I used to do SMT If the solder paste does not absorb moisture when stored it should be OK
People have had success with an iron frying pan on the stove . I have used a hot air paint stripper gun with a metal funnel to re flow the paste. There cheap SMT re work stations on Alibaba now <$100 On Thu, Jan 25, 2018 at 5:10 PM, Mark Sims <hol...@hotmail.com> wrote: > OSHSTENCILS.COM sells stencils by the square inch. They have 4 mil > stainless, 3 mil Kapton, and 5 mil Kapton... I usually use the stainless > ones. They also sell syringes of solder paste. I keep mine in the > fridge. I have year old paste that works fine. There are now pastes > that do not require refrigeration... I don't know how good they are. > > QFN44 pads are spaced 0.5mm. You don't have to get the chip set down > perfectly. Surface tension will align it when the solder melts. I've > hand placed chip scale packages with like .25mm pads. > > I use a modified toaster oven. My temperature control PID is derived > from Lady Heather's temperature control algorithm. There are a LOT of > Arduino, etc reflow oven controllers out there. > > --------------------- > > > Can anybody comment on the toaster oven approach? > > Is it practical for things like this? How much does a solder mask cost? > How > much other stuff do I need? Does the solder paste need to be refrigerated > and other quirks like that? > > What are the chances of a newbie getting a 44-QFN right on the first try? > _______________________________________________ > time-nuts mailing list -- time-nuts@febo.com > To unsubscribe, go to https://www.febo.com/cgi-bin/ > mailman/listinfo/time-nuts > and follow the instructions there. > _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.