9.4, different pad sizes in library (footprint) and pcb

[notameadow]

Hey,

I’m creating a custom part with custom pads, the size is 68/76 long (I know, it’s tight with 100mil spacing, that’s another matter).

But, in the footprint editor it looks like this:

Which is still within manufacturing tolerance for me, but the layout editor shows:

I have saved it, I have updated all, I also added a new part again from the library to be sure it's not some refresh issue.

What did I do wrong?

Thanks.

[rachaelATWH4 · Accepted solution]

Hi,

This is a very common question and is due to the annular ring setting in the DRC. The pads of the footprint are defined in the library with the "auto" setting for the diameter parameter so EAGLE calculated the diameter based on the hole size and the DRC settings. You will need to adjust the setting to get the pads to look correct but beware this setting applies board wide so will likely to affect something else too.

Best Regards,

Rachael

[notameadow]

Thanks but I’m not sure that’s the case here - I don’t have diameter set to
auto (for the pads), it’s set to 76 with 68 hole.

Is there another auto in DRC that overrides this?

[one-of-the-robs · Accepted solution]

Nonetheless, @rachaelATWH4  is right that it's the DRC rule. The DRC imposes a MINIMUM for manufacturability, and if your library specifies a pad size that would break that then the pads still get enlarged, even if they're not "auto". They just don't get shrunk if the annular ring setting is very small.

[notameadow]

Thank was indeed the case, thanks!