Electronics Forum | Tue Sep 19 09:41:30 EDT 2017 | sumote
Steve, The 4 things I would do, and in this order: 1. Clean your stencil with stencil cleaner wipes after it comes out of the stencil cleaner. I like MicroCare ProClean (MCC-PROWR). I will even saturate the wipe with a bit of isopropal just till
Electronics Forum | Wed Nov 27 16:11:23 EST 2002 | davef
In my haste to respond, I neglected to ask THE QUESTION. What is it about your current process that you would like to improve? While we're at it, tell us more about your: * Stencil * Paste * Printing process and set-up
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 | Tue Oct 15 19:27:08 EDT 2013 | swag
See if you can get a sample of Dek's Nano Protek. We use it on all our fine pitch stencils. I'd say it's kind of like car wax for the aperture walls. They operators really like it a bug me every day to order more if we run out.
Electronics Forum | Thu Sep 07 07:36:57 EDT 2017 | tsvetan
we use 0.12 mm stencil with 0.3 mm apretures for 0.5mm step FBGA153 memory without problems the solder paste is SAC305 Class4 http://www.olimex.com/Products/Components/Soldering/SOLDER-PASTE-SAC305-CLASS4/
Electronics Forum | Thu Sep 07 11:35:45 EDT 2017 | slthomas
That is a good point, and was something that we discussed yesterday in our process eng. meeting. I don't have an answer right now as to the current cleanliness but I know they were washing (U/S) the stencil repeatedly during the previous run and in
Electronics Forum | Fri Sep 22 14:10:19 EDT 2017 | slthomas
Just for the sake of passing along the information, the fine grained stencil provided zero improvement over the standard PhD stainless and was not nearly as helpful as the baked-on nano-coating. We probably won't be trying that again unless we go und
Electronics Forum | Tue Sep 19 13:09:48 EDT 2017 | slthomas
Thanks, all, for your responses. It's always helpful to know what everyone else is doing, whether to validate your own experience or to force you think in more detail. At this point we've determined that no amount of aperture design, material contr
Electronics Forum | Thu Dec 06 08:57:32 EST 2007 | davef
With this small amount of background information on the situation, comments are: * If you let adhesive cure on your stencil, you should not be using Zestron 301. A hammer and chisel is more effective. * Assuming you are not letting the adhesive cure,
Electronics Forum | Fri Sep 08 01:08:10 EDT 2017 | tsvetan
The material is 0.12mm stainless steel, electropolished it's thick for fine pitch but we have lot of other big components on the board which do not solder good if we use 0.1mm thickness stencil. The 0.3 mm apretures are big enough and have good rele
