Siemens SINUMERIK 840D Operating Manual page 410

Programming technological functions (cycles)
8.6 Further cycles and functions
When projection angles around YZ and ZY are programmed, the new Y-axis of the swiveled
coordinate system lies in the old X-Y plane.
● directly
Note
Direction of rotation
The positive direction of each rotation for the different swivel versions is shown in the
help displays.
Axis sequence
Sequence of the axes which are rotated around:
XYZ or XZY or YXZ or YZX or ZXY or ZYX
Direction (minus/plus)
Direction reference of traversing direction of rotary axis 1 or 2 of the active swivel data set
(machine kinematics). The NC calculates two possible solutions of the rotation / offset
programmed in CYCLE800 using the angle traversing range of the rotary axes of the
machine kinematics. Usually, only one of these solutions is technologically suitable. The
solutions differ by 180 degrees in each case. Selecting the "minus" or "plus" direction
determines which of the two possible solutions is to be applied.
● "Minus" → Lower rotary axis value
● "Plus" → Higher rotary axis value
Also in the basic setting (pole setting) of the machine kinematics, the NC calculates two
solutions and these are approached by CYCLE800. The reference is the rotary axis that was
set as direction reference when commissioning the "swivel" function.
If one of the two positions cannot be reached for mechanical reasons, the alternative position
is automatically selected irrespective of the setting of the "Direction" parameter.
Example:
● Machine kinematics with swivel head and swivel table.
● Angular traversing range of rotary axis B from -90 to +90 degrees.
● Swivel table with rotary axis 2 (C) rotates around machine axis Z.
● Angle traversing range of rotary axis 2 (C) from 0 to 360 degrees (modulo 360).
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For direct swiveling, the required positions of the rotary axes are specified. The HMI
calculates a suitable new coordinate system based on these values. The tool axis is
aligned in the Z direction. You can derive the resulting direction of the X and Y axis by
traversing the axes.
Machine manufacturer
Please refer to the machine manufacturer's specifications.
Swivel head with rotary axis 1 (B) rotates around machine axis Y.
Operating Manual, 03/2010, 6FC5398-7CP20-1BA0
Milling