Glossary
Fundamentals
Programming Manual, 11/2006, 6FC5398-1BP10-2BA0
533
Exact stop
With a programmed exact stop instruction, the position stated in a block is approached
precisely and very slowly, if necessary. In order to reduce the approach time, -> exact stop
limits are defined for rapid traverse and feed.
Exact stop limit
When all path axes reach their exact stop limits, the control responds as if it had reached its
destination point precisely. The -> part program continues execution at the next block.
External zero offset
Zero offset specified by the -> PLC.
Fast retraction from contour
When an interrupt occurs, a motion can be initiated via the CNC machining program,
enabling the tool to be quickly retracted from the workpiece contour that is currently being
machined. The retraction angle and the distance retracted can also be parameterized. After
fast retraction, an interrupt routine can also be executed (SINUMERIK 840D).
Feed override
The programmed velocity is overridden by the current velocity setting made via the
→ machine control panel or by the → PLC (0% to 200%). The feedrate can also be corrected
by a programmable percentage factor (1-200%) in the machining program.
Finished-part contour
Contour of the finished workpiece. See -> blank.
Fixed machine point
A point defined uniquely by the machine tool, e.g. the reference point.
Fixed-point approach
Machine tools can approach fixed points such as a tool change point, loading point, pallet
change point, etc. in a defined way. The coordinates of these points are stored in the control.
Where possible, the control moves these axes in -> rapid traverse.
Frame
A frame is an arithmetic rule that transforms one Cartesian coordinate system into another
Cartesian coordinate system. A frame contains the components -> zero offset, -> rotation, ->
scaling, -> mirroring.
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