Electronics Forum | Thu Dec 19 13:17:20 EST 2002 | gramsey
Huh?! The area of a square that fits in a circle is clearly less than the circle. Paste release is better in a circle than a square because the circle has maximum area per perimiter lenght.
Electronics Forum | Fri Dec 13 18:47:22 EST 2002 | stefwitt
In theory you are right, but the camera CCD chip has only small squares as pixels. The edges of the circle lit the pixels only by a certain percentage. In order to find the edges, you will have to use sub-pixels or greyscales. A circle is also prone
Electronics Forum | Thu Jan 19 13:28:19 EST 2012 | waveroom
Two pictures. Dark circles around solder joints. leaded solder, water soluble flux, selective soldering and seeing these dark lines circling around solder joints. Can not remove this either. Any idea what is making this occur??? See attached photos
Electronics Forum | Sun Mar 25 12:21:35 EDT 2007 | diesel_1t
http://www.freescale.com/files/32bit/doc/package_info/AN2920.pdf hopefully this help you. also we always look on X ray for some misplacement; you can see like a dark circle and another lighter circle with an offset between both circles (meaning dar
Electronics Forum | Thu Mar 19 16:06:29 EDT 2020 | stephendo
Imagine a circle. Now imagine a line attached to that circle. A line almost as wide as the circle. Or look at a regular BGA pattern now imagine if the traces were almost as wide as the pads. I have not seen any quite as bad as he describes but I have
Electronics Forum | Wed Feb 21 05:52:17 EST 2007 | Stephen- SMT engineer trainee
Some of the blister in solder mask, normally 1 circle blister(about 1cm in Dim.) in each PCB. In addition, there are also blister in laminate, the also look like 1 circle blister(about 1cm in Dim.) in each PCB.
Electronics Forum | Tue Sep 06 09:47:12 EDT 2011 | dyoungquist
We use a 40mil circle with the solder mask backed off another 40 mils (120mil circle) beyond that. Works good for us but not sure if that is an industry standard or not.
Electronics Forum | Fri Mar 26 21:48:56 EDT 2010 | dman97
Can someone explain to me what I'm supposed to do after I have done the vision offset calibration procedure? The manual tells me to put solder paste down on all 25 holes of the stencil. After this the board drops down and the machine scans each fidu
Electronics Forum | Fri Aug 17 11:10:48 EDT 2001 | vickij
Thanks, Dave. Asking some of the product engineers just got me run around in circles.
Electronics Forum | Wed Nov 03 05:42:33 EST 2004 | Rob
I hear it's becoming quite fashionable in certain circles.