G74 fresado: Reverse tapping / special milling cycle

On the mill it usually means reverse tapping or a left-hand tapping cycle depending on the 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: Cycles
Machine: Milling, Mill-turn
Risk: High
Example: G74 X10 Y10 Z-15 R2 F1.25

G74 fresado

Cycles

Reverse tapping / special milling cycle

E.g.:

G74 X10 Y10 Z-15 R2 F1.25

Parameters

X Y: Posición del agujero. Cada bloque con X/Y nuevos repite el ciclo en esa posición. · mm
Z: Fondo de la rosca (rosca a izquierdas: el husillo gira en M04). · mm
R: Plano de referencia: cota Z a la que la herramienta pasa de rápido a avance y a la que vuelve entre agujeros con G99. · mm
F: Avance = paso × rpm en G94; en G95, F = paso. · mm/min o mm/vuelta
S: Revoluciones del husillo. · rpm

Machine: Milling, Mill-turnRisk: High

Fanuc · Haas

G74 ...

Fanuc: Don't confuse it with lathe G74; check spindle direction and feed.
Haas: Used for left-hand tapping on many Haas controls.

Other codes in Cycles

G80 Cancel fixed cycle G98/G99 Return plane in canned cycles G81/G82/G83 Drilling canned cycles G84 Rigid threading on a milling machine G85-G89 Boring, reaming and hole cycles G73 Fast pecking drilling G86/G87/G88 Special boring cycles

See the full list of G and M codes

Frequently Asked Questions (FAQ)

What does G74 fresado mean in a CNC program?

On the mill it usually means reverse tapping or a left-hand tapping cycle depending on the control. In the catalogue it appears as "Reverse tapping / special milling cycle", within the Cycles family.

How is G74 fresado written on each control?

Fanuc: G74 ... · Haas: G74 .... 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 fresado?

G74 X10 Y10 Z-15 R2 F1.25 — On the mill it usually means reverse tapping or a left-hand tapping cycle depending on the control.

Which machines use G74 fresado?

G74 fresado is used in: Milling, Mill-turn.

What should you watch out for with G74 fresado?

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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