What does n mean in G-code?

In G-code, the letter "n" represents the block number. Each line of G-code is a block, and the "n" value helps identify and sequence these blocks during program execution.

Here's how it works:

• Block Numbering: The "n" value is assigned to each line of G-code, starting from 1. For example, "N10" would be the 10th line in the program.
• Program Execution: The CNC machine reads and executes the G-code blocks sequentially, following the assigned "n" values.
• Program Editing: The "n" value allows for easy editing and modification of the program, as you can easily identify and change specific blocks.

Example:

N10 G01 X10 Y10 F1000   ; Move to X10 Y10 at a feed rate of 1000 mm/min
N20 G00 Z5              ; Rapid traverse to Z5
N30 M30                 ; Program end

In this example, "N10", "N20", and "N30" represent the block numbers for each line of G-code.

Practical Insights:

• Program Organization: Block numbering helps keep your G-code program organized and readable.
• Debugging: It simplifies debugging by allowing you to easily identify and troubleshoot specific blocks of code.
• Program Flow: The "n" value clearly defines the execution order of the program's instructions.

Solutions:

• Missing Block Numbers: If you need to insert a new block, you can assign it a unique "n" value, ensuring a proper program flow.
• Re-numbering: If you need to re-order blocks, you can re-assign their "n" values accordingly.