Electronics Forum | Wed May 24 13:42:27 EDT 2000 | John McGriff
We just had a similar problem with misplacement, and it turned out that the designers had not put the local fiducials in the right places. I am told that placement machines typically recalculate the component centroid to be at the center of a line b
Electronics Forum | Fri Jun 10 12:05:54 EDT 2005 | jdumont
Hi all, we are just getting into using local fiducials for BGAs. My question is, in addition to having to be on the same diagonal (opposing corners) do the fiducials have to be the exact same distance from the center of the part? I always thought yes
Electronics Forum | Tue Feb 20 14:39:59 EST 2018 | harlymh
Is it good practice to use a PCB mechanical drill hole as local fiducial? Would it increase my placement accuracy? Or should I stick to my panel fiducials? We're using a panel with 4 boards and we're trying to reach a 50 microns accuracy.
Electronics Forum | Thu Oct 19 16:35:22 EDT 2006 | jdengler
Steve, I believe Contact Systems is the only company that uses local fids in this way. All othe machine have coordinates for the local fids. When measuring the fids it applies any error from the fid measurement to the 1 component it's linked to.
Electronics Forum | Fri Jun 10 13:00:34 EDT 2005 | russ
Depends on your machine.
Electronics Forum | Tue Jun 14 09:51:10 EDT 2005 | jdumont
Its a Contact Systems 3Z...
Electronics Forum | Thu Oct 19 15:09:26 EDT 2006 | SWAG
Can't explain - I don't really know how it works mathematically.
Electronics Forum | Fri Oct 20 14:06:49 EDT 2006 | russ
Gotcha Steve, so then in essence if you teach the skew, then the Machine "straightens" it out then right? Russ
Electronics Forum | Wed Feb 08 11:51:13 EST 2012 | partsalesnti
Does anybody still use local fiducials for fine pitch parts in board design?
Electronics Forum | Mon Dec 14 12:02:59 EST 1998 | Greg
I have only used two global fiducials except for paneling. The only time I have ever used local fids is when I have a placement problem then I have activated the local fids for that specific part. Your best bet would be to ask Fuji America.
