Siemens SINUMERIK 840D sl Operating Manual page 455

Approach/retraction
1. The tool approaches the starting point at rapid traverse at the height of the retraction plane
and is fed in to the safety clearance. The starting point is always on the positive X axis.
2. The tool approaches the spigot contour sideways in a semicircle at machining feedrate.
The tool first executes infeed at machining depth and then moves in the plane. The circular
spigot is machined depending on the programmed machining direction (up-cut/down-cut)
in a clockwise or counterclockwise direction.
3. When the circular spigot has been traversed once, the tool retracts from the contour in a
semicircle and then infeed to the next machining depth is performed.
4. The circular spigot is approached again in a semicircle and traversed once. This process
is repeated until the programmed spigot depth is reached.
5. The tool moves back to the safety clearance at rapid traverse.
Machining type
You can select the machining mode for milling the circular spigot as follows:
● Roughing
Roughing involves moving round the circular spigot until the programmed finishing
allowance has been reached.
● Finishing
If you have programmed a finishing allowance, the circular spigot is moved around until
depth Z1 is reached.
● Chamfering
Chamfering involves edge breaking at the upper edge of the circular spigot.
Procedure
Turning
Operating Manual, 05/2017, A5E40868721
1. The part program or ShopTurn program to be processed has been cre‐
ated and you are in the editor.
2. Press the "Milling" softkey.
3. Press the "Multi-edge spigot" and "Circular spigot" softkeys.
The "Circular Spigot" input window opens.
Programming technology functions (cycles)
10.4 Milling
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