Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 669)

Milling Fixed Cycles
Chapter 26
26-37
Figure 26.16
G89: Boring Cycle, Dwell/Feed Out
Cutting feed
Rapid feed
Dwell Hole bottom
R point level
Initial point
level
R
Z
1
2
3
4
5
6
In the G89 boring cycle, the control moves the axes in the following
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 will
dwell 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.