Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 631)

Drilling Cycles
Chapter 26
26-5
Figure 26.2 shows typical drilling cycle motions in absolute (G90) or
incremental (G91) mode. Note the changes in how the R point and Z level
are referenced.
Figure 26.2
Drilling Cycle Parameters in G90 and G91 Modes
Cutting feed
Rapid feed
Z
R Z
Z
R
R point level R point level
Z
G90 Absolute Mode G91 Incremental Mode
0 0