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G73 Chip breaking drill cycle
LinuxCNC Tormach G-code · Mill
Pecks to depth Q at a time, backing up only .010 inch to break the chip, then rapids out at the bottom.
Format
G73 X Y Z R Q [L] F
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Hole bottom |
R | Retract plane where feed starts |
L | Repeat count, used with G91 |
F | Feed rate |
Q | Peck depth, positive |
How it works
Modal, motion group. Cancel with G80 or another motion code.
Example program
G20 G17 G40 G49 G54 G80 G90 G94 (INCH, SAFE START)
T2 M6 G43 (.250 DRILL)
S2500 M3 M8
G0 X1 Y1 Z0.5
…
T2 M6 G43 (.250 DRILL)
S2500 M3 M8
G0 X1 Y1 Z0.5
…
The full 7-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Chips are not cleared from the hole. For deep holes use G83.
- Q must be positive.
- L repeats the hole. In G91 each repeat steps by X Y. L0 is not allowed.
Related codes
G73 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | High speed peck drilling |
| Haas NGC | High speed peck drilling cycle |
| Mazak (EIA) | High speed peck drilling |
| Okuma OSP | High speed deep hole drilling |
| Mitsubishi M70 M80 | High speed peck drilling |
| Brother Speedio | High speed peck drilling |
| Heidenhain TNC (ISO) | Rotation of the coordinate system |
| Fagor 8055 8065 | Pattern rotation |
| Mach3 Mach4 | High speed peck drill |
| Centroid CNC12 Acorn | High speed peck drilling cycle |
| Hurco WinMax (NC) | High speed peck drilling |
| Fadal | Peck drill, chip break |
| Swiss (Citizen Star) | Pattern repeat cycle |
Every G-code for LinuxCNC Tormach in your pocket. The app has the full example programs, search by number or shop word, a line decoder and calculators for tapping, threading and drilling.
Open G73 in the app All LinuxCNC Tormach G-codes