G71 OD and ID roughing cycle, Z direction

Mazak (EIA) G-code · Lathe

Roughs the profile between P and Q with cuts along Z. The two block format gives depth of cut and retract in the first block and the profile and finish stock in the second.

Format

G71 U R then G71 P Q U W F

Addresses

Address	What it does
`U first block`	Depth of cut per side
`R`	Retract amount
`P Q`	First and last block of the profile
`U second block`	Finish stock in X, on diameter. Negative for ID
`W`	Finish stock in Z
`F`	Roughing feed

How it works

Non-modal.

Example program

T0101 (OD ROUGH TOOL)
G50 S2500 (RPM CLAMP)
G96 S600 M03 (600 SFM)
G00 X1.6 Z.1 M08 (START POINT)
…

The full 10-line example is in the app. Example is in inch. Check offsets and clearances first.

Watch out for

U means two different things in the two blocks.
The first profile block must move X only on a Type 1 profile.
Use a negative U finish stock for ID roughing.

Related codes

G70 · G72

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
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
Centroid CNC12 Acorn	Rough turning cycle
Hurco WinMax (NC)	Metric input (Basic NC)
Fadal	Check for metric setting, older code
Swiss (Citizen Star)	Rough turning cycle

Every G-code for Mazak (EIA) 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 G71 in the app All Mazak G-codes

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