Siemens SINUMERIK 840D sl Turning Operating Manual page 552

Programming technology functions (cycles)
10.4 Milling
the longitudinal axis of the elongated hole changes its direction after each infeed. The cycle
searches for the shortest path when changing to the next elongated hole.
Note
The cycle requires a milling cutter with a "face tooth cutting over center" (DIN 844).
Approach/retraction
1. Using G0, the starting position for the cycle is approached. In both axes of the current 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.
2. Each elongated hole is milled in a reciprocating motion. The machining in the plane is
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.
3. Retraction to the retraction plane using G0 and approach to the next elongated hole on the
shortest path.
4. After the last elongated hole has been machined, the tool at the position reached last in the
machining plane is moved with G0 to the retraction plane, and the cycle terminated.
Procedure
Parameter Description
PL Machining plane
RP Retraction plane (abs)
SC Safety clearance (inc)
F Feedrate
Machining type
● Plane-by-plane
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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1. The part program to be executed 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, 06/2019, A5E44903486B AB
Unit
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mm
Turning