Siemens SINUMERIK 828D Operating Manual page 528

Programming technology functions (cycles)
9.5 Contour milling
Approach/retraction strategy
You can choose between planar approach/retraction and spatial approach/retraction:
● Planar approach:
Approach is first at depth and then in the machining plane.
● Spatial approach:
Approach is at depth and in machining plane simultaneously.
● Retraction is performed in reverse order.
Mixed programming is possible, for example, approach in the machining plane, retract
spatially.
Path milling along center-point path.
A programmed contour can also be machined along the center-point path if the radius
correction was switched-out. In this case, approaching and retraction is only possible along a
straight line or vertical. Vertical approach/retraction can be used for closed contours, for
example.
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.
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Operating Manual, 01/2015, 6FC5398-8CP40-5BA2
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