Coordinate Systems; Machine Coordinate System (Mcs) - Siemens SINUMERIK 840D sl Programming Manual

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Fundamentals

2.1 Fundamental Geometrical Principles

Coordinate systems

A distinction is made between the following coordinate systems:

● Machine coordinate system (MCS) (Page 36) with the machine zero M

● Basic coordinate system (BCS) (Page 38)

● Basic zero system (BZS) (Page 39)

● Settable zero system (SZS) (Page 40)

● Workpiece coordinate system (WCS) (Page 41) with the workpiece zero W

The machine coordinate system comprises all the physically existing machine axes.

Reference points and tool and pallet changing points (fixed machine points) are defined in the

machine coordinate system.

If programming is performed directly in the machine coordinate system (possible with some G

commands), then the physical axes of the machine are directly addressed. Any workpiece

clamping that is present is not taken into account.

If there are various machine coordinate systems (e.g. 5-axis transformation), then an internal

transformation is used to map the machine kinematics on the coordinate system in which the

programming is performed.

Three-finger rule

The orientation of the coordinate system relative to the machine depends on the machine type.

The axis directions follow the so-called "three-finger rule" of the right hand (according to

Seen from in front of the machine, the middle finger of the right hand points in the opposite

direction to the infeed of the main spindle. Therefore:

● the thumb points in the +X direction

● the index finger points in the +Y direction

● the middle finger points in the +Z direction

Programming Manual, 12/2019, 6FC5398-2EP40-0BA0

NC programming

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Sinumerik 840de sl