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In the current position page, the "TO GO" column is displayed for the axes selected.
Release the "Backtrack along path" button when the backtrack point is reached.
Backtrack is immediately stopped.
Perform the actions which made backtrack necessary.
The system allows a return to a selected position on the tool path to be made by the Return along path function (see
5.5.1.10) or programming to be resumed by cancelling the machining interruption (see Programme resumption under
Notes).
Exit from the procedure
If no tool/workpiece datum shift was programmed or this shift has been cancelled (see Tool/workpiece datum shift
under Notes), machining can be resumed at any time.
Release the "Backtrack" pushbutton.
The current backtrack is immediately stopped.
Press the "CYCLE" pushbutton to resume machining.
The "INCYC" indicator comes on in the status window (see 3.1.3) and programme execution is resumed (see
Movement mode under Notes for the speed of movement). During resumption, a new machining interruption can be
requested by pressing "FEED STOP".
Notes on Backtrack along Path and Return along Path
Backtrack (and return) along path are possible in automatic (AUTO), single step (SINGLE) or dryrun (DRYRUN) mode:
- In automatic mode, the blocks are sequenced automatically as long as the operator holds the "Backtrack" or
"Return" button depressed, at the rate declared in the block being executed.
- In single step mode, movement is continuous until the beginning of the current block (movement is stopped if the
operator releases the "Backtrack" or "Return" button). To backtrack (or return) to the beginning of the next block,
it is necessary to press "Backtrack" or "Return" again. Movement is at the speed declared in the current block.
- Execution in dryrun mode is the same as in automatic mode except that movement is at the traverse rate.
REMARKS A change of mode (automatic, single step or dryrun) is always possible at the end
of a block.
In single step mode, pressing "Backtrack" or "Return" at the end of a block forces
a cycle start.
When resuming the block interrupted by "FEED STOP", the initial mode is
restored.
Tool/workpiece datum shift
A datum shift of the tool with respect to the workpiece can be applied to backtrack or return at any time (with machining
interrupted and "CYHLD" indicator lit).
To shift the toolhead (for further information, see Sec. 5.5.1.2, Retracting the Axes), press the "AXRCL" button on the
machine panel (the "AXRCL" indicator is lit in the status window) and retract the toolhead using the axis jogs.
This procedure is also use to change or cancel the datum shift.
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