Electronics Forum | Mon Feb 21 11:22:21 EST 2000 | K. Ckak
Hi Kurt, I agree with Dave F. I had exact same problem with PBGA placement. We requested our PCB vendor to plug/tent via (button printing) after HASL with SR1000 which worked well in the long run. There are couple of failure modes associated wit
Electronics Forum | Tue Feb 06 18:12:46 EST 2001 | davef
Pete makes great points. Taking a slightly different angle, use your placement equipment's software to help you. It keeps track of the number of picks and attempts for each location. Study these numbers for a week and determine the capability of p
Electronics Forum | Tue Feb 20 16:51:22 EST 2001 | davef
You should evaluate products from Datapaq, Electronic Controls Design, and Kic Thermal Profiling. Each sells very good reflow profiling equipment. Beyond the straight forward issues surrounding the question of "Does this thing produce a good profi
Electronics Forum | Mon Feb 26 20:02:42 EST 2001 | davef
First, I don�t understand why your board fabricator can�t do a good job plugging your vias. Additionally, when you consider that they forgot to plug the first batch of boards, it makes me wonder if they are desirable as a supplier. Generally, we us
Electronics Forum | Tue Feb 27 18:10:55 EST 2001 | davef
I�m unclear about � "BB training"??? "BB candidates"? Is BB [Box-??] [Bhote-??] a Design Of Experiments technique like Taguchi? As a start, the following affect the "attrition rate": * Assembly machine program * Machine calibration and maintenan
Electronics Forum | Tue Mar 20 14:35:20 EST 2001 | mnaddra
We have had a similar issues with some of our boards , However I took a different approach to the solution that I thought I would mention. There is a company Called Additive Services Inc. 603-889-1999. They have developed a process to screen lands an
Electronics Forum | Thu Mar 15 06:26:26 EST 2001 | Sal
Sorry for the lack of information provided, I'll try again : Test Points are the one's that are not soldering. The test points are round in geometry, 0.5MM(metric) in diameter with a HASL finish.The test point are no different to the ed through hole
Electronics Forum | Tue Mar 20 20:14:40 EST 2001 | davef
Electroplating [electrolytic] and dipping [HASL] are the two methods for applying solder coatings to features on boards. Disadvantages of electroplating lead / tin are: * "Weak knees" created at the edge of plated through holes. [I used to get weak k
Electronics Forum | Thu Mar 29 01:22:57 EST 2001 | chinaman
Hello everybody, Two questions came up during an audit (old topics once more): 1. we are not checking the solder paste volume/pad height after printing - others are using an AOI, but is it really necessary? We just do visual inspection randomly. We
Electronics Forum | Mon Apr 09 20:13:01 EDT 2001 | davef
First, some people wait a lifetime for ... ;-) Second, how do you guys measure the stencil aperture clog? What do you think of the Magnaplancil from Fendelaz? It�s a double fyv-blue-green CO2 laser refract-defractometer. ;-) Third, do you really
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