Modifications During The Rotation Of Turning Tools - Siemens SINUMERIK 828D Function Manual

Holder angle and clearance angle
The following figure depicts the two angles (holder angle and clearance angle) of a turning tool with cutting edge
position 3, that are necessary for describing the geometry of the tool cutting edge. The cut direction in this
example is 3, i.e. it denotes the negative Z direction (abscissa direction for G18).
Figure 18-45 Angle and cut direction for a turning tool with cutting edge position 3
The cut direction specifies the reference direction of the holder angle. The clearance angle is the angle measured
between the inverse cut direction and the adjacent cutting edge (positive). Holder angle and clearance angle are
stored in the tool parameters $TC_DP10 or $TC_DP24.
Note
Cut direction and tool angle are relevant only in the cutting edge positions 1 to 8.
18.7.4

Modifications during the rotation of turning tools

Tool orientation
Unlike milling tools, turning tools are not rotation-symmetric. This means that normally 3 degrees of freedom or
three rotary axes are required to describe the tool orientation. The concrete kinematics therefore, is independent
of the machine only to the extent the desired orientation can be set. If necessary, the third degree of freedom can
be substituted by a rotation of the tool coordinate system.
Note
The division of the orientation into one portion created by the tool holder with orientation
capacity, and a second portion achieved via a rotation of the coordinate system is the
responsibility of the application. The control does not provide any further functionality in this
regard.
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
18.7 Cutting data modification for tools that can be rotated
W1: Tool offset
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