Electronics Forum | Wed May 29 17:17:49 EDT 2002 | wilcoxito
As far as aperture dimensions go, I found a technical note written by Micron that recommends using "square apertures with sides equal in length to the diameter of the PCB pad. The corners of the square should also be slightly rounded, and the apertu
Electronics Forum | Mon Jun 10 01:37:58 EDT 2002 | ianchan
Seje: Hi mate, I work in a manufacturing PCBA plant(factory). I hold the title of "Engineer" under our company org chart. Sales and marketing is not within my portfolio. So I am not seriously offended by that poke at salesmen. However I put mysel
Electronics Forum | Sat Jun 08 07:06:21 EDT 2002 | cyber_wolf
At each of the machines we have a log book.One of the sections that the operators fill out in the log is called machine downtime, and next to it is a comment section.Any time the machine is not placing parts they make a quick note of why they are dow
Electronics Forum | Thu Jun 20 17:40:03 EDT 2002 | pjc
Depends on which Assembleon machine, aye? The "GEM" line, Topaz & Emerald, stuff is Yamaha- Japan, which I consider more along the lines of Juki and i-Pulse (Tenyru/Yamaha), and maybe Samsung. The "Power" line, ACM & FCM, on the other hand is pure Du
Electronics Forum | Thu Jun 20 04:41:47 EDT 2002 | redmary
thanks, but I also encounter the solderability problem. because these boards are HASL or Ni/Au finish, and we print the solder paste and reflow, the result shows the some non-wetting area. and the reliability test also proves to be bad. so the critic
Electronics Forum | Mon Jun 24 21:56:15 EDT 2002 | davef
Russ is correct. The sales-types telling you these stories are not acting reputably. You should not allow them in your plant. If you do not control the sales-types that gain entry to your plant, ask that person to come on-line here and we will exp
Electronics Forum | Mon Jul 01 15:37:56 EDT 2002 | pjc
Possible cause can be design related- if the solder land is too small. Check w/ IPC SM-782 Solder Land Design Guide Another is board finish. I have seen problems like this with Gold finished PWBs- which creates a more brittle solder joint.Another pos
Electronics Forum | Tue Jul 02 21:47:44 EDT 2002 | alex_kirichenko
Hello everybody!!! We are going to start loading 0402s and I'm looking into all diffirent sorts of problems. From this forum I see that tombstoning is the main one. I found article about using U-shape appeture design for 0402s. I never had stenc
Electronics Forum | Wed Jul 03 14:08:10 EDT 2002 | gbriceno
I' designing a PCB with SMD components to optimize the land patterns for wave soldering. I find that the IPC-SM-782 land patterns are not robust enough for wave soldering, yielding ramdom skips and bridges. This PCB will also give me insight on sha
Electronics Forum | Wed Jul 10 13:33:40 EDT 2002 | bentzen
Hi You might be right that the ban will go ahead eventhough some indications, like the report from Germany, show it will be an environmental drawback. In Denmark I�m aware of 2 lead-free invetigating projects on the way. I participate in one of t
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