16
The distance between an arc and the center of a circle that contains the arc can be specified using the radius,
R, of the circle instead of I, J, and K. When exceed 180 °,arc radius must be designated by a negative value. If Xp,
Yp, and Zp are all omitted, namely the end point is located at the same position as the start point , and when R is
used, an arc of 0° is programmed.
An arc less than 180 °: G02 X 70. Y30. R60. F400.
An arc greater than 180 °: G02 X 70. Y30. R-60. F400.
When using the R programming instructions, the circular process has two tracks, shown in Figure 4-3:
Fig.4-3
With I, J, K program shown in Figure 4-4:
Fig. 4-4
Program Example:
G90 G54 G17 G00 X0 Y0 S1000
M03
；
Absolute coordinate program
G02 I20.0 F100
；
Full circle process, can not use the R command
G03 X-20.0 Y20.0 I-20.0
；
R20 arc, can use G03 X-20.0 Y20.0 R20.0;
X-10.0 Y10.0 J-10.0
R10 arc, can use X-10.0 Y10.0 R-10.0;
M05
；
M30
；
4.4 Helical Interpolation (G02, G03)
The tool moves, with specified feed rate by parameter F, from the current point to the specified location in a
spiral track.
Format:
