Problem with "Restring"

On 11.10.2012 18:53, Graham wrote:

I am using Eagle 6.2.0 Professional, on Windows 7

 

>

I need to change the size of the annular ring (restring)

around two specific pads in a component.  The library for the

part lets me turn off "auto" and choose the size of the

restring for the two pads.  So, I can make the library

footprint for the part look like the part as I want it

on the board.

 

Then Eagle, when placing the part, ignores the library

as built and uses the "global" (or default) percentage restring

in the Design Rules over-riding the desired restring sizes

in the library.

 

I want to use the global settings for the other several thousand pads

and vias in the board. (It is a big board)  I don't want to change

them all to the smaller restring I need in this one place.

 

Searching the email history, I find a long discussion by Richard Hammerl

from November 25, 2008 saying this is not possible in Eagle 4 and 5.

 

Is this possible in Eagle 6.2?

 

--- Graham

 

==

 

>

Graham,

the situation in EAGLE 6 is the same as it was in version 4 or 5.

The pad diameter always obeys at least the minimum value that is

given for the width of the copper ring around the drilling in the

Design Rule's restring settings.

--

Mit freundlichen Gruessen / Best regards

Richard Hammerl

  CadSoft Support -- hotline@cadsoft.de

  FAQ: http://www.cadsoft.de/training/faq/

CadSoft Support wrote on Tue, 16 October 2012 06:40

On 11.10.2012 18:53, Graham wrote:

I am using Eagle 6.2.0 Professional, on Windows 7

 

 

I need to change the size of the annular ring (restring)

around two specific pads in a component.  The library for the

part lets me turn off "auto" and choose the size of the

restring for the two pads.  So, I can make the library

footprint for the part look like the part as I want it

on the board.

 

Then Eagle, when placing the part, ignores the library

as built and uses the "global" (or default) percentage restring

in the Design Rules over-riding the desired restring sizes

in the library.

 

I want to use the global settings for the other several thousand

pads

and vias in the board. (It is a big board)  I don't want to change

them all to the smaller restring I need in this one place.

 

Searching the email history, I find a long discussion by Richard

Hammerl

from November 25, 2008 saying this is not possible in Eagle 4 and

5.

 

Is this possible in Eagle 6.2?

 

--- Graham

 

==

 

 

 

 

Graham,

 

the situation in EAGLE 6 is the same as it was in version 4 or 5.

The pad diameter always obeys at least the minimum value that is

given for the width of the copper ring around the drilling in the

Design Rule's restring settings.

My solution to this is to NEVER use the auto diameter.  The first thing I

do in a new PCB is set the minimum rest-ring to 0 and the max to 9999 (or

some really large number).  By doing that, the DRC will simply use the

diameter given in the library or set explicitly for a given via or pad

object.

To me, it doesn't make much sense to be using the same percentage for

rest-ring on 0.008" drills as for 0.150" drills.  To get a manufacturable

0.008" drill pad the size of the pads for the large holes is huge.  For

mounting holes you might want this, but not always.

So my solution is to NEVER use the auto diameter.  Just be careful.  Any

via that gets through with the diameter set to auto will end up with a

zero-sized rest-ring.  I've been meaning to write a ULP to detect diameter

sizes set to auto, I just haven't got around to that yet.

Cheers,

James.

--

James Morrison  ~~~  Stratford Digital

Specializing in CadSoft EAGLE

• Online Sales to North America

• Electronic Design Services

• EAGLE Enterprise Toolkit

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

James Morrison wrote:

 

My solution to this is to NEVER use the auto diameter.  The first

thing I do in a new PCB is set the minimum rest-ring to 0 and the max

to 9999 (or some really large number).  By doing that, the DRC will

simply use the diameter given in the library or set explicitly for a

given via or pad object.

 

To me, it doesn't make much sense to be using the same percentage for

rest-ring on 0.008" drills as for 0.150" drills.  To get a

manufacturable

0.008" drill pad the size of the pads for the large holes is huge.

For mounting holes you might want this, but not always.

 

So my solution is to NEVER use the auto diameter.  Just be careful.

Any via that gets through with the diameter set to auto will end up

with a zero-sized rest-ring.  I've been meaning to write a ULP to

detect diameter sizes set to auto, I just haven't got around to that

yet.

 

the CadSoft EAGLE community meets.

Hi James

I feel you must do more than what you wrote above. I suspect  you also

change the restring % of drill diameter to 0%?

The library restring size (diameter) only wins out if it is larger than the

DRC calculated size. Leaving the default 25% will still cause issues but

making it small like 0% will ensure the library specified diameter will

always be larger and so will be used.

Warren

--

Viewed / responded via the newsgroup at

news.cadsoft.de

warrenbrayshaw wrote on Wed, 17 October 2012 02:08

James Morrison wrote:

 

My solution to this is to NEVER use the auto diameter.  The first

thing I do in a new PCB is set the minimum rest-ring to 0 and the

max

to 9999 (or some really large number).  By doing that, the DRC

will

simply use the diameter given in the library or set explicitly for

a

given via or pad object.

 

To me, it doesn't make much sense to be using the same percentage

for

rest-ring on 0.008" drills as for 0.150" drills.  To get a

manufacturable

0.008" drill pad the size of the pads for the large holes is huge.

