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Consistency errors

maciv4

Well, its happened again. I have consistency errors. How do I resolve them. I have tried to delete the offending part from the schematic, both with the board open and closed. I have tried replacing the offending part with a new part from a brand new library. I have tried to delete the part from the schematic, close the schematic reopen the schematic and the board. I have airwires on the board but can't place or select the part. What do I try next?

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  • Thanks for the offer, but the board has long been deleted and a new board is under construction. I did manage to clear the errors I was having but in doing so I came up with 2 questions.

    Question 1:

    My DRC rules state that the pad diameter must be a min of 8mil.

    My part recomendation is a pad diameter of 8mil.

    I have built the part according to the manufacturers recomendation.

    Yet if you look at the part and the library side by side the rings of the part on the board are larger than the rings of the part in the library.

    Which one will be used in the gerber file, the library or the board representation?

     

    Question 2:

    My problem has been with Clearence errors between pins of the same part.

    The clearence of the pins according to the library is about 9mil, a fact that was confirmed by another member of this site.

    The clearence distance listed in the DRC file is 8mil.

    If I set this distance to 4mil, the errors go away. Isn't the distance from one point to another the same as the distance from another to the one?

    Why does eagle count both as different distances?

  • in reply to maciv4

    Jim McAuley wrote:

     

    Thanks for the offer, but the board has long been deleted and a new board is under construction. I did manage to clear the errors I was having but in doing so I came up with 2 questions.

    Question 1:

    My DRC rules state that the pad diameter must be a min of 8mil.

    My part recomendation is a pad diameter of 8mil.

    I have built the part according to the manufacturers recomendation.

    Yet if you look at the part and the library side by side the rings of the part on the board are larger than the rings of the part in the library.

    Which one will be used in the gerber file, the library or the board representation?

     

    Question 2:

    My problem has been with Clearence errors between pins of the same part.

    The clearence of the pins according to the library is about 9mil, a fact that was confirmed by another member of this site.

    The clearence distance listed in the DRC file is 8mil.

    If I set this distance to 4mil, the errors go away. Isn't the distance from one point to another the same as the distance from another to the one?

    Why does eagle count both as different distances?

    As has been stated by myself and confirmed by Jorge several times now, look at the Restring setting in the DRC. Jorge gave you a long and detailed explanation of this earlier this afternoon and it explains exactly what you are seeing with the change in pad size between the library and board. This change in pad size is why setting the DRC clearance rules to 4mil fixes the issue. Don't do that, change the resting setting as we've told you many times.

     

    Best Regards,

     

    Rachael

  • in reply to rachaelp

    Pardon me for butting in...

     

    It appears to me that Jim is saying he's set the DRC rules right but

    Rachael (and others) are sure he hasn't. The evidence does seem to

    support this, so I wonder... has Jim misinterpreted something? Perhaps

    something as simple as entering the required diameter where a radius is

    needed? Would it be beneficial for him to post his DRC file for review?

     

     

    On 02/09/16 19:01, rachaelp wrote:

    Jim McAuley wrote:

     

    Thanks for the offer, but the board has long been deleted and a new board is under construction. I did manage to clear the errors I was having but in doing so I came up with 2 questions.

    Question 1:

    My DRC rules state that the pad diameter must be a min of 8mil.

    My part recomendation is a pad diameter of 8mil.

    I have built the part according to the manufacturers recomendation.

    Yet if you look at the part and the library side by side the rings of the part on the board are larger than the rings of the part in the library.

    Which one will be used in the gerber file, the library or the board representation?

     

    Question 2:

    My problem has been with Clearence errors between pins of the same part.

    The clearence of the pins according to the library is about 9mil, a fact that was confirmed by another member of this site.

    The clearence distance listed in the DRC file is 8mil.

    If I set this distance to 4mil, the errors go away. Isn't the distance from one point to another the same as the distance from another to the one?

    Why does eagle count both as different distances?

    As has been stated by myself and confirmed by Jorge several times now, look at the Restring detting in the DRC. Jorge gave you a long and detailed explanation of this earlier this afternoon and it explains exactly what you are seeing with the change in pad size between the library and board. This change in pad size is why setting the DRC clearance rules to 4mil fixes the issue. Don't do that, change the resting setting as we've told you many times.

     

    Best Regards,

     

    Rachael

     

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    To view any images and attachments in this post, visit:

    https://www.element14.com/community/message/205036

     

     

     

  • in reply to autodeskguest

    The DRC file is from Sunstone Circuits and is available to anyone who would like to download it.

  • in reply to maciv4

    Jim McAuley wrote on Fri, 02 September 2016 22:01

    The DRC file is from Sunstone Circuits and is available to anyone who

    would like to download it.

     

    --

    To view any images and attachments in this post, visit:

    https://www.element14.com/community/message/205040

     

     

    So you still haven't changed your restring setting then?

    --

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

     

  • in reply to rachaelp

    None of the settings on the restring tab are causing a problem. I will finish building the board until I get 16 clearence errors. Then change the clearence value to 4mil. Since there are 5 pads 9mil apart on both sides of he board, this will mean that all of the errors are due to Eagle wanting 16mil separation between the pads for 8mil of clearence, the board will pass with no errors and I will generate my gerbers error free.

  • in reply to maciv4

    Jim McAuley wrote:

     

    None of the settings on the restring tab are causing a problem. I will finish building the board until I get 16 clearence errors. Then change the clearence value to 4mil. Since there are 5 pads 9mil apart on both sides of he board, this will mean that all of the errors are due to Eagle wanting 16mil separation between the pads for 8mil of clearence, the board will pass with no errors and I will generate my gerbers error free.

    There should be 9mil of clearance between the pads IF you have created the part exactly per the datasheet and the pads are the same when viewed in the board as in the library. You said that they were not the same in the board and if this is the case then this will be caused by restring. I don't think there is any other reason for the pads physically being different between the board and the library unless the part in the board is not actually the same part as in the library and is maybe referencing another copy of the library part elsewhere.

     

    EAGLE doesn't need 16mil of separation for 8mil of clearance so although dropping the DRC to 4mil will clear your errors I think your reasoning for why it's working is not correct. If you are happy clearing the errors this way rather than a) fixing the real issue or b) just approving the DRC errors then thats fine, go ahead and generate your gerbers and move on as you've spent far too long on this.

Reply
  • in reply to maciv4

    Jim McAuley wrote:

     

    None of the settings on the restring tab are causing a problem. I will finish building the board until I get 16 clearence errors. Then change the clearence value to 4mil. Since there are 5 pads 9mil apart on both sides of he board, this will mean that all of the errors are due to Eagle wanting 16mil separation between the pads for 8mil of clearence, the board will pass with no errors and I will generate my gerbers error free.

    There should be 9mil of clearance between the pads IF you have created the part exactly per the datasheet and the pads are the same when viewed in the board as in the library. You said that they were not the same in the board and if this is the case then this will be caused by restring. I don't think there is any other reason for the pads physically being different between the board and the library unless the part in the board is not actually the same part as in the library and is maybe referencing another copy of the library part elsewhere.

     

    EAGLE doesn't need 16mil of separation for 8mil of clearance so although dropping the DRC to 4mil will clear your errors I think your reasoning for why it's working is not correct. If you are happy clearing the errors this way rather than a) fixing the real issue or b) just approving the DRC errors then thats fine, go ahead and generate your gerbers and move on as you've spent far too long on this.

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