Machining Cycle, Approach/Retraction - Siemens SINUMERIK 840D sl Turning Operating Manual

Creating a ShopTurn program
9.4 Fundamentals
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.
You can use peripheral surface machining with a C axis for drilling and milling if, for instance,
you want to mill a slot with constant depth on the peripheral surface. You can choose between
the inner or outer surface for this purpose.
Face Y
The face Y machining plane corresponds to the X/Y plane (G17). You can use the face surface
machining with a Y 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.
With parameter CP, you can define the position of the face surface before machining. CP does
not influence the machining position with respect to the workpiece. The parameter only serves
to position the workpiece with rotary axis C, so that the workpiece can be machined on the
machine. This is required for machines where the traversing path is restricted in the X axis.
Peripheral surface Y
The peripheral Y machining plane corresponds to the Y/Z plane (G19). You can use peripheral
surface machining with a Y axis for drilling and milling if, for instance, you want to mill a pocket
with a flat base on the peripheral surface or drill holes that do not point to the center. You can
choose between the inner or outer surface for this purpose.
Using parameter C0, you can define the position of the surface to be machined with respect to
the workpiece itself. Before machining, the workpiece is appropriately positioned using rotary
C.
9.4.2

Machining cycle, approach/retraction

Approaching and retracting during the machining cycle always follows the same pattern if you
have not defined a special approach/retraction cycle.
If your machine has a tailstock, you can also take this into consideration when traversing.
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Operating Manual, 06/2019, A5E44903486B AB
Turning