Electronics Forum | Wed Jul 02 03:12:31 EDT 2003 | Joanna
We have been having problems with solder paste balls around fine pitch ICs and have decided that cleaning the boards in an ultra sonic cleaner may reomove these solder balls. However we are worried that the ultrasonic cleaning process may damage the
Electronics Forum | Thu Jun 16 09:13:46 EDT 2005 | russ
We use a 5 mil for 16mil pitch QFPs, Make sure that the stencil has been polished. Type 3 paste. We have used lead free no-clean, lead no-clean, and water soluble lead pastes for these packages. We set the printer for a slow stroke .7 in/min. wi
Electronics Forum | Fri Oct 18 09:27:53 EDT 2013 | dontfeedphils
I believe it's mostly worn off through cleaning solvents and the slight abrasion during the under stencil cleaning process. I couldn't say whether or not it's ever in a state that would allow it to transfer to the PCB though.
Electronics Forum | Mon Oct 14 10:53:28 EDT 2013 | emeto
0.5 if you use electroformed stencil or > 0.8 if you use laser cut. 2. Always use fresh paste 3. Uses the right printer parameters for your paste(for example Alpha likes fast release of the stencil from the board - in DEK this is called separation s
Electronics Forum | Fri Oct 18 08:54:18 EDT 2013 | emeto
Hege, the Nano coating goes on the opposite of the squeegee side of the stencil. I don't know if the cleaning paper is able to remove it little by little with the time, but I never refreshed my stencils with Nano coating and they work just fine. How
Electronics Forum | Tue Oct 22 09:20:31 EDT 2013 | swag
Yes, car rims (and brass tubas)! You finally helped me get to the bottom of this expensive issue. We fired the culprit. It's the same guy that was using the ultrasonic stencil washer to clean car parts on night shift. It might be snake oil, I don
Electronics Forum | Wed Sep 18 12:31:16 EDT 2002 | dragonslayr
My suggestion is to conduct a Design For Manufacturing (DFM)study on the assembly in question. Pay particular attention to the pad sizes, component lead dimensions and satisfy yourself that those two factors are correct. Given that pads match compone
Electronics Forum | Fri Aug 28 05:07:59 EDT 2009 | sachu_70
Do you clean the stencil manually or using the automated under-stencil cleaner on your Printer (recommended)? 1. Ensure that stencil wipes are lint-free and soaked sufficiently with solvent before use. 2. If your printer supports automated cleaning
Electronics Forum | Wed Nov 18 18:10:16 EST 1998 | fraser
| | | | | | I keep hearing about polyimide stencils, but what are they like in terms of registration and aperture accuracy? | | | | | | | | | | | Fraser- | | | | | | | | | | We use polyimide stencils with great success for our prototype boards.
Electronics Forum | Mon Nov 16 12:41:46 EST 1998 | MMurphy
| | | | | I keep hearing about polyimide stencils, but what are they like in terms of registration and aperture accuracy? | | | | | | | | | Fraser- | | | | | | | | We use polyimide stencils with great success for our prototype boards. They are
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