Siemens SINUMERIK 840D sl Turning Operating Manual page 578

Programming technology functions (cycles)
10.5 Contour milling
Machining type
You can select the machining mode (roughing, finishing, or chamfer) for path milling. If you want
to "rough" and then "finish", you have to call the machining cycle twice (Block 1 = roughing,
Block 2 = finishing). The programmed parameters are retained when the cycle is called for the
second time.
It is also possible to choose between machining the contour with a cutter radius offset or
traversing on the center-point path.
Slot side compensation
When you mill a contour on the peripheral surface (peripheral machining surface C), you can
work with or without a slot wall compensation.
● Slot side compensation off
ShopTurn creates slots with parallel walls when the tool diameter is equal to the slot width.
If the slot width is larger than the tool diameter, the slot walls will not be parallel.
● Slot side compensation on
ShopTurn creates slots with parallel walls also when the slot width is larger than the tool
diameter. If you want to work with a slot wall compensation, you must not program the
contour of the slot, but instead the imagined center path of a bolt inserted in the slot whereby
the bolt touches both walls. Parameter D is used to specify the slot width.
Note
When working with slot side compensation, you have to program the path from the starting
point to the end point and the path from the end point to the starting point.
Procedure
Parameters, G code program
PL Machining plane
RP Retraction plane
SC Safety clearance
F Feedrate
578
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 "Contour milling" and "Path milling" softkeys.
The "Path Milling" input window opens.
mm
mm
*
Parameters, ShopTurn program
T Tool name
D Cutting edge number
F Feedrate
S / V Spindle speed or constant cutting
rate
Operating Manual, 06/2019, A5E44903486B AB
mm/min
mm/tooth
rpm
m/min
Turning