
B-63944EN/02 PROGRAMMING 4.INTERPOLATION FUNCTIONS
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- Shifting the coordinate system in polar coordinate interpolation
In the polar coordinate interpolation mode, the workpiece coordinate
system can be shifted. The current position display function shows the
position viewed from the workpiece coordinate system before the shift.
The function to shift the coordinate system is enabled when bit 2 of
parameter No. 5450 is specified accordingly.
The shift can be specified in the polar coordinate interpolation mode,
by specifying the position of the center of the rotary axis C (A, B) in
the X-C (Y-A, Z-B) interpolation plane with reference to the origin of
the workpiece coordinate system, in the following format.
G12.1 X_ C_ ; (Polar coordinate interpolation for the X-axis and C-axis)
G12.1 Y_ A_ ; (Polar coordinate interpolation for the Y-axis and A-axis)
G12.1 Z_ B_ ; (Polar coordinate interpolation for the Z-axis and B-axis)
X
C
x
c
Center of C-axis
G12.1 Xx Cc ;
Origin of workpiece
coordinate system
Limitation
- Changing the coordinate system during polar coordinate interpolation
In the G12.1 mode, the coordinate system must not be changed (G92,
G52, G53, relative coordinate reset, G54 through G59, etc.).
- Cutter or tool nose radius compensation
The polar coordinate interpolation mode (G12.1 or G13.1) cannot be
started or terminated in the cutter or tool nose radius compensation
mode (G41 or G42). G12.1 or G13.1 must be specified in the cutter
or tool nose radius compensation canceled mode (G40).
- Tool length offset command
Tool length offset must be specified in the polar coordinate
interpolation cancel mode before G12.1 is specified. It cannot be
specified in the polar coordinate interpolation mode. Furthermore, no
offset values can be changed in the polar coordinate interpolation
mode.
- Tool offset command
A tool offset must be specified before the G12.1 mode is set. No
offset can be changed in the G12.1 mode.