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G73 High speed peck drilling / Pattern repeating roughing cycle
Mazak (EIA) G-code · Mill, Lathe
On mills: High speed peck drilling
Pecks down by Q with a small retract after each peck to break the chip. Faster than G83 because the tool does not come back to R.
Format
Addresses
| Address | What it does |
|---|---|
X Y | Hole position |
Z | Hole bottom |
R | R plane |
Q | Peck depth |
F | Feed rate |
K | Repeat count |
How it works
Modal, canned cycle group. Cancel with G80.
Example program
G90 G54 G00 X1. Y1. S3000 M03 (FIRST HOLE)
G43 H04 Z1. M08 (LENGTH OFFSET)
G99 G73 Z-.6 R.1 Q.1 F12. (PECK .1 DEEP)
…
The full 6-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- Chips stay in the hole. For holes deeper than about 3 times diameter use G83.
- The small retract amount is a parameter, not a program address.
On lathes: Pattern repeating roughing cycle
Repeats the finish profile offset by a shrinking amount. Use it for forgings and castings that already follow the part shape.
Format
Addresses
| Address | What it does |
|---|---|
U W first block | Total stock to remove in X and Z |
R | Number of passes |
P Q | Profile blocks |
U W second block | Finish stock |
F | Feed rate |
How it works
Non-modal.
Example program
G00 X2.2 Z.2 M08 (START POINT)
G73 U.1 W.05 R3 (3 PASSES)
G73 P50 Q60 U.02 W.005 F.01 (PROFILE)
…
The full 8-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- On bar stock it cuts a lot of air. Use G71 instead.
- On a Mazak mill G73 is a peck drill cycle.
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 |
| 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 |
| LinuxCNC Tormach | Chip breaking drill cycle |
| 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 |
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Open G73 in the app All Mazak G-codes