Electronics Forum | Mon Sep 03 10:50:47 EDT 2007 | kissanepat1
A suggestion for your stencil which works is as follows. Cut your stencil aperatures beyond your pads to a length of 0.1mm , this then allows the paste to pull back into the pad creating a blob of solder which can be inspected by AOI.Best length and
Electronics Forum | Tue Aug 14 10:51:18 EDT 2007 | erhard
standard procedure for this would be to solder SMDs on the bottom side and the LEDs all at once on the wave - if the layout is ok for the wave. You would have to glue the SMD components, for this you would have to use a glue dispenser or a special hi
Electronics Forum | Tue Aug 14 16:50:43 EDT 2007 | rgduval
I see...said the blind man. If you've got the LED's on one side, and the SMT on the other...and you have the clearance, I'd go with the previous suggestion of gluing the SMT, and waving the whole assembly... As for stenciling....use a glue dispense
Electronics Forum | Sun Oct 28 08:32:47 EDT 2007 | davef
With a 7 thou stencil, we'd go 1 to 1. So for a more typical 6 thou stencil, we'd bump the aperture area by 1.15, maybe 1.2. We make no distinctions between 'innies' and 'outies'. Are you talking about castellations on land grid devices [ie, BCC�, L
Electronics Forum | Fri Nov 09 10:37:38 EST 2007 | devajj
We have started using QFN packages in large volume and are having problems with no-solders. We are using 6mil stencil with 1x1 paste print to pad. These also have thermal pads with thru vias that we reduce the stencil aperture by 1/4. Board also ha
Electronics Forum | Mon Nov 26 22:05:34 EST 2007 | shy
currently i'm open my stencil aperture is 80% from the land pattern. is this will cause insufficient solder at the terminal component or not? the stencil thichness is 6mil and the board run using SMT pallet which i consider there will be no option f
Electronics Forum | Fri Nov 30 23:28:54 EST 2007 | mika
BTW, Option 6. Bear in mind though, In the stencil printer if you run into a problem like this, it will not work with the holes...Only what's in the stencil... We have under some rare circumstances used 1-2 pad's on opposite corners and on very large
Electronics Forum | Tue Dec 18 16:46:06 EST 2007 | wayne123
In addition to what frank said, I have also just placed the board on the work bench, but instead of trying to hold the board and stencil in place I would make a frame for the board using double sided tape, and after aligning I would tape the far edge
Electronics Forum | Fri Jan 18 14:38:07 EST 2008 | chef
Try asking your stencil supplier. One of mine recently gave me a sales pitch for something like you want. If you are mechanically adept and enjoyed Lincoln Logs, Erector Sets, Lego's, Panels and Girders toys then look at 8020.net. Extruded aluminum
Electronics Forum | Sat Jan 19 07:06:40 EST 2008 | jdumont
Check stanley supply and techni tool. They have rack with no doors but you could prob fab something up. 8020 stuff isnt cheap either. I bet it would cost about 400+ to build a stencil rack plus all the labor and thinking involved. That being said, I