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EAGLE Gerber Tutorial
Preparing the Manufactoring Data
Note: Octagon apertures in Gerber RS-274X format
The various Gerber viewers on the market have different ideas about how to display octagon apertures in RS-274X format. There all all kinds of interpretations of the diameter and rotation.
When generating octagon apertures in RS-274X format, EAGLE assumes that the viewer will interpret the diameter as the distance between two opposite corners, and that it has to be rotated by 22.5 degrees to achieve the proper alignment. In case your specific viewer interprets these data differently you can adjust this to your viewer's special needs in the file 'eagle.def'.
IMPORTANT: Before sending data in RS-274X format to your board house you should make sure you ask them how *their* software will interpret octagon data.
Gerber
