Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 658)

Drilling Cycles
Chapter 26
26-32
Figure 26.13
G87: Back Boring Cycle
Hole bottom Z point level
Initial point
level
Spindle or live tool
orientation
Spindle or live tool
rotation forward
Spindle or live tool
orientation
1
2
8
7
6 5
3
4
Cutting feed
Rapid feed
In the G87 back boring cycle, the control moves the axes in this manner:
1. The tool rapids to the initial point level above the hole location.
2. After the back boring tool is positioned, the control orients the tool to
a position determined in AMP by the system installer.
The control shifts the boring tool by one of two possible methods as
described on page 26-33. The shift method is determined in AMP by
the system installer. Refer to the documentation supplied by your
system installer for additional information.