Siemens Sinumerik 840D sl Programming Manual page 199

Languages
The texts of the user interface, system messages and alarms are available in five
system languages: English, German, French, Italian and Spanish. The user can always
select two of the languages listed in the control system.
Leadscrew error compensation
Compensation for the mechanical inaccuracies of a spindle involved in the feed movement.
Errors are compensated by the control system on the basis of the measured deviations that
are stored in the control system.
Linear axis
In contrast to a rotary axis, a linear axis describes a straight line.
Linear interpolation
In the linear interpolation, the tool moves along a straight line to the end point during
machining of the workpiece.
LookAhead
The "LookAhead" function is a means of optimizing the machining speed through looking
ahead using a parameterizable number of traversing blocks.
LookAhead for contour violations
The control system recognizes and reports the following types of collision:
The travel path is shorter than the tool radius.
The width of the internal corner is smaller than the tool diameter.
Machine control panel
A control panel in the machine tool having operator controls such as keys, rotary switches,
etc., as well as simple displays such as LEDs. The machine control panel is used for direct
control of the machine tool via the PLC.
Machine coordinate system
Coordinate system based on the axes of the machine tool.
Machine zero
A fixed point on the machine tool to which all measuring systems (derived from it) refer.
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
Glossary
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