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The Excellon format 〔http://www.excellon.com/manuals/program.htm original〕 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 standard. Below is a sample file: M48 METRIC,TZ FMAT,2 ICI,OFF T02C0.8000 T01C0.9000 T03C1.9500 T04C3.2000 % M71 G90 G93X0Y0 T02 X125730Y16193 Y16828 Y17463 ... M30 The name Excellon format is derived from the Excellon Automation Company, which was 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〔IPC-NC-349 Computer Numerical Control Formatting for Drillers and Routers, published in 1985〕 as standard NC format. It is similar to the Excellon format. == Usage == The Excellon format was designed for and is primarily used to drive NC drill and route machines. It is suitable for that task as it can specify machine specific information such drill feed and speed. The Excellon format is also used to transfer design information from CAD to CAM. It is ''not'' adequate for that task: essential information such as plating and drill span is missing. Furthermore, the Excellon output in CAD systems is often poorly implemented, resulting in poor registration between drill holes and copper layers and other problems. For data exchange between CAD/CAM systems it is more practical to describe the drill data in Gerber format as the quality of the Gerber file output software is usually better and Gerber supports attributes to transfer meta-information such as which are the via holes.〔The RS-274X Format, published by Ucamco in December 2010, downloadable at http://www.ucamco.com〕〔(【引用サイトリンク】 PCB Layout Data )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Excellon format」の詳細全文を読む スポンサード リンク
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