Rockwell Automation 8520 9/Series CNC Lathe - Manual (Page 636)

Drilling Cycles
Chapter 26
26-10
In the G81 drilling cycle, the control moves the axes in this manner:
1. The tool rapids to the initial point level above the hole location.
2. The drilling tool then rapids to the R point level, slows to the
programmed cutting feedrate and begins the drilling operation.
3. The drilling 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 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 4.
The format for the G82 cycle is:
G82X__Z__R__P__F__L__;
Where : Is :
X specifies location of the hole.
Z defines the hole bottom.
R defines the R point level.
P
defines the dwell period at hole bottom.
F
defines the cutting feedrate.
L defines the number of times the drilling cycle is repeated.
See section 27.3 for a detailed explanation of these parameters.
Important: The programmer or operator must start spindle or live tool
rotation.
(G82): Drill Cycle,
Dwell/Rapid Out