Electronics Forum: metal and each (Page 1 of 42)

Solder paste height and metal squeegees

Electronics Forum | Fri Apr 20 11:05:23 EDT 2001 | gcs

Just a bullet! My results are, .005" stencil thickness should measure between .0055" - .006" if your pressure is correct, metal blades and snap-off is set up correctly. Do you have aperture reductions at the QFP locations "typicial industry standard

Solder paste height and metal squeegees

Electronics Forum | Fri Apr 20 16:05:17 EDT 2001 | gcs

We always reduce side to side, EXAMPLE: 12 mil width reduced to .010". Do you guys check viscosity ? Also maybe your guys are appling to much pressure on the sqweegee blades.

Solder paste height and metal squeegees

Electronics Forum | Fri Apr 20 08:41:56 EDT 2001 | jimlew

For those of you out there, like myself who are still using 2-d to measure paste ht, I have 2 questions. 1. Typically, what tolerance are you applying to your ht? +- 1 mil, or what? 2. Are you using metal squeegees, and if so, have you found that squ

Solder paste height and metal squeegees

Electronics Forum | Fri Apr 20 15:27:00 EDT 2001 | jimlew

We do some aperture reductions - but it's not the 10% i'm accustomed to. Looks like it should be more than we currently do (I think we do 10% of length, but no width). Don't think we have a slumping problem, and we're not doing snap-off, only contact

Geometric Dimensioning and Tolerancing

Electronics Forum | Sat Jun 06 09:53:59 EDT 1998 | Earl Moon

GEOMETRIC DIMENSIONING AND TOLERANCING (GDT) Using and applying GDT to printed circuitry and assemblies is very much like applying it to any other design for manufacturing (DFM) or design for assembly (DFA) requirement using concurrent engineering (C

ICT and specifying PCBA testing

Electronics Forum | Tue Nov 01 14:46:31 EDT 2011 | davef

Agilent TestJet Technology White Paper In the early 1990s, the testing of digital parts became problematical. Previous in-circuit test techniques sought to ensure a correct, functioning part by applying digital patterns, called vectors, to the input

Cleaning prototype PCB assemblies and waste water

Electronics Forum | Fri Jun 22 11:18:23 EDT 2007 | agillman

I realize I am jumping in late but here is some REAL information. Waste water is controlled by EACH POTW (waste facility). It is NOT centralized as in EPA. The POTW's are primarily concerned with what might damage their pipes. First among their conce

SAC 305 Reflow & SN100C Wave and Selective

Electronics Forum | Thu Feb 15 13:47:16 EST 2007 | russ

They are all compatible with each other. Data is at alpha metals website and FCT assembly Russ

and you think youve got it hard

Electronics Forum | Thu Jul 06 13:29:42 EDT 2006 | Chunks

Unfortunately it's not what you know, but who you know. Sounds like it in your case. Tread lightly as this guy may become your boss. It happened to me. New guy comes in, couldn't tell the "red stuff" from the "gray stuff" (adhesive / paste in cas

Foam fluxer maintenance, storage and cleaning

Electronics Forum | Sun Nov 08 15:27:25 EST 2015 | davef

Thinner: Flux thinner, NOT paint thinner We kept a spare stone in thinner in inventory. We cut PVC pipe to size, cap in one end, screw thread on the other, stone inside, filled with flux thinner and covered with a screw cap. I don't remember who we

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