Electronics Forum: stencil (Page 45 of 540)

Aperture size for Micro BGA stencil

Electronics Forum | Thu Jun 22 10:27:26 EDT 2000 | Igmar

Can someone please help with the aperture size on a Micro BGA stencil. I want to have an electroformed stencil made with 0.1mm (4mil) thickness. The PCB pad for the micro BGA has a 0.406mm (16mil) diameter. What size should I make the apertures for t

uBGA PCB design and stencil design

Electronics Forum | Mon Oct 21 23:48:13 EDT 2002 | harris

Hi: If anyone have the experience with the PCB pad design and stencil design for the uBGA? We meet the problem for it. The component data is 0.3mm diameter and 0.5 pitch. Could anyone tell me the PCB pad dimension, the stencil type and aperture dimes

blocking off stencil apertures with tape

Electronics Forum | Wed Oct 10 19:02:38 EDT 2001 | mparker

Why not quantify the amount of time spent taping apertures every time you want to use the stencil vs. the cost of a new stencil (about $300, usually)? Look for problems that are created by the blocked aperture method - is there rework down the line t

blocking off stencil apertures with tape

Electronics Forum | Wed Oct 10 20:54:32 EDT 2001 | davef

We're with the Ozzy's earlier posting on this thread. We make similar products, like: * Phantom products that are mostly complete and then are configured to order by adding or subtracting a couple of parts and some jumpers. * Version products like y

Re: Aperture size for Micro BGA stencil

Electronics Forum | Fri Jun 23 09:54:20 EDT 2000 | Dave F

Igmar: Chrys and JAX make good points. I'd like to add that you should be careful that you don't starve larger chip components of solder when using a 4 thou stencil.

Re: paste release from stencil - recommendations

Electronics Forum | Fri Nov 19 22:48:26 EST 1999 | mark

Steve, your comments from your stencil vendor are very interesting. Any decent laser cutter automatically cuts a trapezoidal aperture. This is just the nature of the cutting. We have a bunch of lasers (and chem-etch). You have to polish your laser cu

Thickness of solder paste from stencil

Electronics Forum | Wed Apr 10 11:45:08 EDT 2002 | mwoodall

We measure the thickness of solder paste printed onto PCBs as a control of the printing process. Generally 6 thou stencils are used and give between 6.2 and 6.8 thou. What thicknesses do other users get? Cheers! Mark

Equipment for laser cut stencil production

Electronics Forum | Fri Apr 12 10:15:12 EDT 2002 | dima

Hi! I investigate possibility of manufacturing laser cut stencils. May be someone knows about equipment suppliers for such production (lasers, e.c.t.)? Thank you in advance for your help!

Printing paste through screeen mesh versus stencil

Electronics Forum | Wed Feb 04 16:54:04 EST 2004 | mk

Hopefully this is not a stupid questions but, if you are printing low tech surface mount boards, is it possible to print through a mesh screen versus a stencil? Isn't that the way it used to be done? Like soldermask only stainless steel versus polyes

DEK Vectorguard and QTS Frame stencil systems

Electronics Forum | Mon Sep 27 14:01:45 EDT 2004 | scombs

Has anyone out there had any long term experience with either of these stencil systems? I'm looking for feedback on how the foils hold up, operator interface etc. Thanks in advance. Steve


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