Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 661)

Drilling Cycles
Chapter 26
26-35
Figure 26.14
G88: Boring Cycle, Spindle Stop/Manually Out
R point level
Initial point
level
Hole bottom
Cycle start
Spindle rotation in
the forward direction
6 5
7
1
R
2
Z 3
4
Spindle or live tool stops at
hole bottom after dwell
Cutting feed
Rapid feed
Manual operation
In the G88 boring cycle, the control moves the axis in this manner:
1. The tool rapids to the initial point level above the hole location.
2. The boring tool then rapids to the R point level, slows to the
programmed cutting feedrate and begins the boring operation.
3. The boring tool bores at the programmed feedrate until it reaches the
depth specified with the Z-word.
4. If the user has entered a value for the P parameter, the boring tool
dwells after it reaches the bottom of the hole.
5. After the tool reaches the Z depth, the spindle or live tool stops
revolving. At this point, the operator must perform a manual
retraction of the drilling axis as described in chapter 4. (Press
<CYCLE START> to return the control to automatic mode.)