Oblique Machining With 3 + 2 Axes - Siemens SINUMERIK 828D Function Manual

Explanation
The toolholder kinematic chosen in the example is such that the two rotary axes form an angle of 45 degrees,
which means that the orientation cannot take just any value. In concrete terms, this example does not permit the
display of orientations with negative X components.
x component of the tool base dimension:
y component of the tool base dimension:
z component of the tool base dimension:
Note
The required data cannot be determined unequivocally from the geometry of the toolholder,
i.e. the user is free to a certain extent to decide the data to be stored. Thus, for the example,
it is possible to specify only one z component for the tool base dimension up to the second
axis. In this case, l
distance between this point on the second axis and a further point on the first axis. The point
on the first axis can also be selected freely. Depending on the point selected, l
selected such that the reference point (which can also be selected freely) is reached.
In general: vector components that are not changed by rotation of an axis can be distributed
over any vectors "before" and "after" rotation.
18.6.3

Oblique 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
Basic Functions
Function Manual, 09/2011, 6FC5397-0BP40-2BA0
would no longer be zero, but would contain the components of the
2
18.6 Toolholder with orientation capability
0
0
250
W1: Tool offset
must be
1
1511