Electronics Forum | Wed Dec 13 19:40:38 EST 2000 | Jerry Wetzel, SME, EM/SME
Your profile must be precise, your stencil aperture sizes and shapes are very important, and the size of the pads on the boards should be very close to what the part manufacturer recommends. We had some trouble with hi-temp paste, and discovered tha
Electronics Forum | Thu Dec 07 13:50:10 EST 2000 | akruppa
Hi Hany, Unfortunately, as things presently stand, there is no method for posting an image directly to the forum. You can post an image to another location, such as Yahoo�s Geocities (www.yahoo.com), www.driveway.com, or any other similar site. If
Electronics Forum | Fri Oct 27 09:06:19 EDT 2000 | Dave F
John Ooooo, leave it to me to miss THOSE customers!!! Darn, as you can see from my response, I was thinking ... well let's just leave it at that. YESSS, let's use as much capacity of the heavily loaded part of the shop and not use available capac
Electronics Forum | Mon Aug 21 20:25:19 EDT 2000 | Dave F
Doug: I guess every solderability preservative has it�s fans. You know what the issue is? � A supplier that makes it�s customer happy by doing a good job processing material!!!! I�m a HASL guy myself � too much heartache with the other stuff. Giv
Electronics Forum | Tue Aug 08 20:43:41 EDT 2000 | Dave F
Tom: So is warp or is it twist? They�re different problems, possibly with different sources!!! And possibly different solutions!!! Consultants to talk to are: Earl Moon (pod@vcn.com), Werner Engelmeyer (engelmaier@aol.com), Les Hymes (les.hymes@w
Electronics Forum | Fri Mar 30 20:06:55 EST 2001 | aortiz
Maybe there's no test and I don't know where or why my customer came with that requirement (I think because in one of the board shipments he got a board were a smd resistor broke, but I think that happened because miss handling), but anyway I need so
Electronics Forum | Fri Jun 23 20:07:16 EDT 2000 | Lee
Excellent question! I'm not an expert on these matters, but I know that there is at least one Eurpoean program known as EMAS (can't remember what theacronym stands for) that addresses many of these issues. I will look into this for you and get back t
Electronics Forum | Mon Jun 18 21:20:17 EDT 2001 | davef
It�s sometimes tough to put enough paste on the board before reflow to obtain half-way adequate hole fill with components on a 0.062 inch thick board. So, a 0.093 incher, um. Yano, a lot is determined by board lay-out and how you jigger your profil
Electronics Forum | Wed Jul 11 20:24:00 EDT 2001 | davef
Well, your wipes are a good first step in removing the bulk of the material, but they do little or nothing to remove the material from the apertures. * It would probably be cheaper to use poly stencils and then throw them away after each use, eh? ;
Electronics Forum | Wed Jan 05 11:43:11 EST 2000 | Dave F
Yins, In low volume applications, using X-ray for BGA mounting process control is: 1 Very expensive approach, as you've stated. 2 Requires beaucoup operator training and interpretation of results. Which is double bad, because of the intermittent n
