Siemens Sinumerik 840D sl Programming Manual page 202

Glossary
NURBS
Motion control and path interpolation are executed in the control system internally on the
basis of NURBS (non-uniform rational B splines). Thus, there is a standard procedure
(SINUMERIK 840D) for all operating modes as an internal control function.
OEM
The scope of the implementation of individual solutions (OEM applications) for the
SINUMERIK 840D was developed for machine manufacturers, who want to create their own
user interfaces or who want to integrate process-oriented functions in the control system.
Online tool offset
This function can be used for grinding tools only.
The reduction in the size of the grinding wheel through dressing is transferred to the relevant
active tool as tool offset and is immediately effective.
Operating mode
Operator control concept for SINUMERIK control systems. The following modes exist: ->
JOG, -> MDA and -> AUTOMATIC.
Oriented spindle stop
Stops the spindle at a defined orientation angle, e.g., for the execution of additional
machining operation at the specified position.
Oriented tool retraction
RETTOOL: If the machining is interrupted (e.g., in case of tool breakage), the tool can be
retracted with a program command along a fixed path in an orientation defined by the user.
Override
Manually adjustable or programmable feature of the control system, with which the user can
superimpose the programmed feedrates and speeds to adjust them to his special tool or
material.
Part program
A sequence of instructions to the NC control whose combination is supposed to create a
certain -> workpiece by executing certain DO operations on a specified -> raw part.
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Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling