Home › G-codes › Fanuc › G12.1

G12.1 Polar coordinate interpolation on

Fanuc G-code · Mill, Lathe

On mills: Polar coordinate interpolation on

Turns a linear axis and a rotary axis into a flat X and C plane so you can program flats or slots on the face of a part in Cartesian moves. Mostly used on lathes with live tooling, rare on mills.

Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.

Format

How it works

Modal, group 21. Cancel with G13.1.

Example program

The full 5-line example is in the app. Example is in inch. Check offsets and clearances first.

Watch out for

• This is an option. The linear and rotary axis pair is set by parameters.
• Start and cancel cutter compensation inside the mode, not across G12.1 or G13.1.
• On many mills you will never see it. Use it only if the builder set it up.

On lathes: Polar coordinate interpolation on

Turns a live tool, X and the C axis into a flat XY style plane on the face of the part. Use it to mill flats, hex and slots on the face with X and C moves.

Verify on your machine. This entry could not be fully checked against the maker manual. Check your machine manual before you run it.

Format

Addresses

How it works

Modal until G13.1.

Example program

The full 9-line example is in the app. Example is in inch. Check offsets and clearances first.

Watch out for

• Many machines need G17 before G12.1. Follow the builder example.
• C is a linear distance inside the mode, not degrees.
• Feed slows near the center. Keep the tool path away from X0 when you can.

Related codes

G13.1 · G07.1 · G17 · G18 · G98

G12.1 on other controls

The same number can mean something different on another control.