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Padstack with multiple drills

gonuclear

Hello,

I'm trying to create a padstack with multiple drill holes.  I need a pad with a  1.7mm drill in the center and smaller .9mm drills in a circle around the center one.  Like a clock.  Has anyone ever done something like this? I have orcad 16 and the pad designer only lets me do multiple drills in rows and columns. And only one drill size.   This is for a threaded metal stud that will be solder to the board.  The smaller holes will help with the grounding to the inner plane when soldered.  If I can't do this can I create a part and put the smaller hole as mechanical pins inside the pad of the larger one.  If so what kind of error will I get and will they relief to the plane if I do it this way?

Thanks

  • Randy R

    I would make it as a part.  I would add the smaller holes as pins in the logic symbol so they attach to the ground plane(s).  On the physical part there would be the multiple padstacks (light blue) encompassed by an etch shape (orange).

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