Any Way to identify double hits (Via)?

Wouldn't it be easyer to setup drc rules to accept stacked via 's ?

My problem is how to detect 2 same via overlap each other but has slight different xy position at same layer?

These 2 vias have same net. So, if I on the same net drc, I will get alot of drcs.

My problem is how to detect 2 same via overlap each other but has slight different xy position at same layer?

These 2 vias have same net. So, if I on the same net drc, I will get alot of drcs.

Hi Alice,

Here's some code for you to try:

defun( getDuplicateHoles (locs @key blindBuried, (tol axlMKSConvert(0.2 "mm")))
 let((loc, dupes)
  while(locs
    loc = car(locs), locs = cdr(locs)
    if(blindBuried then
      when(setof(pt, locs, and(cadr(pt) == cadr(loc), samePoint(car(pt), car(loc), tol)))
        dupes = cons(loc, dupes)
      )
     else when(setof(pt, locs, samePoint(pt, loc, tol)), dupes = cons(loc, dupes))
    )
  )
  dupes
))

defun( same (x1, x2 @optional tolp, tolm)
  unless(tolp, tolp = expt(10, -2 - cadr(axlDBGetDesignUnits())))
  cond(
    (!x1 && !x2, t); Both are nil
    (!x1 || !x2, nil) ; One, and only one, is nil
    (!tolm && abs(x1 - x2) > tolp, nil)
    (tolm && x1 - x2 > tolp, nil)
    (tolm && x2 - x1 > tolm, nil)
    (t, t)
  )
)

defun( samePoint (pt1, pt2, @optional tolp, tolm)
  unless(tolp, tolp = expt(10, -2 - cadr(axlDBGetDesignUnits())))
  and(same(car(pt1), car(pt2), tolp, tolm), same(cadr(pt1), cadr(pt2), tolp, tolm))
)

 Cheers, Dave

Hi Dave,

This is exactly the type of issue that I am trying to address - duplicate drills with the exact same xy and touching drills and then create a report file for them. Fab shops desire the report file so they can modify the NC drill file so not to make double or more hits on a single hole. Is it possible for you to expand on your code slightly to create a simple report file? The duplicate drills are also counted in the drill legend, but that is another issue.

Much appreciated!