Electronics Forum | Thu Sep 13 13:29:06 EDT 2001 | mparker
Dave et al, I just print out and read a copy of the aforementioned recommended article. Mr. Mangin gives a clear picture of why DPMO is to be considered a more pure data than First Pass Yield (FPY). However, I must note that his interpretation of h
Electronics Forum | Wed Sep 19 14:58:03 EDT 2001 | jschake
You provided excellent detail, and unfortunately I do not see anything out of the ordinary except the tooling issue. This brings us back to the original tooling related questions you had asked before. My apologies for questioning your process integ
Electronics Forum | Tue Nov 20 20:56:23 EST 2001 | davef
You�re correct. The release characteristics of epoxy differ from solder paste. Consider: * Using print/flood stroke, on-contact print cycle. * Printing slow enough to fill the hole with adhesive. * Overcoming the thixotropic [The viscosity of thixo
Electronics Forum | Thu Aug 29 06:48:01 EDT 2002 | yngwie
I have seen several Imm Ag pad on the assembled board which have a copper colorleaching through the silver plating This happened on the pad which was not deposited with paste during the assembly process. Don't know if it is a problem, but we only
Electronics Forum | Tue Apr 09 16:25:28 EDT 2002 | clarkk
Alan, You're right, mass inspection after assembly won't work. The inspectors will miss 25% (or more) of the defects, and the boards will be reworked before SMT operators can properly define defects and their sources. The company I work for tends to
Electronics Forum | Thu Apr 11 18:47:43 EDT 2002 | slthomas
A couple of questions to establish a baseline for when the check writers start asking questions........ How many of you have vision systems on site for BGA inspection? If you don't have it, do you do 100% X-ray, or did you just nail down the proces
Electronics Forum | Fri May 24 11:46:34 EDT 2002 | tmv
Lot's of good discussion in this string...but I think we've missed a few points. First off...turret machines are more than capable of handling the smaller component sizes (in fact, they are the best)...Machines like the SANYO TCM-3000 or Universal 47
Electronics Forum | Tue Apr 16 13:59:33 EDT 2002 | paulausten
They work great as long as your conveyor speed > has been calibrated and checked on some type of > PM schedule. On some oven types these sensors can > warn you to possible problems with the conveyor > speed. Say the oven is calculating that the b
Electronics Forum | Thu Jun 20 18:56:31 EDT 2002 | stepheno
If you don't already have one, the best investment you can make in your case is a good thermometer/humidity meter. They are not at all expensive. Then record the temperature and RH about 4 times a shift. After a few weeks (maybe sooner) you can se
Electronics Forum | Thu Jul 18 11:15:27 EDT 2002 | gdstanton
Folks, I'm working on setting up an automated process which captures data on SMT component dispensing during placement. Ultimately, I'm hoping to use it to account for component attrition (load/unload losses, vision/mechanical/electrical inspection
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