Parallel Axes (G17, G18, G19) - Siemens Sinumerik 840D sl Programming Manual

Motion commands
3.1 The coordinate system
● The Plane X-Y (G17) is selected automatically after activating the control system.
● The command for moving an individual axis can be specified independently of the plane
● The plane in which the tool radius compensation is executed with G41 or G42 is defined
3.1.8

Parallel axes (G17, G18, G19)

An axis located parallel to one of the three main axes of the coordinate system can be
activated by using the function G17 (G18, G19) <Axis name>.
The three main axes are, e.g., X, Y and Z.
Example
G17 U0 Y0
The parallel axis U is activated when the X axis in the G17 plane is replaced.
Explanations
● An associated parallel axis can be defined for each geometry axis with machine data
● Only geometry axes from a plane defined with (G17, G18, G19) can be replaced.
● On replacing the axes, normally all shifts (frames) - with the exception of the handwheel
● Details are available in the machine data description.
● Alarm 12726 "Impermissible plane selection with parallel axes" is output if a main axis is
42
selection by G17, G18 or G19. Thus for instance, the Z axis can be shifted by specifying
"G17 Z ....;".
by specifying G17, G18 or G19.
$MC_EXTERN_PARALLEL_GEOAX[ ].
and external shifts, the working area limitation and the protection areas - are deleted. The
following machine data is to be set to prevent the values from being deleted:
Shifts (frames)
$MN_FRAME_GEOAX_CHANGE_MODE
Protection areas
$MC_PROTAREA_GEOAX_CHANGE_MODE
Working area limitation
$MN_WALIM_GEOAX_CHANGE_MODE
programmed along with the associated parallel axis with a command for selecting the
plane.
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling