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

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.
The retraction for a cycle ends at the safety clearance. Only the subsequent cycle moves to
the retraction plane. This enables a special approach/retraction cycle to be used.
Note
When selecting the traversing paths, the tool tip is always taken into account; i.e. the tool
expansion is not considered. Therefore, you should ensure that the retraction planes are an
appropriate distance away from the workpiece.
Turning
Operating Manual, 05/2017, A5E40868721
Creating a ShopTurn program
9.4 Fundamentals
243