Siemens Sinumerik 840D sl Programming Manual page 44

Motion commands
3.1 The coordinate system
● By specifying G17 (or G18, G19) G68 X... Y... R... ; " the commands specified in the
Figure 3-6
● The deselection of the coordinate system rotation takes place through G69.
● G68 is executed in the plane that was selected through G68. The 4th and 5th axes must
Additions to the commands for rotating the coordinate systems
● To rotate a coordinate system, MD28081 $MC_MM_NUM_BASE_FRAMES must be set
● If "X" and "Y" are omitted, the current position is used as the rotation center for the
● The positional data for the rotation of a coordinate system are specified in the rotated
● If you program a change of plane (G17 to G19) after a rotation, the angles of rotation
44
following blocks are rotated by the angle specified with R around the point (X, Y). The
angle of rotation can be specified in units of 0.001 degree.
Rotation of a coordinate system
be linear axes.
G17: X-Y plane
G18: Z-X plane
G19: Y-Z plane
to a value of >= 3.
coordinate rotation.
coordinate system.
programmed for the axes are retained and continue to apply in the new working plane. It
is therefore advisable to deactivate the rotation before a change of plane.
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling