Siemens Sinumerik 840D sl Programming Manual page 104

Additional functions
4.1 Program supporting functions
Format
G84 (or G74) X... Y... Z... R... P... Q... F... K... ;
X,Y: Drilled hole position
Z: Distance from point R to the bottom of the hole
R: Distance from the initial plane to "Point R"
P: Dwell time at the bottom of the hole and at point R during return
Q: Cutting depth for each cutting feedrate
F: Feedrate
K: Number of repetitions
Figure 4-16
104
Deep hole tapping with chip breakage (GUD7 _ZSFI[1] = 2)
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling