Polar Coordinate Interpolation (G12.1, G13.1) - Siemens Sinumerik 802D sl Programming Manual

04.07
2.1.5

Polar coordinate interpolation (G12.1, G13.1)

The polar coordinate interpolation function allows programming of machining that is
executed by the combination of tool movement and workpiece rotation in a virtual
rectangular coordinate system.
In the machining accomplished by the combination of a linear axis and a rotary
axis, the rotary axis is assumed to be a linear axis that is perpendicular to the linear
axis. By assuming a rotary axis as a linear axis, machining an arbitrary shape that
is defined by the linear and rotary axis can be programmed easily in the rectangu-
lar coordinate system. In this programming, both of absolute commands and incre-
mental commands can be used.
Programming format
When G12.1 is specified, the polar coordinate interpolation mode is established
and the virtual coordinate system is set in the plane represented by a linear-- and a
rotary axis with the origin of the absolute coordinate system taken as the origin of
this coordinate system. Polar coordinate interpolation is executed in this plane.
Note that polar coordinate interpolation starts when G12.1 is specified assuming
the present position of the rotary axis to be "0".
Notice
Return the rotary axis to the origin of the absolute coordinate system before speci-
fying G12.1.
Features of G12.1 and G13.1
The following G codes are used to turn ON/OFF the polar coordinate interpolation
mode.
Table 2-5
G code
G12.1
G13.1
Specify G12.1 and G13.1 in a block without other commands.
G12.1 and G13.1 are modal G codes of group 21. Once G12.1 is specified, the po-
lar coordinate interpolation mode ON state remains until G13.1 is specified. When
the power is turned ON or the NC is reset, the G13.1 (polar coordinate interpolation
mode OFF) state is set.
© SIEMENS AG 2007 All rights reserved
SINUMERIK 802D sl/840D sl840D/840Di sl/840Di/810D ISO Turning -- 04.07 Edition
G codes used for turning ON/OFF the polar coordinate interpola-
tion
Polar coordinate interpolation mode ON
Polar coordinate interpolation mode OFF
Commands Calling Axis Movements
2.1 Interpolation commands
Function Group
21
21
2-35