Mark Cason wrote: > > > a few years ago, i saw a prototyping machine, that used a syringe, to > deposit solder directly onto a SMD pad. It basically touched down on a > pad, and then deposited a tiny amount of solder, while retracting. > then, it rewound the syringe's stepper, a couple steps, to keep solder > from dripping. It was slow, but it worked. The company folded, and I > never could find out what happened to that machine. I know that it > worked on 0805, and SOT packaging, whether it worked on anything finer, > I never saw. > Yes, air over syringe pistons and a kind of dual screw pump are used for solder paste dispensing in production machines. There must be 50 companies making these machines, either stand alone or as add-ons to pick and place machines. I think Manncorp and Madell might be some of the US makers or distributors.
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