Difference between drill layer, hole layer, and milling layer in Eagle

Question

What is the difference between the drill layer (44), the hole layer (45), and the milling layer (46) in Eagle PCB?

Bruno Ferreira · Accepted Answer · 2012-07-13 19:01:06Z

24

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.

answered Jul 13 '12 at 18:23

Bruno Ferreira

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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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