Excellon drill format

File Format
Name	Excellon drill format
Ontology	Electronic File Formats 3D and CAD/CAM Models Excellon drill format
Extension(s)	.emb
Wikidata ID	Q5419446
Released	1985

Excellon drill format is a file format used by drilling and routing machines from Excellon. It is a subset of RS274D, and is considered an industry standard. The Gerber format has similar uses, and there are utilities to convert between the formats.

Excellon drill format consists of a series of commands in a text file, one per line, with a header (starting with command M48 and ending with command M95; the header is optional) and a body.

There are two different formats (FMAT 1 and FMAT 2) which have different commands in the body section.

Specifications

• Excellon format spec (archived)

Links

• A description of the format
• Excellon file format options (DesignSpark)
• [[Wikipedia:PCB NC formats|Wikipedia article on PCB NC formats]