Siemens sinumerik 840D sl Operating Manual page 324

Programming technology functions (cycles)
8.3 Contour turning
Feedrate interruption
To prevent the occurrence of excessively long chips during machining, you can program a
feedrate interruption.
Machining type
You can freely select the machining type (roughing or finishing).
For more detailed information, please refer to section "Stock removal".
Procedure
Parameters, G code program
PRG Name of the program to be generated
PL Machining plane
RP Retraction plane - (only for
machining direction,
longitudinal, internal)
SC Safety clearance
F Feedrate
Residual With subsequent residual material removal
material
Yes

No

CONR Name to save the updated unmachined-part
contour for residual material removal - (only
"Yes" for residual material removal)
Parameters Description
Machining 

Machining 
direction

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1. The part program or ShopTurn program to be processed has been
created and you are in the editor.
2. Press the "Contour turning" softkey.
3. Press the "Grooving" softkey.
The "Grooving" input window opens.
mm
mm
mm/min
∇ (roughing)
∇∇∇ (finishing)
Transverse
Longitudinal
Parameters, ShopTurn program
T Tool name
D Cutting edge number
F Feedrate
S / V Spindle speed or constant cutting
rate
Operating Manual, 07/2010, 6FC5398-8CP40-0BA0
mm/min
mm/rev
rpm
m/min
Unit
Turning