Electronics Forum: stencil (Page 420 of 540)

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

PCB Cleaner/washer suggestions

Electronics Forum | Thu Oct 07 12:14:14 EDT 2004 | bschreiber

The pre-solder cleaning of misprinted PCBs can be a completely different experience from a post-solder application. While the paper that DaveF references is excellent, you may want to read the paper by Richard S. Clouthier, "SMT Stencil Cleaning: A

SMT Cell Layout

Electronics Forum | Thu Nov 18 11:47:17 EST 2004 | Nate

We currently redoing our floor layout and need to squash our SMT line into a smaller, rectangular cell. We currently use a manual printer/stenciler, pick and place, reflow oven, and aoi inspection machine. Can anyone give me any links to any differ

Zestron SD301 Vs Isoprophyl Alcohol

Electronics Forum | Wed Dec 01 15:07:16 EST 2004 | bdrobinson

Hey all, I am currently looking into switching from using Alcohol in our screen cleaner to Zestron SD301. I am confident that it will clean our stencils better, but the cost of Zestron is 3 times that of alcohol. Has anybody done any studies o

0402's and Gluing.............

Electronics Forum | Wed Feb 09 12:31:54 EST 2005 | russ

We are not doing this right at the moment but I have done it with great success. Of cource it depends on your pad layout we have a 20 mil gap in between pads, we printed at 10 mil wide with a 5mil stencil. I will try to find the glue we used, I kno

Type 3 powder with BGA

Electronics Forum | Mon Feb 21 17:56:44 EST 2005 | davef

You want approximately 5 particles minimum across the smallest aperture. So in the case of a 0.8mm device, we use .017" pads with a round 0.020" aperture on a 6 thou thick stencil foils. Here, 0.020" diameter equals 0.50mm. This gives us 0.50/5=10

Solder paste height checking

Electronics Forum | Mon Feb 21 04:04:21 EST 2005 | abhirami

1.67 always on the sample boards measured. This is very fast and pretty good measurement for a paste dispense control. Boards do not stand out-side for long times. Inspect the height for critical components only, in the initial stages. Once your Cpk

dry solder paste

Electronics Forum | Tue Feb 22 17:57:32 EST 2005 | Austinj

Most solder paste has a shelf life of 1 week at room temperature after opened, if resealed at the end of the shift/day. Most shelf lives are 4-6 months at 40F (refridgerated) or 1 month at room temp (unopened/sealed). Recommended stencil life is appr

Stencil sink stink

Electronics Forum | Mon Mar 21 08:57:29 EST 2005 | davef

Se�or Tech Possibilities are: * The vent on the drain line is blocked. Generally when this happens, the blockage, like come critter building a nest in the pipe, is found on the roof. In this case, the smell would be constant. * Somewhere, the drai

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