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December 4, 2010
Tutorial - Solder Paste Stenciling
about 5 years ago
or a board with 16 parts per board we make average 6000 per shift 8 hours.
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.
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.
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?
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 />
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 />
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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