Drilling A Left-Hand Thread Without Compensating Chuck" Cycle (G74) - Siemens Sinumerik 840D sl Programming Manual

G00 X100.0 Y100.0
G84 Z-50.0 R-10.0 F1.0
4.1.12

"Drilling a left-hand thread without compensating chuck" cycle (G74)

The tool drills at the programmed spindle speed and feedrate to the entered final thread
depth. With G74 you can produce left rigid tapping.
Note
G74 can be used if the spindle to be used for the drilling operation is technically able to be
operated in the position-controlled spindle mode.
Format
G74 X... Y... Z... R... P... 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
F: Cutting feedrate
K: Number of repetitions (if necessary)
Figure 4-15
ISO Milling
Programming Manual, 06/09, 6FC5398-7BP10-1BA0
"Drilling a left-hand thread without compensating chuck" cycle (G74)
;then return to initial plane
;Positioning
;Tapping without compensating chuck
Additional functions
4.1 Program supporting functions
101