G73: Fast pecking drilling

Drilling cycle with small setbacks to break chips without completely removing the drill bit.

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: Medium
Example: G73 X10 Y10 Z-20 R2 Q1 F120

G73

Cycles

Fast pecking drilling

E.g.:

G73 X10 Y10 Z-20 R2 Q1 F120

Parameters

X Y: Posición del agujero. Cada bloque con X/Y nuevos repite el ciclo en esa posición. · mm
Z: Fondo del agujero (cota absoluta con G90; incremental desde R con G91). · 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
Q: Profundidad de cada picado; el retroceso es corto (rompe viruta, no sale del agujero). · mm, positivo
F: Avance de corte. · mm/min con G94, mm/vuelta con G95 (en torno suele ser el modo por defecto)
K / L: Repeticiones del ciclo en modo incremental (patrones de agujeros equidistantes).K en Fanuc, L en Haas. K0/L0 = solo memoriza el ciclo sin ejecutarlo.

Machine: Milling, Mill-turnRisk: Medium

Fanuc

G73 X... Y... Z... R... Q... F...

Q defines the peck; it doesn't replace G83 on deep holes.

Haas

G73 ... Q...

Check the units of Q and the return plane with G98/G99.

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 G74 fresado Reverse tapping / special milling cycle G86/G87/G88 Special boring cycles

See the full list of G and M codes

Frequently Asked Questions (FAQ)

What does G73 mean in a CNC program?

Drilling cycle with small setbacks to break chips without completely removing the drill bit. In the catalogue it appears as "Fast pecking drilling", within the Cycles family.

How is G73 written on each control?

Fanuc: G73 X... Y... Z... R... Q... F... · Haas: G73 ... Q.... 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 G73?

G73 X10 Y10 Z-20 R2 Q1 F120 — Drilling cycle with small setbacks to break chips without completely removing the drill bit.

Which machines use G73?

G73 is used in: Milling, Mill-turn.

What should you watch out for with G73?

Medium risk: it rarely breaks anything on its own, but a wrong value shows up on the part. Check the block before running the batch.

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