G71: Lathe roughing cycle

Longitudinal roughing cycle on the lathe.

For reference only: syntax changes with the control, the post-processor and the machine parameters. Check the official manual and run a simulation before cutting. Legal notice.

Family: Lathe cycles
Machine: Turning, Mill-turn
Risk: High
Example: G71 U2 R0.5

G71

Lathe cycles

Lathe roughing cycle

E.g.:

G71 U2 R0.5

Parameters

U (1er bloque): Profundidad de cada pasada de desbaste, en radio. · mm
R (1er bloque): Retroceso de la herramienta al final de cada pasada. · mm
P Q (2º bloque): Números de bloque N donde empieza (P) y termina (Q) el perfil de acabado.Fanuc usa dos bloques G71; Haas los junta en uno con P Q U W D.
U W (2º bloque): Creces para el acabado en X (U, en diámetro) y en Z (W). · mm
D: Profundidad de pasada en Haas (equivale a la U del 1er bloque Fanuc). · mm, en radio
F S T: Avance, velocidad y herramienta del desbaste. Los F del perfil se ignoran en el desbaste y se usan en G70.

Machine: Turning, Mill-turnRisk: High

Fanuc

G71 U... R... / G71 P... Q... U... W... F...

There are one and two line formats depending on control.

Haas

G71 P... Q... D... F...

Haas can differ from Fanuc in letters and format.

Siemens

CYCLE95

Siemens uses turning cycles such as CYCLE95.

Fagor

Ciclos fijos de torneado Fagor

Consult manual for control generation.

Other codes in Lathe cycles

G76 Lathe threading cycle G74/G75 Deep drilling and grooving on the lathe G32 Simple lathe threading G92 torno Simple lathe threading cycle G34 Variable-lead threading G90 torno Simple turning/taper cycle G94 torno Simple facing cycle Fanuc G71.7-G76.7 Modern .7 lathe cycles

See the full list of G and M codes

Frequently Asked Questions (FAQ)

What does G71 mean in a CNC program?

Longitudinal roughing cycle on the lathe. In the catalogue it appears as "Lathe roughing cycle", within the Lathe cycles family.

How is G71 written on each control?

Fanuc: G71 U... R... / G71 P... Q... U... W... F... · Haas: G71 P... Q... D... F... · Siemens: CYCLE95 · Fagor: Ciclos fijos de torneado Fagor. The exact syntax depends on the control version and the machine parameters: always confirm with the manufacturer's manual.

Can you give me an example of G71?

G71 U2 R0.5 — Longitudinal roughing cycle on the lathe.

Which other codes is G71 combined with?

In practice G71 appears alongside these codes: G70, G72, G73. It is worth reading them together, because the state one leaves behind conditions what the next one does.

Which machines use G71?

G71 is used in: Turning, Mill-turn.

What should you watch out for with G71?

High risk: a mistake here can cause a crash, a broken tool or an out-of-tolerance part. Simulate the program and dry-run it before cutting.

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