Simulating Machining; Overview - Siemens SINUMERIK 840D sl Operating Manual

Simulating machining

7.1

Overview

During simulation, the current program is calculated in its entirety and the result is displayed
in graphical form. The result of programming is verified without moving the machine axes.
Incorrectly programmed machining steps are detected at an early stage and incorrect
machining on the workpiece is prevented.
Graphical display
In order that workpiece simulation is also possible for tools that have either not been measured
or have been incompletely entered, certain assumptions are made regarding the tool geometry.
For instance, the length of a grinding wheel or a dressing tool is set to a value proportional to
the tool radius so that cutting can be simulated.
Defining a blank
The blank dimensions that are entered in the program editor are used for the workpiece. The
blank is clamped with reference to the coordinate system that was valid when the blank was
defined. This means that before the blank is defined in G code programs, the required output
conditions must be established, e.g. by selecting a suitable zero offset.
Display of the traversing paths
The traversing paths are displayed in color. Rapid traverse is red and the feedrate is green.
Depth display
The depth infeed is color-coded. The depth display indicates the actual depth at which
machining is currently taking place. "The deeper, the darker" applies for the depth display.
Machine coordinate system references
The simulation is implemented as workpiece simulation. This means that it is not assumed that
the work offset has already been precisely scratched or is known.
In spite of this, there are unavoidable machine coordinate system references in the
programming, such as the tool change point in the machine coordinate system, the retraction
position for swiveling, and the table components of swivel kinematics. Depending on the
current work offset, in the worst case, these machine coordinate system references can mean
that collisions are shown in the simulation that would not occur with a realistic work offset, or
conversely that collisions are not shown that could occur with a realistic work offset.
Grinding
Operating Manual, 05/2017, A5E40869190
7
177