G74/G75: Deep drilling and grooving on the lathe

Cycles used for deep front drilling, grooving or pecking parting according to control.

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: G74 R... / G75 X... Z... P... Q... F...

G74/G75

Lathe cycles

Deep drilling and grooving on the lathe

E.g.:

G74 R... / G75 X... Z... P... Q... F...

Parameters

R (1er bloque): Retroceso entre picados. · mm
X(U) Z(W): Punto final del ranurado/taladrado: X en G75 (ranura radial), Z en G74 (taladrado o ranura frontal). · mm
P: Paso entre ranuras en X (G75) o desplazamiento en X entre picados (G74). · µm sin punto decimal en Fanuc (P2000 = 2 mm)
Q: Profundidad de cada picado en Z (G74) o en X (G75). · µm sin punto decimal en Fanuc (Q3000 = 3 mm)
R (2º bloque): Retroceso al fondo de la ranura antes de volver (evita marcar). · mm
F: Avance de corte. · mm/min con G94, mm/vuelta con G95 (en torno suele ser el modo por defecto)

Machine: Turning, Mill-turnRisk: High

Fanuc · Haas

G74 / G75

Fanuc: The exact meaning and the P/Q/R letters change between controls.
Fanuc: Confirms whether P/Q are in microns, thousandths, or programmed units.
Haas: Useful for grooving/pecking parting, but sensitive to formatting and retractions.

Siemens · Fagor

Siemens: Find equivalent Siemens lathe grooving/drilling cycle.
Fagor: Search for Fagor grooving/parting cycle by model.

Other codes in Lathe cycles

G71 Lathe roughing cycle G76 Lathe threading cycle 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 G74/G75 mean in a CNC program?

Cycles used for deep front drilling, grooving or pecking parting according to control. In the catalogue it appears as "Deep drilling and grooving on the lathe", within the Lathe cycles family.

How is G74/G75 written on each control?

Fanuc: G74 / G75 · Haas: G74 / G75. 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 G74/G75?

G74 R... / G75 X... Z... P... Q... F... — Cycles used for deep front drilling, grooving or pecking parting according to control.

Which other codes is G74/G75 combined with?

In practice G74/G75 appears alongside these codes: G71, G76, Fagor torneado. It is worth reading them together, because the state one leaves behind conditions what the next one does.

Which machines use G74/G75?

G74/G75 is used in: Turning, Mill-turn.

What should you watch out for with G74/G75?

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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