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Place from Library [message #166056] Wed, 15 June 2016 21:50 Go to next message
Messages: 20
Registered: January 2016
Junior Member
Any thoughts on being able to place devices to an open drawing from within
an open library?
I often make a library that is local to the project in order to not mess up
global footprints. Workaround for now is to add the location of the project
library to the library path specified in Options.
(version 7.6)

Thanks - Oppie
Re: Place from Library [message #166097 is a reply to message #166056] Sat, 25 June 2016 23:53 Go to previous message
Messages: 186
Registered: September 2011
Location: Cincinnati
Senior Member
[i]I often make a library that is local to the project in order to not mess up
global footprints[/i2
That's how Eagle's lib system is almost a completely mess. I look all around & see 350 different parts with a "TO220" geometry. Are all of these "TO220" geometries exactly the same? How can you tell? Are 29 of them style "A" , 200 of them style "B" & 121 of them style "C"...you can't tell since they are all called "TO220" & replicated all over different locations like ants.

When designing a new part, who can tell how many different geometries are available in the system? How many different TO-92's are there? Or maybe they are all the same... or all different? Can't tell.

Eagle should prevent any part or geometry from having a duplicate name anywhere in the system. Each geometry should be usable without repeating it all over the place. So if you define a TO-3456, it is located in one place and can be used for as many different parts as you like. It is impossible by program enforcement to have a different TO-3456 anywhere else. So then there is no possible mistake as to what a TO-3456 really is. Say a different one IS needed for some reason, then it will have a different name, say, TO-3456-(A1) (or some field that indicates variations). Again that new variation can be used anywhere & can only be that exact style.
Then all usable currently defined TO-3456 styles can be easily examined in one place for use in creating new parts.

If desired, a part could be embedded into the particular design file, though not required. Regardless, it must match the definition. Should a part needs to differ in any respect, it requires a new number or variation. Then it will be easy to see what TO-220 styles are available for new design (in this example styles A, B, C exist)...rather than wondering if there are 3 styles or 250 styles. Cadsoft can maintain a master list of styles, so as others create any variations, they can simply be added to the types available.
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