Siemens SINUMERIK 840D Operator's Manual page 160

A
Appendix
B Terms
Reference point
Reference point
approach
REPOS
Retentive/non-volatile
data
Rotation
Rotary axis
Rotary axis, endlessly
turning
R parameters
Rounding axis
A-160
Point on the machine tool used to reference the measuring system of
the -> machine axes.
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.
1. Repositioning on the contour via the controls
With the Repos function it is possible to re-approach the
interruption point by means of the direction keys.
2. Repositioning on the contour via the program
Several approach strategies are available through 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.
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.
Component of a -> frame which defines a rotation of the coordinate
system through a specific angle.
Rotary axes rotate a workpiece or tool to a defined angular position.
Depending on the application, the traversing range of a rotary axis
can be selected to be limited to less than 360 degrees or to be
endlessly turning in both directions. Endlessly-turning rotary axes are
used for non-circular turning, grinding, and winding.
Arithmetic parameter for which the programmer of the -> parts
program can freely assign or request values in the program.
Rounding axes rotate a workpiece or tool to an angular position
corresponding to an indexing grid. On reaching a grid, the rounding
axis is "in position".
SINUMERIK 840D/840Di/810D Operator's Guide Handheld Terminal 6 (BAH) - 03.04 Edition
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03.04
 Siemens AG, 2004. All rights reserved.