G-code Basics & Features

G-code is the language used to control CNC machines. This trainer supports several commands and modes:

• G0 / G1: Linear move commands.
  • In Absolute Mode (G90): Coordinates (X, Y) are interpreted as offsets from the grid origin (the center).
  • In Relative Mode (G91): Coordinates are interpreted relative to the current position.
• G2 / G3: Arc move commands.
  • G2: Clockwise arc.
  • G3: Counter-clockwise arc.
  • Parameters:
    • X and Y: Destination coordinates (processed according to the current mode).
    • I and J: Offsets from the start position to the arc’s center (always incremental).
    • Optional feed rate F is parsed but does not affect simulation speed.
• G90: Switch to Absolute Mode (default).
• G91: Switch to Relative Mode.
• You can enter multiple commands by separating them with newlines.

Examples:

• G90 – Set absolute mode.
• G1 X50 Y100 – Move linearly to 50 right and 100 up from origin (absolute mode).
• G91 – Set relative mode.
• G1 X10 Y-20 – Move 10 right and 20 down relative to the current position (relative mode).
• G2 X50 Y0 I0 J-25 – Create a clockwise arc to the specified destination.

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