Siemens SINUMERIK 840D sl Operating Manual

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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 betweenthe inner or outer surface for this purpose.Face YThe face Y machining plane corresponds to the X/Y plane (G17). You can use the face surfacemachining with a Y axis for drilling and milling if, for instance, you want to mill a pocket on theface 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 doesnot influence the machining position with respect to the workpiece. The parameter only servesto position the workpiece with rotary axis C, so that the workpiece can be machined on themachine. This is required for machines where the traversing path is restricted in the X axis.Peripheral surface YThe peripheral Y machining plane corresponds to the Y/Z plane (G19). You can use peripheralsurface machining with a Y axis for drilling and milling if, for instance, you want to mill a pocketwith a flat base on the peripheral surface or drill holes that do not point to the center. You canchoose between the inner or outer surface for this purpose.Using parameter C0, you can define the position of the surface to be machined with respectto the workpiece itself. Before machining, the workpiece is appropriately positioned using rotaryC.9.4.2 Machining cycle, approach/retractionApproaching and retracting during the machining cycle always follows the same pattern if youhave 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 tothe retraction plane. This enables a special approach/retraction cycle to be used.NoteWhen selecting the traversing paths, the tool tip is always taken into account; i.e. the toolexpansion is not considered. Therefore, you should ensure that the retraction planes are anappropriate distance away from the workpiece.Creating a ShopTurn program9.4 FundamentalsTurningOperating Manual, 05/2017, A5E40868721 243