What is the difference between the drill layer (44), the hole layer (45), and the milling layer (46) in Eagle PCB?
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- Drill layer (44) is used for pads (of through hole components) and vias.
- Hole layer (45) is used for mounting holes.
- Milling layer (46) is used for cutouts on the board, usually you can use the dimension layer (20) for that too.
Bruno Ferreira
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why is drill used for pads? Does that mean a pad with a hole in it? – Alexis K Jul 13 '12 at 18:59
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@AlexisK Yes, when I mean pads I'm referring to through hole components. – Bruno Ferreira Jul 13 '12 at 19:02
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Thanks for answer! I tested with layer 20 (dimensions) and everything is ok. – Apr 02 '15 at 18:54
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1The reason for dividing these holes and dimensions on several layers are because a lot of the default scripts and ULP expect certain things to be on a specific layer. – Max Kielland Oct 04 '17 at 20:22