Electronics Forum | Tue May 08 04:58:12 EDT 2001 | Kemosabe
I've never heard of such thing!!! We do occasionally have problems with fiducial recognition and have a difficult time convincing our operators not to use pencil erasers on them. The erasers take care of the recognition problems, but leave shavings
Electronics Forum | Tue May 08 08:41:29 EDT 2001 | caldon
Hmmmmm........I am thinking!!!!! Cleaning is the final process in our situation. After cleaning we have no need for the fiducials. Is the haze causing fiducial recognition problems? Ideally what you are looking for is a contrast between fiducial and
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 | 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 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 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 | 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 16:39:15 EST 2004 | stefwitt
We had a similar system on the Siemens machines, quite some time ago. However, it was not a laser light but a LED and a fiber cable. Actually the center fiber or receiver was surrounded by a bundle of small fibers for the LED light source. You may al
Electronics Forum | Mon Apr 12 09:39:38 EDT 2004 | cedams
Ken, Thanks for the feedback. Unfortunately (or fortunately) I am in Mexico and we make our own PCBs. That is another conversation entirely and another of my fix-it projects but currently we drill the PCBs and align the artwork to the holes visually
