High-Speed Deep Hole Drilling Cycle With Chip Breakage (G73) - Siemens SINUMERIK 808D Programming And Operating Manual

Plane for the return point (G98/G99):
Repeat
If several holes are drilled at uniform spacing, the number of repetitions is specified with "K". "K" is effective only in the block
in which it is programmed. If the drilled hole position is programmed as absolute (G90), drilling is done at the same position
again; hence the drilled hole position is to be specified as incremental (G91).
Comments
A cycle call remains active till it is deselected again with the G functions G80, G00, G01, G02 or G03 or another cycle call.
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:
4.4.1.2

High-speed 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
Programming and Operating Manual (ISO Turning/Milling)
126
01/2017