Zero Points And Reference Points - Siemens SINUMERIK 840D sl Programming Manual

Fundamentals
2.1 Fundamental Geometrical Principles
Machining planes for turning/milling
Machining planes for turning
Activating a machining plane
The machining planes are activated in the NC program using G commands G17, G18 and G19.
The relationship is defined as follows:
2.1.3

Zero points and reference points

Various zero points and reference points are defined on an NC machine:
Zero points
34
G command Machining plane
G17 X/Y
G18 Z/X
G19 Y/Z
M Machine zero
The machine zero defines the machine coordinate system (MCS). All other reference
points refer to the machine zero.
W Workpiece zero = program zero
The workpiece zero defines the workpiece coordinate system in relation to the machine
zero.
A Blocking point
Can be the same as the workpiece zero (only for lathes).
Machining planes for milling
Abscissa Ordinate
X Y
Z X
Y Z
Programming Manual, 12/2019, 6FC5398-2EP40-0BA0
Applicate ≙ infeed
direction
Z
Y
X
NC programming