Siemens SINUMERIK 840D Operating Manual page 318

Programming technological functions (cycles)
8.2 Milling
Approach/retraction
1. Using G0, the starting position for the cycle is approached. In both axes of the current
2. Each elongated hole is milled in a reciprocating motion. The machining in the plane is
3. Retraction to the retraction plane using G0 and approach to the next elongated hole on
4. After the last elongated hole has been machined, the tool at the position reached last in
Procedure
Parameters Description
PL Machining plane
RP Retraction plane (abs)
SC Safety clearance (inc)
F Feedrate
Plane by plane
Machining type 
The tool is inserted to infeed depth in the pocket center.
Note: This setting can be used only if the cutter can cut across center.
Oscillating

Insert with oscillation along center axis of longitudinal slot:
The cutter center point oscillates along a linear path until it reaches the depth
infeed. When the depth has been reached, the path is traversed again without
depth infeed in order to eliminate the inclined insertion path.
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plane, the closest end point of the first elongated hole to be machined is approached at
the level of the retraction plane in the tool axis and then lowered to the reference point
shifted by the amount of the safety clearance.
performed using G1 and the programmed feedrate. At each reversal point, the infeed to
the next machining depth calculated internally in the cycle is performed with G1 and the
feedrate, until the final depth is reached.
the shortest path.
the machining plane is moved with G0 to the retraction plane, and the cycle terminated.
1. The part program or ShopMill program to be processed has been
created and you are in the editor.
2. Press the "Milling" softkey.
3. Press the "Groove" and "Elongated hole" softkeys.
The "Elongated Hole" input window opens.
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Unit
mm/min
mm
Milling