Electronics Forum | Fri Aug 03 12:24:14 EDT 2001 | hinerman
I can only describe how the Grid Lok handles component variability. The compliant caps have an annular ring that is very soft and can mold to different shapes. If a component shows up where there was no component before, the outside of the cap bend
Electronics Forum | Mon Dec 13 00:48:33 EST 1999 | armin
Hi All I have a 0.7 mm diameter hole for vias, what�s the minimum annular ring for this hole diameter? What�s the term unsupported and supported holes refer to in IPC-2221 9.1.2 Annular Ring Requirements? I have a proto-type PCB (designed by our R&
Electronics Forum | Tue Dec 17 17:47:49 EST 2002 | Tim Marc
Dave, I�m talking about the 75% vertical fill of solder IPC 6.3 criteria (B), and 6.3.1 Fig 6-5. I also referred to the annular ring of the Plated-Through-Hole, being coated with solder mask. Semantics, yes I did refer to the Plated-Through-Hole (Sup
Electronics Forum | Thu Feb 13 07:13:39 EST 2003 | davef
Tell us more about the location of the bridging [ie, front-to-back, back-to-back, front-to-front, etc]. Thoughts are: * Your annular ring around the hole seems large. You have 0.007", consider 0.003" to be the minimum. Your board fabricator can gi
Electronics Forum | Wed Nov 02 21:58:17 EST 2005 | KEN
Copper wire will become thinner when dipped in tin/lead or lead free solder. The copper is disolved off of the bulk wire. This is one reason rework on solder pots must be restricted. Eventually, after repeated cycles you will have smaller and sma
Electronics Forum | Thu Nov 08 08:44:22 EST 2007 | aj
Hi, I have just taken a look at the Connector Images. Is there a difference in pitch between both connectors ? From the photo it looks like the Annular Rings are oversized on Image #1 especially around the centre area ( this might be the image ).
Electronics Forum | Fri Nov 09 07:13:20 EST 2007 | hussman
You're joking rite? I mean the pitch between these two connectors is night and day. Of course you will get shorts on the 96 pin connector because your leads are right on top of each other. Now, what to do about it: You took a picture of the top o
Electronics Forum | Thu Aug 14 21:58:43 EDT 2008 | proy
NO WAY I had seen this 10 years ago, and got into a 'p' match with the PCB fabricator. We had failures after wave solder, the thermal ezpansion caused cracks in the 'knee' where the skinny little trace go's over into the barrel. even if not failin
Electronics Forum | Wed Jun 12 12:35:03 EDT 2013 | deanm
Dan, Can you upload a picture of the bridging? Why oval pads? Have you considered using round pads with the smallest practical annular ring? In my opinion, an oval pad would potentially hold more solder because there is more exposed area, and the m
Electronics Forum | Fri Nov 08 17:49:05 EST 2013 | davef
First, it's a surprise that your failure analysis lab thought everything was OK with these boards. They look like shit. Second, a few years ago, there was a bunch of complaints about ENIG boards with issues similar to what you're observing. There wa
