Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 637)

Drilling Cycles
Chapter 26
26-11
Figure 26.5
G82: Drilling Cycle, Dwell/Rapid Out
5
Z
3 4
R
2
1
initial point
level
R point level
Hole bottom
Dwell at hole bottom
Cutting feed
Rapid feed
In the G82 drilling cycle, the control moves the axes in this manner:
1. The tool rapids to initial point level point above the hole location.
2. The drilling tool then rapids to the R point level, slows to the
programmed cutting feedrate and begins the drill operation.
3. The cutting tool drills at the programmed feedrate to the
pre-programmed depth of the hole (defined by the Z-word in the
boring cycle block).
4. If a value was programmed for the P parameter, the drilling tool
dwells after it reaches the bottom of the hole.
5. After the drilling tool reaches the hole bottom and the dwell is
completed, the drilling tool is retracted at a rapid feedrate to the
initial point level as determined by G98.
When the single block function is active, the control stops axis motion
after steps 1, 2 and 5.