Electronics Forum: stencil (Page 419 of 541)

Warming up solder paste at start of days production

Electronics Forum | Thu Jul 22 06:33:28 EDT 2004 | Grant

Hi, I wondered how people warmed up solder paste at the start of the days production. I saw some paste mixers at a show, but only saw ones that mixed small solder paste tubs, not tubes. Can you get mixers that handle tubes. They said these mixers a

Deciding On pad size using just the component footprint

Electronics Forum | Thu Jul 22 12:02:52 EDT 2004 | lloyd

I'm currently having issues with a 28 terminal MLP package. I have only recently started in a new company and it seems as though the manufacturers guide lines as to pad geometry do not work (at least for us). So I now have a situation where I have 4

Solid Solder Deposit

Electronics Forum | Thu Aug 05 19:10:53 EDT 2004 | celldude

wash->ssd top->wash->sticky flux bottom side->place smt components->reflow->wash->sticky flux top side->place topside smt components->reflow->wash) ssd is basically the process of applying solder paste to the pcb with a stencil and the solder reflowe

AOI: Comparisons

Electronics Forum | Tue Aug 31 02:15:12 EDT 2004 | AOI Solution

I need to address the issue for colorful display on solder joints, for whoever researched on this machine, no one can deny it is a smart feature for visual assistance. however, it is still Mono color "gray scale" algorithm. it basically "paint" the i

Straddle Mount SMT connectors SCA-2

Electronics Forum | Thu Aug 19 05:12:41 EDT 2004 | bernardmulcahy

Hi Russ, Thanks for the reply -- It is not a double sided board so I guess I will be doing pretty much the same process as you described. I was wondering about was the tool you mentioned -- Is this just a fixture you got made locally or some specific

Lifted Lead

Electronics Forum | Fri Sep 10 17:32:59 EDT 2004 | Yngwie

We have recently faced lifted lead problem that happened on our 20 mil pitch QFP. We have infact pushed it back to the incoming quality, but still I have a few questions to bring up : 1) what is the typical coplanarity tolerance that ICs' manufactur

Labeling of SMT solder stencils

Electronics Forum | Fri Sep 24 14:42:19 EDT 2004 | jeremyt

Well, to be honest, we have not had any problems with this. We tested several old frames we had inhouse, and put them in our washers for 50 cycles, and they did not get any fluid in the frames. We simply attach the labels with sheet metal screws in

Open BGA joint

Electronics Forum | Fri Sep 17 23:19:07 EDT 2004 | KEN

What is the component ball co-planarity spec? I have encountered many ceramic and ASIC devices that specify 7 mil max. If your stencil is 4, 5, 6 mil you WILL eventually have an open joint. You must deposit solder greater than or equal to your cop

Stencil design for flex-rigid PWB

Electronics Forum | Thu Sep 16 15:28:06 EDT 2004 | rohman23

Actually, it's not even close to 3/8". It's more like 0.075"...not sure what I was smoking last night (I tried to guess on dimensions from my house, and now I have one in front of me). Anyway, to answer your question, the bulge is in between side A

Lead free Solder Paste troubles !!!!

Electronics Forum | Fri Oct 01 13:37:27 EDT 2004 | rkevin

Well Thanks for all the good advise. Lots of different opinions on this one. I took the advise to contact my current supplier of solder paste. They sent in one of their tech people along with a sales guy and we ran without much trouble. Other than a


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