Siemens SINUMERIK 840D sl Operating Manual page 242

Creating a ShopTurn program
9.4 Fundamentals
Additional Y axis
For lathes with an additional Y axis, the machining planes are expanded to include two more
planes:
● Face Y
● Peripheral surface Y
Therefore, the face and peripheral planes are called Face C and Peripheral C.
Inclined axis
If the Y axis is an inclined (oblique) axis (i.e. the axis is not perpendicular to the others), you
can also select the "Face Y" and "Peripheral Y" machining planes and program the traversing
movements in Cartesian coordinates. The control system then automatically transforms the
programmed traversing movements of the Cartesian coordinate system into the traversing
movements of the inclined (oblique) axis.
The CNC-ISO function "Oblique Axis" (Traang) is required for the purpose of transforming the
programmed traversing movements.
This function is a software option.
Selecting the machining plane
The machining plane selection is integrated into the parameter screen forms of the individual
drilling and milling cycles. For turning cycles and for "axial drilling" and "axial threads", the
turning plane is automatically selected. For the "straight" and "circle" functions, you must
specify the machining plane separately.
The settings for the machining plane always act modally, i.e. until you select another plane.
The machining planes are defined as follows:
Turning
The turning machining plane corresponds to the X/Z plane (G18).
Face/Face C
The Face/Face C machining plane corresponds to the X/Y plane (G17). For machines without
a Y axis, however, the tools can only move in the X/Z plane. The X/Y coordinates that have
been entered are automatically transformed into a movement in the X and C axis.
You can use face surface machining with a C axis for drilling and milling if, for instance, you
want to mill a pocket on the face surface. You can choose between the forward or rear face
surface for this purpose.
Peripheral surface/Peripheral C
The Peripheral/Peripheral C machining plane corresponds to the Y/Z plane (G19). For
machines without a Y axis, however, the tools can only move in the Z/X plane. The Y/Z
coordinates that you entered are automatically transformed into a movement in the C and Z
axes.
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Operating Manual, 05/2017, A5E40868721
Turning