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EAGLE User Chat (English) restring questions
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Related

restring questions

autodeskguest
autodeskguest over 10 years ago

Good afternoon, everyone,

 

I'm working with a library part (a dual DB15 connector) and I'm trying

to understand how the DRC restring (isn't the English term for this

"annulus"?) parameters work.

 

I'm referencing

http://www.element14.com/community/community/experts/blog/2012/03/02/eagle--what-are-the-restring-settings-in-the-design-rules-for

but Eagle 6.6.0 doesn't appear to be using the parameters in the way

that that article suggests.

 

My DRC restring settings are as follows:

 

Pads (Diameter is checked):

Top: Min 0mil, 25%, Max 20mil

Inner: Min 0mil, 25%, Max 10mil

Bottom: Min 0mil, 25%, Max 20mil

 

The text in the DRC window box says "Restrings for pads and vias are

defined in percent of the drill diameter (limited by Min and Max). If

the diameter of an actual pad or via would result in a larger restring,

that value will be used in the outer layers.  If the Diameter option is

checked the actual pad or via diameter will be taken into account in

the inner layers, too."

 

My library component has mounting pads that have both a defined drill

(118mil) and diameter (137mil). To re-iterate: my pad diameter is not

set to "auto".

 

According to the link at the start of my posting, I should take the

drill diameter (118mil), multiply by the %age (25%) to find out what

the "auto" diameter would be. 25% of 118 is 29.5mil. This is larger

than the maximum specifed for the top and bottom restring parameters.

 

If the diameter were set to "auto" then I expect that Eagle would

automatically reduce up the pad restring/annulus to be 20mil, but since

my pad diameter is explicitly set in the library footprint, Eagle

should be leaving it alone, shouldn't it?

 

What I am seeing is that Eagle is making the ring around the drill

bigger than the one specified in the library part.  I have specified

137mil, for a ring width of (137 - 118)/2 or 9.5mil.

 

The only way I can get Eagle to stop making the diameter bigger is by

reducing the maximum, which seems odd because it's the minimum that

should be defining the smallest pad ring size, not the maximum. My

minimum is already 0, so why is Eagle messing with my rings?

 

Clearly I'm misunderstanding something. Any help in understanding this

would be greatly appreciated.

 

 

 

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