Face Milling; Cutter Shapes - Siemens sinumerik 840D sl Function Manual

Detailed description

2.2 Face milling

2.2 Face milling
The face milling function allows surfaces with any degree or form of curvature to be
machined. In this case, the longitudinal axis of the tool and the surface normal vector are
more or less parallel. In contrast, the longitudinal axis and the surface normal vector of the
surface to be machined in a circumferential milling operation are at right angles to one
another.
Information about the surfaces to be machined is absolutely essential for face milling
operations, i.e. a description of the linear path in space is not sufficient. The tool shape must
also be known in order to implement the tool offset (the term "Tool radius compensation" is
not appropriate in this case).
The relations in face milling are shown in the Figure below.
Figure 2-11
2.2.1

Cutter shapes

The following table lists the possible tool shapes that may be used for face milling with their
dimensions.
Table 2-1
Cutter type
Ball end mill (cylindrical die sinker)
Ball end mill (tapered die sinker)
End milling cutter without corner rounding
End mill with corner rounding (torus)
Bevel cutter without corner rounding
Bevel cutter with corner rounding
If a tool number other than any of those specified in the table above is used in the NC
program, then the tool type is assumed to be a ball end mill (tool type 110). Tool parameters
marked with an X in the tool table are not evaluated. A value other than zero is meaningless
for the tool offset for face milling.
An alarm is output if tool data are programmed that violate the limits specified in the table
above.
20
Face milling with a torus
Tool shapes for face milling
Tool No. d
110 >0
111 >0
120, 130 >0
121, 131 >r
155 >0
156 >r
Special functions: 3D Tool Radius Compensation (W5)
Function Manual, 11/2006, 6FC5397-2BP10-2BA0
r a
X X
>d X
X X
>0 X
X >0
>0 >0