Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 388)

Using QuickPath Plus
Chapter 15
15-8
Linear to Circular blocks
When the coordinates of the intersection of a linear path into a circular
path are unknown, use the following format. G13 or G13.1 must be
programmed. These blocks must be programmed in absolute.
Format:
G13G01 ,A__; or G13G01 ,A__;
G02 Z__X__K__I__; G02 Z__X__R__;
Important: If the second block is an arc and it is programmed by using I,
and K integrand, the values programmed with I, and K are not measured
from the start point of the arc as normally done. This is because the start
point of the arc is normally unknown when using this format. The
integrands specify the distance from the end point of the arc to the center
point.
Example 15.4
Line Into Arc Without Programming Intersection
G00Z25.X0.;
G01G13.1,A90;
G03Z7.X15.K9.21I-2.;
Figure 15.5
Results Of Line into Arc Without Intersection, Example 15.4
X
Z
135 °
90 °
K
I
20
15
10
5
5 10 15 20 25
R 10.0
Important: You cannot program R to specify the arc radius for
linear-to-circular block combinations unless the two tool paths are tangent.