| Electronics > Projects, Designs, and Technical Stuff |
| Vapour phase Soldering |
| << < (24/48) > >> |
| jeremy:
--- Quote from: helius on January 26, 2015, 09:02:17 pm ---I think you are focused too much on the cost of the fluid. it could cost 10 times as much and it would still be less than the cost of engineering a proper heat loop, cooling system, mechanical elevator, vapor detector, control system, user interface, and chassis. --- End quote --- I disagree. This is on my own time, so time isn't worth all that much ;) and I think I already have most of the physical bits already (including linear bearings, motor drivers, chains, many devkits I can use as the controller, thermocouples, induction heating plates). So the major outlay for me will be the fluid, especially given that I'll probably mess up and lose some. This isn't a 24/7 machine, it just has to work while I'm looking after it. Even the 3M system which they used to solder expensive Intel CPUs is just a dumb heater, plus some water flowing around a big test tube. Plus, I think it would be more applicable to others using the cheaper fluid. |
| helius:
Well, don't let me be the bearer of bad news :-X One last video as cautionary tale: Notice how vapor is pouring out of their setup. This means that the heat input is in excess of what is required for the small board they are reflowing. It causes tombstoning, and look at that BGA |O this is what VPR was like in the 60s when it was abandoned. |
| Kjelt:
--- Quote from: helius on January 26, 2015, 10:01:03 pm ---Notice how vapor is pouring out of their setup. This means that the heat input is in excess of what is required for the small board they are reflowing. It causes tombstoning, and look at that BGA |O this is what VPR was like in the 60s when it was abandoned. --- End quote --- If i saw the presentation on the previous page they measure the temp on three vertikal places and lower the board when there is no vapour yet (so the Galden temp is around 200) than apply the extra heat and control it so the temp is following the reflow profile. That is how i intertreted it. The video you showed is amateur time no smooth operating elevation, no temperature control what I can see and they are boiling the Galden even way before the pcb is lowered. And even worse no lid to contain the vapour to let it come in contact with the coolong area and liquidize back. |
| mrpackethead:
--- Quote from: Kjelt on January 26, 2015, 10:30:54 pm --- --- Quote from: helius on January 26, 2015, 10:01:03 pm ---Notice how vapor is pouring out of their setup. This means that the heat input is in excess of what is required for the small board they are reflowing. It causes tombstoning, and look at that BGA |O this is what VPR was like in the 60s when it was abandoned. --- End quote --- If i saw the presentation on the previous page they measure the temp on three vertikal places and lower the board when there is no vapour yet (so the Galden temp is around 200) than apply the extra heat and control it so the temp is following the reflow profile. That is how i intertreted it. The video you showed is amateur time no smooth operating elevation, no temperature control what I can see and they are boiling the Galden even way before the pcb is lowered. And even worse no lid to contain the vapour to let it come in contact with the coolong area and liquidize back. --- End quote --- And if you find the long version of the Video,you'll find that they actually poured water into the tank. ( why we don't know, but these were engineering students, anything is possible when you know everything ). Galden vapour is transparent, you can't see it, so that vapour is probably boring old H2O. |
| mrpackethead:
Some more data, that i was able to obtain tells me that; The Distillation spec range of the HT230. 10% > 210C, 90% < 250 Compared to the LS which is 10% < 222, 90% < 235 The viscosity of the HT is between 3 and 7, and for the LS its 5-6 cSt. The base material of the two products is the same thing, its how it is processed. I am in a very interesting discusion with a supplier who can further distill the HT230,, and bring the spec very close to that of the LS-230. 7kg of this 'tweaked' product, will be around $1000 for 7kg, which compares favourably to a the $1400 or so for 5kg of LS-230. I'm now very tempted to proceed on this. |
| Navigation |
| Message Index |
| Next page |
| Previous page |