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 | 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 | Mon Mar 01 13:06:55 EST 2004 | Chris
Hi I have a question about fiducial mark. Can anyone explain me how it is work?. Do you have to during programming set exactly center of the mark? or approximate point the mark and the machine during placemnt will correct it. In some P&P i have met
Electronics Forum | Wed Mar 03 04:26:58 EST 2004 | Evtimov
Hi Chris, About marks detect: If you have vision system you can recognize the fids and not center them manual. If only camera you have to put the center of the camera in the center of the mark.
Electronics Forum | Wed Mar 03 13:33:25 EST 2004 | stefwitt
How well should the fiducial be centered in the teach mode? Consider that you see the fiducial with probably 40 times magnification on the monitor. If you see the cross-hair a bit off center, then this is most likely just by a few hundreds of a milli
Electronics Forum | Mon Mar 01 13:11:32 EST 2004 | stefwitt
I published some info under http://www.geocities.com/stefwitt/Vision.html
Electronics Forum | Mon Mar 01 16:26:38 EST 2004 | rhdez
Is this problem with local fiducials or global? Is the problem on the same equipment? Is this a cad file o centroid? How are you measure the coordinates?
Electronics Forum | Mon Mar 01 20:53:28 EST 2004 | Ken
How does a fiducial work? I am going to venture a guess as how it ralates to the parts you are trying to place... A PCB fiducial is a landmark. The fiducial tells the machine where the board is located in the machine. A single fid can only deter
Electronics Forum | Wed Mar 03 09:03:41 EST 2004 | caldon
Chris- I use the SMEMA Standard as a reference. Goto http://www.smema.org and click the Council Standards link on the Home page. the SMEMA standard you want is 3.1 or http://www.smema.org/smema3.1.pdf Hope this Helps. Enjoy, Cal www.CTDI.com
Electronics Forum | Tue Mar 02 22:40:52 EST 2004 | pdeuel
To clean up other replys I will add that some most all machines have global correction. Most placements are an off sets from pcb 0,0 usually the lower left corner of the board. When the machine locates the fiduitals and these fids are not exactly whe
