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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.
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  • \$\begingroup\$ why is drill used for pads? Does that mean a pad with a hole in it? \$\endgroup\$ – Alexis K Jul 13 '12 at 18:59
  • \$\begingroup\$ @AlexisK Yes, when I mean pads I'm referring to through hole components. \$\endgroup\$ – Bruno Ferreira Jul 13 '12 at 19:02
  • \$\begingroup\$ Thanks for answer! I tested with layer 20 (dimensions) and everything is ok. \$\endgroup\$ – user71369 Apr 2 '15 at 18:54
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    \$\begingroup\$ The 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. \$\endgroup\$ – Max Kielland Oct 4 '17 at 20:22

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