Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 652)

Drilling Cycles
Chapter 26
26-26
See page 26-7 for a detailed description of these parameters.
Important: The programmer or operator must start spindle or live tool
rotation.
Figure 26.10
G85: Boring Cycle (Without Dwell, Feed Out)
Hole bottom
R point level
Initial point
level
5
1
2 3
4
Cutting feed
Rapid feed
In the G85 boring cycle, the control moves the axis in this manner:
1. The tool rapids at the initial point level, to 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 continues to drill at the programmed feedrate until it
reaches the depth of the hole as programmed with the Z-word.
4. The control retracts the boring tool at the cutting feedrate to the R
point.
5. The control retracts the drilling tool 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.