Hi All, Finding understandable specifications of drill files in "Excellon" format, also called NC drill files is not an easy task. Currently there is no freely available document.
A document about specifications for ECAD tools like Kicad is now available here: https://www.ucamco.com/files/downloads/file/300/the_xnc_file_format_specification_draft.pdf?5ebe1b6e677f8b221066e44ee1bfa839 It was written from the experience of a few organizations that wrote software (CAD and CAM) to work on these drill files. Because Kicad is one of organizations that worked on this document, it can be published on the Kicad site. For those who do not know the NC drill files specifs, this is a short an easy to read document. This is especially interesting because oblong holes were never really clearly defined. They are now defined in this document. (Users who have designed boards using oblong holes know what kind of issues these holes create) Notes: 1- Pcbnew can create drill files in NC format and Gerber format. 2- Ucamco is the owner of the Gerber format. It is not the owner of NC format, only the owner of this document. The document was written to help guys who use NC drill files (guys who write software to create and read these files, and of course other users) -- Jean-Pierre CHARRAS _______________________________________________ Mailing list: https://launchpad.net/~kicad-developers Post to : kicad-developers@lists.launchpad.net Unsubscribe : https://launchpad.net/~kicad-developers More help : https://help.launchpad.net/ListHelp