Electronics Forum | Thu Dec 12 10:42:52 EST 2002 | Adam
Guys Does anyone have any bright ideas with regards to masking a PLCC socket with via holes directly below the socket, prior to conformal coating ? We've tryed kapton tape and peelable masks but not with desirable results. Our coating process is a t
Electronics Forum | Thu Dec 12 15:34:59 EST 2002 | msimkin
Has anyone had any expereince with FR4 boards under the std 0.5% warpage for Bow & twist with CSP & uBGA devices on them that have caused failures. Are there any revised percentages for boards loaded with these devices that anyone knows of, istead of
Electronics Forum | Fri Dec 13 09:06:30 EST 2002 | russ
One thing I have found when using square or diamond etc... Fiducials is, if it is a HASL finish board, the finish may be thick and the fid camera will see them having rounded edges different sizes etc.. and will cause quality failures. Russ (My sp
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 | Sat Dec 14 02:51:24 EST 2002 | MA/NY DDave
Hi Thanks for this info. Hope someone new also enters. Funny I just picked up an article, too small, that writes that dots on some known pattern are used to measure distortion and then it shows distortion for square shapes (barrel and pincushion d
Electronics Forum | Fri Dec 13 11:29:30 EST 2002 | R.G. Albada Jelgersma
I am looking for a facility to fulfil my needs in tape and reeling (re-reeling and from tubes to reel), anti-static and humidity packing etc. in the EU, preferably Holland / The Netherlands / Belgium. In my search I am a bit stuck. Could you help me
Electronics Forum | Fri Dec 13 16:39:42 EST 2002 | Gris
Hi, Look for papers on SMTA there are a lot of papers on lead free rework. If you dont find any let us know here I am sure you will receive many. Here are a just a few http://www.google.com/search?hl=en&ie=UTF-8&oe=UTF-8&q=%22lead+free+rework%22&
Electronics Forum | Sat Dec 14 10:10:04 EST 2002 | davef
This is a good idea. Heck, you could fill the bags with sand, if you wanted. Like anything else in the shop, bean bags require attention and maintenance. If you don't, eventually the seams on the bags loosen / break and you have to do a "clean-u
Electronics Forum | Mon Dec 16 08:19:20 EST 2002 | Randy Villeneuve
We trasfered a product in some time ago and they were using erasers to hold down parts. Some parts will move around during wave and some parts just need to be positioned correctly after wave so hold downs are required. I personaly have never used a b
Electronics Forum | Mon Dec 16 15:12:05 EST 2002 | sueph
I made a small bean bag from 100% cotton filled with rice, to hold down small resistors that wanted to tilt over solder wave. It worked fairly well as long as I didn't try to take it off the components to soon, as sometimes they would want to stick
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