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. :)
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-Steamer-/131463399197 http://www.ebay.com.au/itm/5-Star-Chef-Electric-Induction-Cooktop-Portable-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 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
