G68/G69: Coordinate rotation

Rotate the coordinate system to machine repeated or inclined geometries.

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: Coordinate equivalences
Machine: Milling, Mill-turn
Risk: High
Example: G68 X0 Y0 R45 / G69

G68/G69

Coordinate equivalences

Coordinate rotation

E.g.:

G68 X0 Y0 R45 / G69

Parameters

X Y: Centro de rotación (en el plano activo). · mm
R: Ángulo de giro; positivo antihorario. · gradosG69 cancela. En Haas la rotación puede requerir el parámetro/opción de rotación y escala.

Machine: Milling, Mill-turnRisk: High

Fanuc

G68 X... Y... R... / G69

May require active option in the control. Always cancel with G69.

Haas

G68 / G69

Confirm rotation option and center of rotation.

Siemens · Heidenhain · Fagor

Siemens: Siemens equivalence: ROT / AROT.
Heidenhain: Conceptual equivalence: PLANE/ROT or plane/datum rotations according to TNC.
Fagor: Fagor equivalence depends on available transformation functions.

Other codes in Coordinate equivalences

G51/G50 Scale/scale cancellation

See the full list of G and M codes

Frequently Asked Questions (FAQ)

What does G68/G69 mean in a CNC program?

Rotate the coordinate system to machine repeated or inclined geometries. In the catalogue it appears as "Coordinate rotation", within the Coordinate equivalences family.

How is G68/G69 written on each control?

Fanuc: G68 X... Y... R... / G69 · Haas: G68 / G69. 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 G68/G69?

G68 X0 Y0 R45 / G69 — Rotate the coordinate system to machine repeated or inclined geometries.

Which other codes is G68/G69 combined with?

In practice G68/G69 appears alongside these codes: TRANS/ROT/SCALE/MIRROR, G52/G92, G54-G59. It is worth reading them together, because the state one leaves behind conditions what the next one does.

Which machines use G68/G69?

G68/G69 is used in: Milling, Mill-turn.

What should you watch out for with G68/G69?

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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