Actions
Forum Thread Details
  • Replies 4 replies
  • Subscribers 178 subscribers
  • Views 340 views
  • Users 0 members are here
Related

Pad Dimension Errors - New User

Former Member

Hi,

 

I'm new to Eagle.  I've searched for an answer to this, but maybe I don't know enough to search for the correct terms.

 

I built a package in the library for a through hole header with 1.27 mm spacing and 0.7 mm holes, as per the manufacturer's datasheet.

 

If I allow Eagle to set the pad size, it sets it to 1.2 mm.  That leaves only 0.07 mm of spacing between pads -- not enough.

 

If I manually set the pad size to 1.0 mm in the library, it does not change in the board and I stll get DRC errors.

 

I've gone through the DRC dimensions and sizes and don't see anything that would cause this.  Besides, it seems to be elsewhere because the change in the board occurs before I do a DRC.

 

Can anyone give me pointers or direct me to documentation that would help me?

 

Thanks!

 

Dave

  • Do not use the "auto"-parameter for the pad-diameter. The DRC changes all

    auto pads image

    Always set your own pad diameter.

    r

     

     

  • in reply to Former Member

    Thanks for the reply.  But I said:

     

    "If I manually set the pad size to 1.0 mm in the library, it does not change in the board and I stll get DRC errors."

     

    So setting the pad size manually doesn't work for those dimensions.

     

    Dave

  • in reply to Former Member

    Dave Wills wrote:

    Thanks for the reply. But I said:

     

    "If I manually set the pad size to 1.0 mm in the library, it does not

    change in the board and I stll get DRC errors."

     

    So setting the pad size manually doesn't work for those dimensions.

     

    Dave

     

     

    The DRC rules always come into play. The final size on the board is the

    'larger' of your pad diameter set in the library package or the size

    calculated by the DRC settings based on the drill diameter. Said the other

    way around, you can only control the pad diameter in the library if it

    exceeds the one calculated by the DRC. So for a given hole size you will

    need to change the restring percentage figure to reduce the pad diameter.

    This figure will apply to all pads on the board.

     

    HTH

    Warren

     

    --

    Viewed / responded via the newsgroup at

    news.cadsoft.de

     

     

     

  • in reply to Former Member

    Hi Warren,

     

    Yes, that helped a lot.  I went back to the manual and studied up on Restring and distance, then tried some things until I understood what was happening.

     

    Not sure if I can get this board fabbed yet, but I'm learning.

     

    Thanks to you and Josef-Michael for helping to educate me.

     

    Regards,

     

    Dave