Siemens SINUMERIK 828D Operating Manual page 306

Programming technological functions (cycles)
8.4 Further cycles and functions
● Axis by axis
● Projection angle
● 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
306
In the case of "axis-by-axis" swiveling, the coordinate system is rotated about each axis in
turn, with each rotation based on the previous rotation. The axis sequence can be freely
selected.
When swiveling using the "Projection angle" , the angular value of the swiveled surface is
projected onto the first two axes of the right-angled coordinate system. The user can
freely select the axis rotation sequence.
The third rotation is based on the previous rotation. The active plane and the tool
orientation must be taken into consideration when the projection angle is used:
– For G17 projection angle XY, 3rd rotation around Z
– For G18 projection angle ZX, 3rd rotation around Y
– For G19 projection angle YZ, 3rd rotation around X
When projection angles around XY and YX are programmed, the new X-axis of the
swiveled coordinate system lies in the old ZX plane.
When projection angles around XZ and ZX are programmed, the new Z-axis of the
swiveled coordinate system lies in the old Y-Z plane.
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.
For direct swiveling, the desired positions of the rotary axes are specified. HMI sl
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.
Operating Manual, 06/2009, 6FC5398-7CP20-0BA0
HMI sl Milling