# Fanuc Power Mate i-D/H Operator Manual

PROGRAMMING
(Common to Power Mate i–D and –H)
B–63174EN/03
4. INTERPOLATION FUNCTIONS
49
Polar coordinate interpolation is a function that exercises contour control
in converting a command programmed in a Cartesian coordinate system
to the movement of a linear axis (movement of a tool) and the movement
of a rotary axis (rotation of a workpiece). This function is useful for
grinding a cam shaft.
G12.1 ;
Starts polar coordinate interpolation mode (enables polar
coordinate interpolation)
Polar coordinate interpolation mode is cancelled (for not
performing polar coordinate interpolation)
G13.1 ;
Specify linear or circular interpolation using coordinates in a
Cartesian coordinate system consisting of a linear axis and
rotary axis (hypothetical axis).
G12.1 starts the polar coordinate interpolation mode and selects a polar
coordinate interpolation plane (Fig.4.8). Polar coordinate interpolation
is performed on this plane.
Rotary axis (hypothetical axis)
(unit:mm or inch)
Linear axis
(unit:mm or inch)
Origin of the workpiece coordinate system
Fig.4.8 Polar coordinate interpolation plane.
When the power is turned on or the system is reset, polar coordinate
interpolation is canceled (G13.1).
The linear and rotation axes for polar coordinate interpolation must be set
in parameters (No.5460 and 5461) beforehand.
WARNING
The plane used before G12.1 is specified (plane selected
by G17, G18, or G19) is canceled. It is restored when G13.1
(canceling polar coordinate interpolation) is specified.
When the system is reset, polar coordinate interpolation is
canceled and the plane specified by G17, G18, or G19 is
used.
4.8
POLAR COORDINATE
INTERPOLATION
(G12.1, G13.1)
(UNAVAILABLE TO
THE Power Mate i
–D2)
Format
Specify G12.1 and G13.1
in Separate Blocks
Explanations
Polar coordinate
interpolation plane