Electronics Forum: lpkf

Re: Quick Frame and Dek 265GS

Electronics Forum | Wed May 20 12:01:16 EDT 1998 | Chrys

Have you tried the new Accu-Frame from PNC? It tensions on all four sides using an operator-INdependent mechanical scheme. It seems pretty slick. They're failry new, and don't have a frame for the MPM's last time I checked, so I haven't tried it m

paste release from stencil, and volume calculation

Electronics Forum | Sun Nov 07 10:54:21 EST 1999 | Steve Thomas

We're looking at redesigning our stencils to facilitate better (well, it's pretty much non-existant, so any improvement is a big leap) release from fine pitch apertures. Currently we have perpendicular walled laser cut apertures. We'll be having

0402 tombstoning and dewetting on QFP256 trade-off

Electronics Forum | Thu Mar 05 11:53:09 EST 2009 | dcell_1t

Hello to all. for certain time, we have been struggling with some issues on a PCB where have tombstoning on 0402 components (due to pad design) and dewetting in qfp256 0.5 mil pitch (discussed on another threads on this forum) component, we have pro

Re: paste release from stencil, and volume calculation

Electronics Forum | Tue Nov 09 17:12:38 EST 1999 | Dave F

Steve: Addressing your points: 1 FINE PITCH APERTURES Electropolishing Laser Cut Stencils: Laser cut should not requiring polishing. Geesh, how much money do you have for stencils? ;-) Oval Shaped Apertures: Pass. What do you expect to gain f

Pick and Place Startup - LQPF100 bridging issues

Electronics Forum | Thu Mar 25 20:09:35 EDT 2021 | grahamcooper22

What is the QFP pitch ? What aperture dimensions have you chosen ? Is the stencil laser cut then polished ? Your AFTER stencil size looks promising...your BEFORE stencil aperture size looks disastrous...would surely give bridges.. Your pcb pad siz

Step down stencils using CBGA and 20 mil QFP's

Electronics Forum | Thu Oct 21 14:02:32 EDT 1999 | Ron Costa

We are a contract manufacturer currently building a job with IBM CBGA-255 devices and 20mil QFP's that are close to each other. We use a 6 mil laser cut and electro polished stencil with one to one apertures on the BGA's. The customer is experiencing

Stencil type and design for 0.65mm pitch QFP100

Electronics Forum | Wed May 10 01:00:09 EDT 2000 | gary

0.65mm pitch QFP. I believe that this is the borderline for Fine Pitch. Will I have a good paste release with Chem-etch matched with a rubber squeegee? I'm planning of a 15% reduction on the Width and no reduction on the length. Any feedback whether

Re: paste release from stencil, and volume calculation

Electronics Forum | Mon Nov 15 12:13:41 EST 1999 | Dave F

Steve: There are guidelines for determining if your aperture has the correct proportions to the foil thickness. Maybe that�s what you�re looking for: 1 Aspect ratio = aperture width/foil thickness Chemically etched SB GT 1.5 Laser cut SB GT 1.2

Re: Adhesive Dispenser Vs. Screen Printing Adhesives Pros and Cons

Electronics Forum | Thu Oct 12 22:16:59 EDT 2000 | Dreamsniper

Hi Guys, I'd like to share this to all of you...you can start playing with the rests...Stated prices, if not indicated, are in Aussie $ or Singapore $. Stencil Printing Adhesive Pros a) Less Capital Equipment Cost (Short Term). In reality it is f

Re: paste release from stencil, and volume calculation

Electronics Forum | Sat Nov 13 14:09:45 EST 1999 | se

First, let me say what I always say: a good chem-etched stencil will print fine pitch. Chem-etch brings trap to the side walls because its a physical by-product of the process. Because they are less expensive you can add electropolish and still save

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