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Chapter 3 G Commands
71
Ⅰ
Programming
3.9 Polar Coordinate Interpolation G12.1, G13.1
Command format
：
G12.1----start polar coordinate interpolation method-
（
can be written to
G112
）
---
⑴
G98
G01 X C
G04 X
G41/G42 G1 X C
G6.2/G6.3 X C A B Q
G7.2/G7.3 X C A B Q --- available com
⑵
mand
G05 X C I
G02/G03 X C R
G40 G1 X C
G65/G66/G67
G13.1----cancel polar coordinate interpolation method-
（
can be written to G113
）
---
⑶
Command function:
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 method is useful in cutting a front
surface and grinding a cam shaft on the machine.
Command explanation:
G12.1, G13.1 are non-modal
Linear axis: X or Z, Y or 4
th
or 5
th
axis
Rotary axis: axes except for feed axis(Y or 4
th
or 5
th
axis)
Before starting the polar coordinate, set the linear axis and the rotary axis by No.235
and No.236.
Taking example of the linear axis X and the rotary axis 5
th
.
Polar coordinate interpolation plane: G12.1 starts the polar coordinate interpolation mode and
selects a polar coordinate interpolation plane(below), and the polar coordinates are completed in
the plane.
Fig.3-33 Polar coordinate interpolation plane
Note1: After G12.1 is used, the previous plane is cancelled and the system enters the polar coordinate
interpolation plane, and after G13.1 is used, the plane is cancelled and the previous is recovered;
Note 2
：
After the system resets, it cancels the polar coordinate interpolation and recovers the previous plane,
and the cursor returns to the beginning of the program.
Programming format:
create the rectangular coordinate system in the polar coordinate interpolation
plane below:
