G21 Metric input confirmation

Okuma OSP G-code · Mill

Okuma lists G21 as metric input confirmation. It tells the control the program is in millimeters.

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

Format

G21

How it works

Modal, unit group. Optional feature.

Example program

O1000 (OKUMA MILL SAMPLE)
N1 G21 (METRIC PROGRAM)
N2 G15 H1 (WORK COORDINATE SYSTEM 1)
N3 G00 G90 X25. Y25. (POSITION IN MM)

Example is in inch. Check offsets and clearances first.

Watch out for

Do not mix G20 and G21 in one program.
Check the unit parameter before running a program from another shop.

Related codes

G20

G21 on other controls

The same number can mean something different on another control.

Control	Meaning
Fanuc	Metric input
Haas NGC	Metric programming check
Mazak (EIA)	Metric input
Mitsubishi M70 M80	Metric input
Brother Speedio	Metric input
LinuxCNC Tormach	Millimeter units
Mach3 Mach4	Metric units
Centroid CNC12 Acorn	Metric units
Hurco WinMax (NC)	Metric input (ISNC)
Fadal	Check for metric setting
Swiss (Citizen Star)	Metric input

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Open G21 in the app All Okuma OSP G-codes

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