Editing eagle library

Hi Jim,

Did you follow the "Editing and Updating Components" section in the EAGLE user manual?

Did you click on Update as described there, after editing and saving the library?

Without seeing a list of the steps you took, it is only possible to vaguely guess what you may or may not

have missed.

With little information, the answers can only have a simple response that may not apply to your specific scenario.

I have:

placed the pads

realigned the pads

resized the pads

saved the library

updated the library

deleted the pads

replaced the pads

resized the pads

saved the library

updated the library

repeated these steps over 10 times for each library to the point that I no longer have any clue as to what I have done, or what doesn't work, or what is causing the problem. I have read almost every tutorial, and link I can find to fix this. I can't that's why I am asking.

Does the DRC file alter the library? I thought that this was a filter to find problems, not something that would adjust a library. Am I wrong?

Jim McAuley wrote:

 

 

Does the DRC file alter the library? I thought that this was a filter to find problems, not something that would adjust a library. Am I wrong?

The DRC setting can cause a difference between the library and the board. It's an annoying "feature". For example the restring setting can cause a through hole pad to appear larger in the board than in the library.

Best Regards,

Rachael

Am 01.09.2016 um 21:27 schrieb Jim McAuley:

I'm having problems with an eagle library I have created. Every time I edit the library to correct the problem nothing seems to change. I have tried everything I can think of and in every combination. I have check all the tutorials they don't cover the problems that I have. Can anybody help!

 

I have posted the files at the following site:

http://sabercathost.com/13Q8/1.2V_PSU_NQR010A0X.pdf (https://www.element14.com/community/external-link.jspa?url=http%3A%2F%2Fsabercathost.com%2F13Q8%2F1.2V_PSU_NQR010A0X.pdf)

http://sabercathost.com/13Q9/lineage-power.lbr (https://www.element14.com/community/external-link.jspa?url=http%3A%2F%2Fsabercathost.com%2F13Q9%2Flineage-power.lbr)

http://sabercathost.com/2jSS/power-module-1.2v.lbr (https://www.element14.com/community/external-link.jspa?url=http%3A%2F%2Fsabercathost.com%2F2jSS%2Fpower-module-1.2v.lbr)

 

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All these lists are for the birds.

Place your library here so users can analyse it and describe what is

wrong with it

or what you wish to change.

--

Mit freundlichen Grüßen / With best regards

Joern Paschedag

Does the DRC file alter the library? I thought that this was a filter to find problems, not something that would adjust a library. Am I wrong?

 

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Hi Jim,

I hope you're doing well. You didn't give an exact description of what

you were seeing by judging by your question I think Rachael nailed it on

the head.

First some explanations are in order:

The Restring tab of the DRC is likely what is causing your through hole

pads to be larger on the board than what you specified in the library.

The intent of this feature is noble, however since it's behavior is not

expected it tends to create confusion. The goal of the restring function

is to make sure that the annular rings on through holes pads and vias is

thick enough for the pad to survive an off-center drilling by the

manufacturer. Everything in the real world has a tolerance, and with

some manufacturer's the tolerances on drill locations are actually very

wide. If a drill is so off that it passes the outside diameter of the

pad, the pad will break and will no longer be reliable.

Because this can be such a critical manufacturing issue, the DRC

Restring is always in play. EAGLE will compare the pad diameter

calculated by the DRC to whatever you specified in the library. The

LARGER of the two wins. In your case the the diameter you specified in

the library for the diameter of the pads is too small and the DRC bumps

it up to conform to the default design rules.

So what's the solution?

The best thing to do here is to adjust the restring settings to match

whatever your board manufacturer requires. If you do that then assuming

your board house can make the thinner annular rings you want the pads

will not be changed. If the board house can't handle it then you'll see

the annular rings swell again and you'll have to talk to your manufacturer.

Please let me know if there's anything else I can do for you.

Best Regards,

Jorge Garcia