Usage
The Excellon format is used to exchange drill and rout data between CAD/CAM systems as well as to drive CNC machines. The Excellon format was designed for and is suitable for driving an NC drilling machine, though there are some issues related to coordinate format specification. It is not ideal for exchanging data between CAD/CAM systems: essential information such as plating and drill span is missing.
For data exchange between CAD/CAM systems it is more practical to describe the drill data in Gerber RS-274X format. This is also a simple format, and quality of the RS-274X software is usually better than that of the Excellon output processors.
Read more about this topic: Excellon Format
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