makbert

Member Since: December 4, 2010

Country: United States

  • Tutorial - Solder Paste Stenciling | about 3 years ago

    or a board with 16 parts per board we make average 6000 per shift 8 hours.

  • Tutorial - Solder Paste Stenciling | about 3 years ago

    bootstrap:<br />
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    Applying solder paste with a stencil seems messy, and seems to have substantial time overheads for setup, redo when needed, cleaning stencils, cleaning poisons from the work area, cleaning hands, arms, and clothes… etc.
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    Can someone who has ALSO applied solder paste manually with a “plunger type dispenser” or a “pressure-driven dispenser” [with foot-pedal] please compare the time and effort required? Also, please compare the likelihood of opens and shorts with these two methods.
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    Also, I was looking at pick-and-place machines and noticed they are all quite fast at applying solder paste dots all over a PCB (10,000+ dots per hour for even slow-poke machines). This makes sense because the head only needs to move 1mm or so to apply the next dot, rather than 1 meter or so to pick up the next component and return to the location on the PCB. So my other question is — if you have a pick-and-place machine, why in the world would you not that machine apply your solder paste?
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    you would have change the whole system which takes longer than a dedicated printer. Im guessing the printer lasts longer or needs less maintenance. I work with pick and place machines and a stencil printer. I could just imagine the problems with a pick and place doing the paste. If you own a pick and place you might as well own a paste printer and a conveyor oven otherwise you don’t need pick and place. we do boards with 50,000+ connections and printer takes 15 seconds.<br />
    http://www.digitalmedia-world.com/images/stories/April/NAB2/AJA-KONA-3.jpg<br />
    We make those boards at 10 per hour but if parts are all stocked with parts you do 18 an hour, but you have to replenish parts a lot.<br />
    http://www.youtube.com/watch?v=cKJ34ATlvK4<br />
    that might get you an idea of it. when the 2nd machine goes slower its picking up the bigger components like the expensive bgas. if we had emerald x-ii like that we’d get 22 boards an hour probably at max

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