Siemens SINUMERIK 840D sl Programming Manual page 653

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 assigned. After fast
retraction, an interrupt routine can also be executed (SINUMERIK 840D).
Feed override
The programmed velocity is overriden by the current velocity setting made via the → machine
control panel or from the → PLC (0 to 200%). The feed velocity can also be offset by applying
a programmable percentage factor (1 to 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.
Geometry
Description of a -> workpiece in the -> workpiece coordinate system.
geometry axis
Geometry axes are used to describe a 2- or 3-dimensional range in the workpiece coordinate
system.
Job planning
Programming Manual, 03/2006 Edition, 6FC5398-2BP10-1BA0
Glossary
Glossary-7