Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 663)

Drilling Cycles
Chapter 26
26-37
Figure 26.15
G89: Boring Cycle, Dwell/Feed Out
R point level
Hole bottom
R Z
1
2 3
Dwell
4
5 6
Cutting feed
Rapid feed
Initial point
level
In the G89 boring cycle, the control moves the axes in this manner:
1. The tool rapids to 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 of the hole specified by 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. The control retracts the boring tool at the cutting feedrate to the R
point level.
6. The boring tool accelerates to the rapid feedrate and retracts to the
initial point level.
When the single block function is active, the control stops axis motion
after steps 1, 2 and 5.