modal state goes back to its power-up condition: G00, G17, G90, cutter and length compensation off, any cycle cancelled. Protection re-arms even if the program turned it off.
  • The feed is cleared too. A later G01 with no F on it alarms rather than cutting at the dead program’s feedrate. State the feed again.
  • The retained path goes, so retrace has nothing left to wind back through.

Offsets, the tool table and the tool in the spindle are not touched. Reset ends a run; it does not undo your setup and it does not forget what is in the spindle.

Use it when the run is over, whether finished, wrong or abandoned. Use HOLD when you intend to carry on.

Where to go next

Section titled “Where to go next”