Electronics Forum | Mon Oct 25 05:52:34 EDT 2010 | sachu_70
In csae you use 2 fiducial recognition, ensure that board fiducials are oriented across a diagonal and spaced far apart. Also, maintain a prefered dia between 1-2 mm for the fiducial on board to have have a better correction factor recorded during fi
Electronics Forum | Thu Apr 01 22:03:27 EST 2004 | Ken
Are you sure it was measuring a fid? Is it possible it was measuring a block-skip mark?
Electronics Forum | Fri Apr 02 16:31:18 EST 2004 | black5629
Why not use tooling pins (locating pins)? Sounds like the same accuracy...
Electronics Forum | Thu Oct 20 05:56:56 EDT 2016 | fadzril
Basically, what is the main issue which requires you to use black fiducials? Stencil mark recognition issues? Solder printer machines have ability to adjust the brightness or contrast.
Electronics Forum | Thu Apr 01 14:11:38 EST 2004 | cedams
Many years ago I remember the Philips CSM series SMT machines used a small tubular laser system for identifying fiducials on the PCB. Can anyone suggest suppliers for these devices. Thanks.
Electronics Forum | Thu Dec 09 14:10:42 EST 1999 | se
Fiducial recognition is based on finding the centroid of the gray scale density of the fiducial. Round fiducials are easier for the software to digest in most cases, but its more important what the camera sees. Gray scale or color contrast of the fi
Electronics Forum | Fri Apr 02 16:45:29 EST 2004 | cedams
Ken, You'd think so but the tooling pins only register to the drilling process for the PCB. The fiducial registers to the copper pattern and for both glueing and placing SMT components the pads are more important than the holes. That's why the machi
Electronics Forum | Sat Apr 03 19:58:53 EST 2004 | Ken
I have used tooling holes and fiucial registration since the late '80's. In fact if your maximum "vision" tolerance is +/- 0.05mm, your in the same ball-park as locating pins. It is true that fiducial registration is more accurate. However, I woul
Electronics Forum | Fri Apr 02 09:50:40 EST 2004 | cedams
Yup. It was definitely checking the fiducials as well as the block skip marks and it used to work pretty well. What it did was started at the center of where the fiducial should be and scanned left. When it found a change in contrast it scanned righ
Electronics Forum | Thu Oct 28 00:01:55 EDT 2010 | emmanueldavid
XPS, Hope the information in the above thread may help to get You right. BTW, Local Fiducial Marks are meant for specific devices in the Circuit Cards & typically selected to overcome offset or precision placement issues faced from Global Fiducial
