Rockwell Automation 8520-MUM 9/Series CNC Mill Operation and Programming Manual Documentation Set - Manual (Page 641)

Milling Fixed Cycles
Chapter 26
26-9
The format for the G73 cycle is as follows:
G73X__Y__Z__R__Q__P__F__L__;
Where : Is :
X,Y specifies the location of the hole position in the selected plane.
Z defines the hole bottom.
R defines the R point level.
Q defines the infeed amount for each step into the hole.
P defines the dwell period at hole bottom.
F defines the cutting feedrate.
L defines the number of times the milling fixed cycle is repeated.
(See section 26.3 for a detailed description of these parameters.)
Important: The programmer or operator must start spindle rotation.
Figure 26.4
G73: Deep Hole Peck Drilling Cycle with Dwell
Moves to hole bottom
when Q is larger than
remaining depth
Hole bottom
R point level
Initial point
level
R
Q
d
Q
d
1
2
3
4
5
6
7
In the G73 peck 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. During the drilling operation, the control infeeds the drilling tool by
an amount Q, as programmed in the drilling cycle.
(G73): Deep Hole Peck
Drilling Cycle with Dwell