Deep Hole Drilling Cycle With Chip Breakage (G73) - Siemens Sinumerik 840D sl Programming Manual

Additional functions
4.1 Program supporting functions
Symbols and numbers
The individual fixed cycles are explained in the following sections. The following symbols are
used in the numbers occurring in these explanations:
Figure 4-4
4.1.2

Deep hole drilling cycle with chip breakage (G73)

The tool drills at the programmed spindle speed and feedrate to the entered final drilling
depth. Deep hole drilling is performed with a depth infeed of a maximum defined depth
executed several times, increasing gradually until the final drilling depth is reached.
Optionally, the twist drill can be retracted after each infeed depth either to the reference
plane + safety clearance for chip removal or by the length of the programmed retraction path
for chip breakage.
Format
G73 X.. Y... R... Q... F... K... ;
X,Y: Drilled hole position
Z: Distance from Point R to the base of the drilled hole
R: Distance from the initial plane to plane R
Q: Single drilling depth
F: Feedrate
K: Number of repetitions
78
Icons in the numbers
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
ISO Milling