Machining Modes - Siemens SINUMERIK 840D sl Function Manual

19.1.2

Machining modes

There are two modes for milling spatial contours:
• Circumferential milling
• Face milling
Circumferential milling mode is provided for machining so-called ruled surfaces (e.g. taper,
cylinder, etc.) while face milling is used to machine curved (sculptured) surfaces.
Circumferential milling
Tools will be applied as follows for circumferential milling:
• with space-bound orientation (2
• with variable orientation (3D TRC)
3D TRC can therefore be applied in circumferential milling only if the tool orientation is
variable.
Intermediate blocks that are required from non-tangential transitions for mathematical
reasons can be avoided using the intersection procedure. In these cases, the two curves in
question are extended; the intersection of both extended curves is approached.
Face milling
Tools of both types, i.e. with constant or variable orientation, can be used for face milling
operations.
Tools with variable orientation offer the following advantages:
• Better approximation of end contour
• Greater cutting capability
• Wider selection of tool shapes
• Wider range of surfaces can be machined (relief cuts).
Special Functions
Function Manual, 09/2011, 6FC5397-2BP40-2BA0
1
/ D TRC) and
2
W5: 3D tool radius compensation
19.1 Brief description
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