Electronics Forum | Wed Feb 14 16:38:00 EST 2018 | cbart
i have seen that happen when the wrong process was utilized! your boards looked like they were v-scored and someone broke them apart, proper method would be to use a scoring separation machine.. pizza cutter. this would prevent this. its not a good i
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 08:45:02 EDT 2017 | dleeper
In my experience with similar sized parts, the nano coatings (or what ever your supplier might call them) do help with repeatable paste release. How are you cleaning your stencils? A big red flag to me is that your stencil worked fine for the first
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 | Thu Sep 07 11:39:39 EDT 2017 | swag
Two magic bullets help us greatly with fine pitch printing: 1) nano coatings (we use a DEK product) YES it really does work 2) temperature control in the printer (AC unit). Of course good quality stencil and proper cleaning of the stencil are im
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 | Fri Sep 15 09:08:01 EDT 2017 | rvines1
It gets tricky when resistors that your customer specified are no longer marked, but they think that unmarked resistors are a defect, and the manufacturer hasn't updated their data sheet to show the parts as unmarked, so you don't have anything to sh
Electronics Forum | Sat Oct 28 08:51:20 EDT 2017 | rvines1
The manufacturer I was having issues with was Panasonic. The parts we use were unmarked, but their catalog pages didn't make any mention of marking and included photos of marked parts. After 6 months of making various unsuccessful contacts with Pan
Electronics Forum | Tue Sep 12 10:30:00 EDT 2017 | sambo
Hello, We currently have Samsung CP45FV and SM45IFC pick and place machines and are looking to invest in two new Fuji NXT III SMT lines. I'm looking for a conversion software that will convert our existing programs to Fuji format. Is there any softw
Electronics Forum | Mon Oct 09 13:41:20 EDT 2017 | dleeper
developing a reflow profile is about balancing two variables, time and temperature. If its too hot, you damage parts, if its too cold, the solder won't melt. If the belt speed (time) is to rapid your temperatures will ramp to fast, if its too slow, y
