Electronics Forum | Mon Nov 25 12:32:20 EST 2002 | davef
Now that is a BIG step. Stencil type: * A metal squeegee is fine with stepped stencils. * A rubber squeegee is fine with stepped stencils. Comments on step stencil "keepouts" are: * Use an ample space around the stepped down component pads that is
Electronics Forum | Fri Feb 24 08:29:25 EST 2006 | davef
Step stencils are not widely used, due to: * Higher cost as compared to uniform thickness stencils * Danger of solder paste smearing at least close to the steps * Difficulty of cleaning the stepped stencil underside (the steps cannot be on the upper
Electronics Forum | Fri Mar 07 12:02:40 EST 2008 | jdumont
http://www.amazon.com/SMT-Step-Step-Collection-2006/dp/1593700873/ref=sr_1_1?ie=UTF8&s=books&qid=1204909337&sr=8-1
Electronics Forum | Thu Jan 05 10:36:46 EST 2012 | davef
Singulation is much faster and cleaner than routing Here's a link to a fairly recent article on gang sawing CSP http://www.electroiq.com/articles/ap/print/volume-9/issue-10/features/step-by-step/step-11-the-back-end-process-singulation-step-by-step.
Electronics Forum | Thu Jan 28 22:27:00 EST 2021 | emeto
Nowadays is not a big deal to cut step stencils. Stencil houses charge you around 100USD per step in addition to your regular price. Some places are welding the step area with a very small clearance and I have to say mostly it is pretty accurate. In
Electronics Forum | Sat Aug 05 09:22:34 EDT 2000 | Dave F
Stencil, Step Down. A stencil of varying thickness that allows printing different amounts of solder paste or adhesive. Most stencil suppliers make stepped stencils Step stencils are used when there are fine pitched device amoung coarse pitched dev
Electronics Forum | Thu Jan 02 15:32:26 EST 2003 | Mark
Hello. Sometimes metal squeegees DO work with stepped stencils. You will always get much better results with metal squeegees compared to polymer blades. The only requirement for the metal squeegee to work, you need about 0.06 in clearance for eve
Electronics Forum | Thu Feb 23 18:05:53 EST 2006 | kennyg
What are some general guidelines for the minimum proximity of apertures to a stepdown on a stepped stencil. I have a step from 7 mils to 5 (one mil step each on the top and bottom). How far does the step need to extend beyond the apertures on the
Electronics Forum | Mon Aug 12 21:54:33 EDT 2019 | davef
I've never seen successful printing with a step as deep as you seem to be saying. The keep out would have to be jigundous!!!! SMTnet Technical Library: https://smtnet.com/library/files/upload/Step-Stencils-laserjob.pdf I'd guess * Maximum step
Electronics Forum | Fri Sep 24 12:37:13 EDT 1999 | Terry Burnette
.032" pitch, and OSP copper pads on boards with devices that have
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