Electronics Forum | Fri Jun 10 14:22:53 EDT 2005 | pr
Are the local fids. necessary? Anyway, I can't think of any reason the local fids. would have to be spaced exactly the same distance from the part. We place BGA's and QFP's using board fids, and have yet to find a problem that local fids helped fix.
Electronics Forum | Fri Jun 08 13:29:14 EDT 2001 | dougt
Local fiducials will help component placement but will have no effect on part recognition. Local fiducials help you compensate for board skew or streatch by looking at a small area of the board vs. the board fiducials that cover placement over the e
Electronics Forum | Wed Jun 06 15:45:37 EDT 2001 | gdstanton
Looking for any insight into whether the use of local fiducials will help or eliminate component recognition issues.
Electronics Forum | Wed Jun 06 16:51:06 EDT 2001 | jax
Unless your placing micro-bga, board edge fiducials on alternating corners will provide more than enough placement correction ( Micro-bga's should also be fine depending on how your equipment maps the board ). The part data and vision recognition nee
Electronics Forum | Fri Sep 27 10:54:55 EDT 2002 | yngwie
Thank you pr. It was much appreciated. Is this mark normally act like a global fiducial/local fiducial for mBGA ? Is this a standard mark that can be read by the placement machine? what is the typical size of this mark ? are they masked ? thank y
Electronics Forum | Wed Jun 06 16:04:02 EDT 2001 | pteerink
Greg, Need to give more to get more! What are the details? What are the problems you are seeing exactly? What type of part are you trying to place? What type of machine are you using? What type of vision recognition? What type of PCB finish? Phil
Electronics Forum | Thu Jun 07 07:11:41 EDT 2001 | stefwitt
8" ). For calculation of the theta angle, the global fiducials should be placed over the diagonal. Component recognition can be improved if your vision system has different light zones. The steep light should be turned off and the flat light turned
Electronics Forum | Fri Dec 07 17:54:52 EST 2007 | ito
You need fiducial not only in printer, so i recomend to use a bga kit and rework station, in the rework station you can easylly place very acuratly the new fiducial. use some glue to keep in place
Electronics Forum | Wed Oct 20 08:40:48 EDT 2010 | xps
Hi everyone, here a question for the SMT production engineers... is possible today mount the fine pitch and ultrafine pitch devices (BGA, QFP, CSP), without using the local fiducials, but using the three standard fiducials of row card only? The corre
Electronics Forum | Wed Jun 06 20:45:54 EDT 2001 | Deon Nungaray
.020" The logic behind this is that from the time of the initial fiducial check, to the time of the critical parts placement which are typically placed last, there may be changes. What I mean by changes is that depending on what type of assembly equi
