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Real-Time 3D Graphics Simulation for Computer Numerical Control
| G21 METRIC OR SI UNITS | |
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N_ G21 |
| The G21 command defaults the system to metric units. When a program is being run and the G21 command is encountered, all coordinates are stated as millimeter units. This command is usually found at the beginning of a program. However, it can be used to switch between metric and inch units in the middle of a program. | |
| Example G21 | |
| % | (PROGRAM START FLAG) |
| :1021 | |
| N5 G90 G21 G40 | |
| N15 T0303 | |
| N17 M03 | |
| N20 G00 Z2 M08 | |
| N25 X45 | |
| N30 G01 Z-50 F1 | |
| N35 X40 | |
| N40 Z2 | |
| N45 X35 | |
| N50 Z-25 | |
| N55 X30 | |
| N60 Z-10 | |
| N65 G00 X100 M09 | |
| N70 Z100 | |
| N75 T0300 M05 | |
| N80 M02 |