Electronics Forum | Tue Sep 25 14:08:59 EDT 2001 | davef
Oooo, the solder on the pad and PGA ball is flowing during reflow down the via to the secondary side? Why didn�t you say so?? ;-) Why would you expect that gravity and capillary action wouldn�t force solder to flow down the solder plated via to the
Electronics Forum | Fri Nov 02 11:23:52 EST 2001 | dougt
Here's my 2 cents....... I worked for a small company that manufactures pick and place machines and had the task of testing/troubleshooting and the dreaded calibration. These machines used vision for part orentation and have what I considered aweso
Electronics Forum | Mon Dec 03 21:46:04 EST 2001 | davef
GET ANSWER? Shore. Tks t'all. DA DRILL? Naw, never found it. I worked at this plant down in Arkansas, where we cooked dirt. [Got it so hot, it glowed orange.] Virtually everyone in the plant had a wauky taukie. About half of the 2-ways would g
Electronics Forum | Wed Dec 05 17:48:58 EST 2001 | Mike Konrad
There are a few good de-fluxing chemicals and many more �not-so-good� de-fluxing chemicals. As a manufacturer of cleaning equipment, it is imperative that our customers use a de-fluxing chemical that: #1: Removes flux #2: Is environmentally safe
Electronics Forum | Tue Feb 19 19:36:21 EST 2002 | davef
You weren�t clear but I assume the problem is not widely distributed and affects only a few parts on each board. Do this trick: * Cut a ~1� piece of fairly serious wire, like 18 or 12 AWG. * Strip the insulation. * Gear-up with gloves, glasses, and
Electronics Forum | Wed Jul 24 01:53:58 EDT 2002 | Mike Konrad
Using ultrasonic technology to remove adhesive is normally not that difficult. I do not know who�s machine you are using (perhaps its ours). In any case, here are some tips for removing adhesives. 1. Heated wash chemistry works better than ambien
Electronics Forum | Wed Jul 31 17:36:32 EDT 2002 | davef
Basically you need to do two things 1 Look at and print drawings you get. 2 Keep track of where those drawing are stored. LOOKING AT AND PRINTING DRAWINGS YOU GET. Use: * Same software that your customer used to create the drawing. [Oh, lots of cu
Electronics Forum | Thu Sep 19 11:14:45 EDT 2002 | Jim M.
We had lots of problems with bridging on 15.8mm pitch, QFP17-160 at the start.The board was .032 thick, double sided-six boards to a panel. Here is the problems (not neccessarily in the biggest to little but as i remember them) and solutions that he
Electronics Forum | Wed Sep 18 18:40:05 EDT 2002 | dougt
Here is how smema works: Machine A has a board to give to machine B. Machine A has an opto or a relay that will turn on or close when it is ready to pass this board to machine B. This is the "board available from previous" signal, telling machine B
Electronics Forum | Thu Sep 26 14:03:55 EDT 2002 | Randy V
There are allot of issue to washing that need to be considered before you purchase a washer. But to answer your question regarding ultrasonic cleaning: 1. Ultrasonics with the correct frequency will not damage most components. Washing in general can
