Electronics Forum | Thu Dec 09 13:41:13 EST 1999 | JAX
IF YOU READ FIDUCIAL MARKS THAT ARE PARALLEL TO EACH OTHER THE PLACEMENT WILL NOT BE AS GOOD. ONE OF THE PROBLEMS WITH THIS METHOD IS IT COMPLETELY THROWS OUT THE CONCEPT OF BOARD STRETCH IN ONE AXIS. THE OTHERS MAY VARY DEPENDING ON WHAT MACHINES YO
Electronics Forum | Sat Dec 11 11:01:11 EST 1999 | Mark W.
In answer to your question no. Fiducials should always be as far apart from each other in both directions (X,Y) as possible. This will allow ANY placement machine to calculate the EXACT location and rotation of the PCB, and therefore correct the moun
Electronics Forum | Thu Oct 21 06:26:50 EDT 2004 | dennispoquiz
Right. Fiducial comes with the CAD data or the gerber files. If it doesnt, and you need to create fiducial coordinates, you may use a digitizer or a caliper and make use of the reference pin as the origin. Now if the fiducial camera focus is way out,
Electronics Forum | Tue Jan 30 08:21:02 EST 2007 | GS
Please who can help me? I am looking for fiducial (cross shape) mark (target mark? Swiss mark?..)specifications used when COB wire bonding on PCB laminate. Pad pitch should be 250umm may be 220umm?). Mainly need to know which are the tolerances
Electronics Forum | Tue Jan 30 17:58:49 EST 2007 | flipit
Hi, I would not be too concerned about what the shape of your wirebonding fiducial is. Cross, Square, Diamond, Circle, will all work well for you. I use a "+" and a diamond. Your machine magnification will be great, so don't make the fiducials to
Electronics Forum | Wed Jan 31 17:30:54 EST 2007 | GS
Thanks a lot flipit, I am not directly involved in this "problem" but is my friend that have his CM rejecting PCBs because it says the "+" mark (spokes lengths) are out of tolerances. It seams CM bonder's require tolerance +/- 0,05(? not sure). I d
Electronics Forum | Thu Aug 18 18:33:15 EDT 2005 | darby
Search for this posting "Component Location Related to Fiducial Marks" from 9/06/04 by Joe O.B.
Electronics Forum | Wed Aug 17 15:30:56 EDT 2005 | DannyJ
Hi Jaya, Here's a definition, towards the bottom of the listing... http://en.wikipedia.org/wiki/Fiducial Mainly, a 'global' fiducial refers to the outside of the board, usually on the scrap rails. This allows the machine to locate two reference
Electronics Forum | Wed Aug 17 13:00:41 EDT 2005 | Jaya
Hi There, I'm Jaya, would like to understand in details about global fiducial mark.Can anyone share with me or either give me some reading material about this.. regards Jaya
Electronics Forum | Sat Aug 20 15:08:32 EDT 2005 | Jaya
HI Darby & Danny. Thank YOu. I have got the information. With your help,I u'stand and start asking my supplier to run the boards with glb fid's which also accept by Customer. regards Jaya.
