Siemens SINUMERIK 840DE Programming Manual page 494

Glossary
Protection zone
Three-dimensional space within the -> working area, which the tool tip is not permitted to
enter.
Quadrant error compensation
Contour errors at quadrant transitions, which arise as a result of changing friction conditions
on the guideways, can be virtually entirely eliminated with the quadrant error compensation.
Parameterization of the quadrant error compensation is performed by means of a circuit test.
R variables
Arithmetic parameter, for which the programmer of the -> parts program can freely assign or
request values in the program.
Rapid traverse
The highest speed of an axis. It is used, for example, to move the tool from rest position to
the -> workpiece contour or retract the tool from the contour.
Reference point
Point on the machine tool used to reference the measuring system of the -> machine axes.
Reference point approach
If the utilized distance measuring system is not an absolute value encoder then it is
necessary to perform a reference point approach to ensure that the actual values returned
by the measuring system match the machine coordinate values.
REPOS
1. REPOS operation
2. REPOS program
Retentive memory
Data areas in data blocks and times, counters and markers are retentive (non-volatile) if their
contents are not lost when the system is restarted or the mains supply is disconnected.
Rigid tapping
This function allows threads to be tapped without a compensating chuck. By using the
method whereby the spindle, as a rotary axis, and the drilling axis interpolate, threads can be
Glossary-18
Using the REPOS function and the direction keys, repositioning to the interruption point
can be carried out.
Several approach strategies are available using program commands: approaching the
interruption point, approaching the block starting point, approaching the block end point,
approaching a point on the path between the start of the block and the interruption point.
Programming Manual, 10.2004 Edition, 6FC5 298-7AB00-0BP1
Fundamentals