For mounting holes you might want this, but not always.

 

So my solution is to NEVER use the auto diameter.  Just be

careful.

Any via that gets through with the diameter set to auto will end

up

with a zero-sized rest-ring.  I've been meaning to write a ULP to

detect diameter sizes set to auto, I just haven't got around to

that

yet.

 

the CadSoft EAGLE community meets.

 

Hi James

 

I feel you must do more than what you wrote above. I suspect  you also

change the restring % of drill diameter to 0%?

The library restring size (diameter) only wins out if it is larger than

the

DRC calculated size. Leaving the default 25% will still cause issues

but

making it small like 0% will ensure the library specified diameter

will

always be larger and so will be used.

Thanks Warren, you're right.  I do it so often it's hard to remember what I

do each time.  Those settings are rendered in real-time so whatever you set

it to, you will see the results right away in the PCB so you can see the

effects of the settings right away (i.e. not at CAM time).

The other thing I do is set the drill size and diameter via the command

line which is saved because I use projects.  Then I use info to make sure

the diameter is reported correctly for a placed via.  Once that is done

then I have things setup generally for the project defaults.

This also works because I only take parts from my libraries.  If I need a

new part then I create a new part, maybe copying from CadSoft's libraries

to my library, verifying, and then adding to my project.  Lots of the holes

have the diameter set to "auto" which ends up as zero with these settings.

But again, that is shown visually.  You can only change a pad's diameter in

the library so you have to edit that in the library (though there have been

lots of suggestions to be able to edit a footprint instance for a one-time

change).

I also send designs to freedfm.com before I send out to manufacturing that

will find these zero diameters if one sneaks through.  It would be nice to

have a DRC value that checks, and doesn't set, the rest-ring.  This step is

worth the odd sales guy call from Advanced Circuit looking at why the

design was sent through freedfm.com but not sent to AC for manufacturing.

Cheers,

James.

--

James Morrison  ~~~  Stratford Digital

Specializing in CadSoft EAGLE

• Online Sales to North America

• Electronic Design Services

• EAGLE Enterprise Toolkit

--

Web access to CadSoft support forums at www.eaglecentral.ca.  Where the CadSoft EAGLE community meets.

Thanks to all who replied.

I now know how to "trick" Eagle into doing what I want.

Thanks,

--- Graham

==

On 10/17/2012 10:26 AM, James Morrison wrote:

warrenbrayshaw wrote on Wed, 17 October 2012 02:08

>> James Morrison wrote:

>>>

>>> My solution to this is to NEVER use the auto diameter.  The first

>>> thing I do in a new PCB is set the minimum rest-ring to 0 and the

>>> max

>>> to 9999 (or some really large number).  By doing that, the DRC

>>> will

>>> simply use the diameter given in the library or set explicitly for

>>> a

>>> given via or pad object.

>>>

>>> To me, it doesn't make much sense to be using the same percentage

>>> for

>>> rest-ring on 0.008" drills as for 0.150" drills.  To get a

>>> manufacturable

>>> 0.008" drill pad the size of the pads for the large holes is huge.

>>> For mounting holes you might want this, but not always.

>>>

>>> So my solution is to NEVER use the auto diameter.  Just be

>>> careful.

>>> Any via that gets through with the diameter set to auto will end

>>> up

>>> with a zero-sized rest-ring.  I've been meaning to write a ULP to

>>> detect diameter sizes set to auto, I just haven't got around to

>>> that

>>> yet.

>>>

>>> the CadSoft EAGLE community meets.

>>

>>

>> Hi James

>>

>> I feel you must do more than what you wrote above. I suspect  you also

>> change the restring % of drill diameter to 0%?

>> The library restring size (diameter) only wins out if it is larger than

>> the

>> DRC calculated size. Leaving the default 25% will still cause issues

>> but

>> making it small like 0% will ensure the library specified diameter

>> will

>> always be larger and so will be used.

>

Thanks Warren, you're right.  I do it so often it's hard to remember what I

do each time.  Those settings are rendered in real-time so whatever you set

it to, you will see the results right away in the PCB so you can see the

effects of the settings right away (i.e. not at CAM time).

 

The other thing I do is set the drill size and diameter via the command

line which is saved because I use projects.  Then I use info to make sure

the diameter is reported correctly for a placed via.  Once that is done

then I have things setup generally for the project defaults.

 

This also works because I only take parts from my libraries.  If I need a

new part then I create a new part, maybe copying from CadSoft's libraries

to my library, verifying, and then adding to my project.  Lots of the holes

have the diameter set to "auto" which ends up as zero with these settings.

But again, that is shown visually.  You can only change a pad's diameter in

the library so you have to edit that in the library (though there have been

lots of suggestions to be able to edit a footprint instance for a one-time

change).

 

I also send designs to freedfm.com before I send out to manufacturing that

will find these zero diameters if one sneaks through.  It would be nice to

have a DRC value that checks, and doesn't set, the rest-ring.  This step is

worth the odd sales guy call from Advanced Circuit looking at why the

design was sent through freedfm.com but not sent to AC for manufacturing.

 

Cheers,

 

James.