Siemens SINUMERIK 808D Programming And Operating Manual page 29

The commands G12.1 and G13.1 may not be programmed together with other commands in a block.
The commands G12.1 and G13.1 act modally and belong to the G group 21. In case of G12.1 the polar coordinates
interpolation remains active during the process that G13.1 is programmed. Closed position or after NC RESET G13.1 is
active (polar coordinates interpolation is deactivated).
Restrictions during the selection
● An intermediate traversing block is not inserted (chamfers/radii).
● A spline block sequence must be concluded.
● An active tool-length offset must be deselected.
● An activated tool radius compensation is incorporated into the transformation in the geometry axis by the control system.
● The frame that was active before TRANSMIT is deselected by the control system (corresponds to programmed frame
reset G500 in Siemens mode).
● An active working area limitation is deselected by the control system for the axes affected by the transformation
(corresponds to programmed WALIMOF in Siemens mode).
● Continuous path mode and rounding are interrupted.
● Possibly active DRF offsets in transformed axes must have been deleted by the operator.
● No geometry axis interchange may be active (parallel axes with G17 (G18, G19)).
Restrictions for the polar coordinates interpolation
● Tool change:
Before a tool change, a tool radius compensation must be deselected!
● Work offset:
All statements, which refer exclusively to the basic coordinate system, are permissible (FRAME, tool radius
compensation). Unlike the procedure for inactive transformation, however, a frame change with G91 (incremental
dimension) is not specially treated. The increment to be traversed is evaluated in the workpiece coordinate system of the
new frame – regardless of which frame was effective in the previous block.
● Rotary axis:
The rotary axis cannot be programmed as it is occupied by a geometry axis and thus cannot be programmed directly as
channel axis.
Programming and Operating Manual (ISO Turning/Milling)
01/2017
29