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G71 Rough turning cycle
Centroid CNC12 Acorn G-code · Lathe
Roughs with passes along Z, stepping in X, inside the profile from block P to Q. Ends with one rough pass along the profile. Finish with G70.
Format
G71 U R then G71 P Q [U] [W] [I] [K] F
Addresses
| Address | What it does |
|---|---|
U line 1 | Depth of cut, radius value |
R | Escape amount |
P Q | First and last block numbers of the profile |
U W | Finish stock in X and Z |
I K | Extra rough stock for the step passes |
F | Roughing feed |
How it works
One shot.
Example program
T0101 ; ROUGH TOOL
G50 S3000
G96 S500 M3
G0 X3. Z0 M8 ; START POINT
…
G50 S3000
G96 S500 M3
G0 X3. Z0 M8 ; START POINT
…
The full 10-line example is in the app. Example is in inch. Check offsets and clearances first.
Watch out for
- U is always a radius value in CNC12 G71, no matter the diameter mode.
- A one line form G71 P Q D U W I K A also works, with D as the depth of cut.
- F, S and T inside the profile are ignored while roughing.
Related codes
G71 on other controls
The same number can mean something different on another control.
| Control | Meaning |
|---|---|
| Fanuc | Stock removal in turning, rough cycle |
| Haas NGC | Bolt hole arc |
| Mazak (EIA) | OD and ID roughing cycle, Z direction |
| Okuma OSP | Return level for fixed cycles |
| Mitsubishi M70 M80 | Longitudinal rough cutting cycle |
| Siemens 840D 828D | Metric input for geometry |
| Heidenhain TNC (ISO) | Millimeter units |
| Fagor 8055 8065 | Millimeter programming |
| LinuxCNC Tormach | Lathe roughing cycle, along Z |
| Mach3 Mach4 | Metric units, Mach3 |
| Hurco WinMax (NC) | Metric input (Basic NC) |
| Fadal | Check for metric setting, older code |
| Swiss (Citizen Star) | Rough turning cycle |
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