Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 417)

Spindles
Chapter 17
17-19
Where : Is :
q The angle to be programmed for the virtual C axis.
L The length of the arc along the circumference of the cylinder, as required to
define a legal endpoint for the arc programmed in the G02/G03 block.
R
The radius at which the feed axis is positioned. This is the active R value
programmed in the initial G16.1 block, not the R radius for the G02/G03 block.
Figure 17.4
Results of Cylindrical Interpolation, Example 17.2
X
Z
Arc radius
of 8
20
25
(R)
28
N2
N3
N4 N5