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G74 Face peck drilling and grooving cycle
Swiss (Citizen Star) G-code · Lathe
Pecks in Z on center or grooves the face. On a Swiss the headstock feeds the bar into the end working tool.
Format
G74 R | G74 X Z P Q F
Addresses
| Address | What it does |
|---|---|
R first | Retract per peck |
X | Final X, X0 for a hole on center |
Z | Final depth |
Q | Peck depth, no decimal in ten thousandths |
F | Feed |
How it works
One shot.
Example program
G00 X0. Z-.05 T0300 (CENTER DRILL ON END WORK HOLDER)
G74 R.01
G74 Z.4 Q500 F.002 (PECK DRILL .40 DEEP)
G00 Z-.1 (BACK OUT)
G74 R.01
G74 Z.4 Q500 F.002 (PECK DRILL .40 DEEP)
G00 Z-.1 (BACK OUT)
Example is in inch. Check offsets and clearances first.
Watch out for
- Q is in least increment units on most controls. Q500 is .05 inch.
Related codes
G74 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Left hand tapping cycle |
| Haas NGC | Reverse tapping cycle |
| Mazak (EIA) | Reverse tapping cycle |
| Okuma OSP | Reverse tapping cycle |
| Mitsubishi M70 M80 | Reverse tapping cycle |
| Brother Speedio | Left hand tapping cycle |
| Siemens 840D 828D | Reference point approach |
| Fagor 8055 8065 | Home search |
| LinuxCNC Tormach | Left hand tapping cycle |
| Mach3 Mach4 | Left hand tapping, Mach4 |
| Centroid CNC12 Acorn | Left hand tapping cycle |
| Hurco WinMax (NC) | Left hand tap (ISNC) or single quadrant arc (BNC) |
| Fadal | Left hand tap |
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