Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 386)

Axis Motion
Chapter 14
14-10
G02 or G03 may also be used to perform helical interpolation.
Figure 14.7 shows how a part may be cut with helical interpolation.
Figure 14.7
Helical Interpolation (G02, G03)
(End cam)
Use G02 or G03 to add a third axis to the circular interpolation command
block. The direction of the helical interpolation that results depends on
whether a G02 or G03 was used. Refer to Figure 14.8.
14.1.4
Helical Interpolation Mode
(G02, G03)