Inclined Surface Machining With 3 + 2 Axes - Siemens SINUMERIK 840D sl Function Manual

2.8.5

Inclined surface machining with 3 + 2 axes

Description of function
Inclined machining with 3 + 2 axes describes an extension of the concept of toolholders with
orientation capability and applies this concept to machines with a rotary table, on which the
orientation of tool and table can be changed simultaneously.
The "Inclined machining with 3 + 2 axes" function is used to machine surfaces with any rotation
with reference to the main planes X/Y (G17), Z/X (G18) and Y/Z (G19).
It is possible to produce any orientation of the tool relative to the workpiece by rotating either the
tool, the workpiece or both the tool and the workpiece.
The software automatically calculates the necessary compensating movements resulting from
the tool lengths, lever arms and the angle of the rotary axis. It is always assumed that the
required orientation is set first and not modified during a machining process such as pocket
milling on an inclined plane.
Furthermore, the following 3 functions are described, which are required for oblique machining:
● Position programming in the direction of the tool orientation independent of an active frame
● Definition of a frame rotation by specifying the solid angle
● Definition of the component of rotation in tool direction in the programmed frame while
maintaining the remaining frame components
Demarcation to 5-axis transformation
If the required functionality specifies that the TCP (Tool Center Point) does not vary in the event
of reorientation with reference to the workpiece, even during interpolation, the 5axis software
is required.
For more explanations on 5-axis transformations, see:
Further information
Function Manual Transformations; Multi-axis transformation
Specification of the toolholder with orientation capability
The toolholder with orientation capability is represented by a general 5axis kinematic sequence
described by a data block in the tool offset memory with a total of 33 REAL values. For
toolholders that have two rotary axes for setting the orientation (e.g. a millhead), 31 of these
values are constant.
In the current SW version, a data block in the tool offset memory is described with a total of 47
REAL values. For toolholders that have two rotary axes for setting the orientation, 45 of these
values are constant.
The remaining two values are variable and are used to specify the orientation. The constant
values describe offsets and directions and setting options for the rotary axes; the variable
values describe the angles of the rotary axes.
Tools
Function Manual, 06/2019, A5E47435126B AA
2.8 Tool carriers with orientation capability
W1: Tool offset
121