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

Fundamental Geometrical Principles

2.3 Zero points and reference points

Working planes for turning/milling
Working planes for turning
Activating a work plane
The working planes are activated defined in the NC program with the G commands G17, G18
and G19. The relationship is defined as follows:
2.3 Zero points and reference points
Various zero points and reference points are defined on an NC machine:
Zero points
22
G command Working plane
X/Y
G17
Z/X
G18
Y/Z
G19
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).
Working planes for milling
Abscissa Ordinate
X Y
Z X
Y Z
Programming Manual, 01/2015, 6FC5398-1BP40-5BA2
Applicate infeed di‐
rection
Z
Y
X
Fundamentals