On Monday 11 May 2015 07:23:47 Peter Homann wrote: > Hi Gene, > > The chemical is Galden 230, an inset liquid with a precise boiling > temperature with a very dense energy mist. It costs about $1000 per > litre. That's why you don't want the vapour to escape. :)
Eeeeyuueew, at that price, you don't want to smell it, period. > There is the Galden HT 230 version of the liquid that it 1/2 the > price. It's boiling temp has a 5deg variance whereas the Galden 230 > has a 1C variance. > > All you need is some very cheap equipment. An induction heater plus a > tall pot such as an asparagus cooker. > http://www.ebay.com.au/itm/Norpro-Asparagus-Stainless-Steel-Cooker-Ste >amer-/131463399197 > http://www.ebay.com.au/itm/5-Star-Chef-Electric-Induction-Cooktop-Port >able-Digital-Cooker-Single-Hot-Plate-/390928252222 > > If you search for DIY vapour phase you will find a lot of information. > > Have a look at this. > > http://www.eevblog.com/forum/projects/vapour-phase-soldering/msg657767 >/#msg657767 ATM the lathe is running, hopefully doing as I've told it, but I'd better go back & watch it. > > Cheers, > > Peter > > On 11/05/2015 6:35 PM, Gene Heskett wrote: > > On Sunday 10 May 2015 22:40:58 Peter wrote: > >> Surface mount is predominately done in relow ovens. There are not a > >> lot of throgh hole components that are designed for the reflow > >> process. Also appling the solder pate is problematic. There are > >> through hole connectors that are designed for reflow ovens. The > >> paste stencils have larger opening for the through hole parts so > >> that enough paste is applied. Also the hole size for the through > >> hole parts becomes more critical. I have done it on one of my > >> boards where I was using a DIP8 through hole socket. Works OK. > >> > >> The KISS machines are designed for through hole parts only. > >> > >> I had a chance to purchase a benchtop vapour phase solding machine > >> but wasn't quick enough. It's a very simple process. The machines > >> use a liquid (expensive) that boils at 235C. The process is to heat > >> the liquid to the boiling temp is a container until the vapour > >> fills the container. There is a cooling coil at the top of the > >> container that condenses the vapour if it rises too high as you > >> don't want it to escape. > > > > Might that be Safflower oil? It has a quite high flash point, and I > > have used it in a misting system while carving alu. It does extend > > tool life considerably by blocking the alu's acess to oxygen in the > > air, slowing the alox formation that eats even carbide tooling. > > Disadvantage of that was that I had no vapor removal system, and the > > 2 oz of oil used filled the building with such a fog that it took > > considerable cleaning to remove from my glasses. And I didn't want > > to think about what it might be doing to the efficiency of my lungs! > > > > Doing a board by lowering it into the hot vapor would rapidly bring > > the board to the vapor temp by the vapor condensing on the board, > > and would be pretty uniform. But I'd not hazard a guess as to the > > effects of the oil on the solder pastes predeposited. In blocking > > oxygen access as it condensed on the boards components it would > > enhance the activity of the rosins in the paste, potentially makeing > > a very good "gas tight" joint. But would the hot oil also degrade > > the resins in the solder paste. IDK. > > > >> The PCB is then lowered into the vapour. The PCB is then heated to > >> the vapour temperature. The advantage of this system is that unlike > >> infared reflow, larger components don't end up as a heat sink > >> causing uneaven temperatures across boards components. > >> > >> I know guys who have made vapour reflow maching with a 5 gallon > >> drum, PID heater along with a cooling coil wrapped around the top > >> of the drum. I've never tried it though. > > > > The amount of energy needed to achieve that vapor would indicate a > > need for some decent insulation around the bucket, but if the > > cooling coil did its job, and running water from the cold water > > faucet would do for that I'd think, you wouldn't need that much oil, > > half a cm in the bottom, so heating time to operating temps could be > > fairly short. Maybe a minute a board, you could have 100 boards > > ready to go and do them in under 2 hours one at a time. Several in > > a wire basket a bit smaller than the bucket would speed that up. 8 > > up maybe for a small board? > > > > Washing the oil back off the board would take some aromatics, > > alcohol for instance. That would also remove the rosins from the > > paste, leaving it very clean indeed. Food for an experiment? > > > >> Cheers, > >> Peter > >> Peter Homann > >> http://www.homanndesigns.com/store > > > > Cheers, Gene Heskett > > --- > This email has been checked for viruses by Avast antivirus software. > http://www.avast.com > > > ---------------------------------------------------------------------- >-------- One dashboard for servers and applications across > Physical-Virtual-Cloud Widest out-of-the-box monitoring support with > 50+ applications Performance metrics, stats and reports that give you > Actionable Insights Deep dive visibility with transaction tracing > using APM Insight. > http://ad.doubleclick.net/ddm/clk/290420510;117567292;y > _______________________________________________ > Emc-users mailing list > Emc-users@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/emc-users Cheers, Gene Heskett -- "There are four boxes to be used in defense of liberty: soap, ballot, jury, and ammo. 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