Electronics Forum | Sun Apr 05 18:59:15 EDT 1998 | Graham Naisbitt
Jaqueline There are so many variables in the electronic assembly manufacturing process involving more than 12 different chemistries, that it is impossible to easily identify and determine the nature and reason of such residues. GEC Hirst Research in
Electronics Forum | Fri Aug 17 08:37:47 EDT 2001 | jbieber
Gregory, I think that the profile is too radical, i.e. zone 6 to zone 7 temperatures are too far apart. I would guess that the solderjoints have not all reached 183C in zone 6 which is why the uBGA's do not have a symmetrical ball collapse. You may
Electronics Forum | Wed Aug 15 16:04:23 EDT 2001 | davef
First, responding to your question � Several things on copper dissolution in solder are: * A 50um copper wire will dissolve in 60Sn / 40Pb solder at: - 200�C solder in 55 seconds; - 250�C solder in 20 seconds; - 300�C solder in 5 seconds; - 350�C so
Electronics Forum | Fri Sep 07 15:19:42 EDT 2001 | davef
Watt tiepoo? [Cereally, you can usually fix typos after you post by using the P yellow �edit� button that shows when you are looking at your posting.] We�re had people on SMTnet that were washing their boards with a brush attached to the end of a ga
Electronics Forum | Wed Oct 17 03:24:25 EDT 2001 | djarvis
Dave, Like everyone else,I don't generally allow it. If only one component is off and that head is doing another component of the same type with no probs, ( pick-up is OK ) then I just say "don't ask me - move the bloody thing". I usually find it's
Electronics Forum | Wed Dec 05 17:23:41 EST 2001 | davef
Now there�s a conundrum. You want the �best way to clean leads�, but you want to use the worst type of flux for cleaning leads. You say, �20% copper exposed� � * What happened to the solderability protection during this two-year storage? Wouldn�t
Electronics Forum | Fri Apr 05 01:52:34 EST 2002 | djarvis
Huh, what, geez. Wazza time Jimbo? Call me a cab. Why is this gentleman retroflecting? Why would anyone make an articulatory gesture by turning the tip of the tongue back against the roof of the mouth? I don't know what this is a bout, but I can a
Electronics Forum | Tue Apr 16 14:42:20 EDT 2002 | stefwitt
I think this licensing thing was a poor decision to begin with. I can understand the reasoning for GenRad to issue a software license, to protect their product against cloning. Why Universal followed could have been caused by the take over and the
Electronics Forum | Fri Jun 14 14:25:05 EDT 2002 | davef
Good job clarifying things. So, your MELF are just rolling off the pads. So much for the rocket scientist that talked you into those �V� shaped apertures, eh? [Or taking it the other way: Wow, just think how bad it would be if they weren�t worki
Electronics Forum | Thu Sep 12 08:22:30 EDT 2002 | caldon
YOU think I could let this posting go by with out a reply??? PLEEEEASE. Genny- No matter what direction you go do your home work. This will require a lot of home work on you and your staff. If you go the contract manufacturing route GREAT!!! But hav
