Last Edit: Saturday, 26 March 2022

The Excellon format is widely used to drive CNC drilling and routing machines in printed circuit board (PCB) manufacturing. It is a variant of the EIA RS-274-C (G-code) standard.

 

The name Excellon format is derived from the Excellon Automation Company, which was the market leader in PCB drilling and routing machines during the 1980s, and whose proprietary format became widely used.

 

The IPC organization defined the IPC-NC-349 format as standard NC format. It is similar to the Excellon format.