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| Electronics workbench talk (was "Hakko 888D") |
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| BadMouth:
--- Quote from: pbj on August 26, 2015, 12:36:10 pm ---Yeah, he's got the air flowing in the wrong direction, though. Unless I'm misunderstanding the purpose of his coil in the shaft. --- End quote --- The purpose of that contraption is to blow hot air on the tabs of tiny surface mount parts. The parts are attached via solder paste first, then heated up with air to get the paste to flow. Air is used because the parts are just too damn small to get a solder covered iron in there without bridging tabs. I've seen it done with the bulb type ones. The bulb keeps the tubing from getting too hot. |
| MonMotha:
Personally, I've always found drag soldering easier than hot air for hand assembly of fine-pitch SMDs. I can do a 144 lead 0.5mm QFP in about 3 minutes. Most of that time is board prep (cleaning, fluxing, etc.) and positioning of the part. You also don't need a paste stencil for this which is handy. Touching up cold joints from automated assembly with hot air can be useful, though ideally you'll eventually get your process tuned to where it's largely unnecessary. For removal, yes hot air is handy, or I'll just cut the leads off with an X-acto if I don't care about the part and don't want to risk cooking other stuff on the board badly. However, most of those little SMD rework stations with hot air just don't have enough volume to remove a part since you have to bring the whole thing up to reflow at the same time. I just use a heat gun. I have also seen nifty little workstations with bulk pre-heat air, typically applied to the bottom of the board, and then a handheld wand to bring it up the final 50-100 degrees. Those apparently work quite well. |
| harveybirdman:
Anybody want to talk me out of buying a Chinese knock off of the Hakko? Yihua has some decent reviews at a quarter of the price. |
| BadMouth:
--- Quote from: harveybirdman on October 09, 2015, 09:41:18 am ---Anybody want to talk me out of buying a Chinese knock off of the Hakko? Yihua has some decent reviews at a quarter of the price. --- End quote --- No experience with it, but Harbor Freight used to sell an assumed knock-off that turned out to actually be made by Hakko. It was pretty much just a rebranded Hakko. Same tips, same performance. After people caught on, they stopped selling it. This is before the rounded blue design and before I was into this stuff. I read it on the interwebs, so it must be true. |
| vwalbridge:
--- Quote from: harveybirdman on October 09, 2015, 09:41:18 am ---Yihua has some decent reviews at a quarter of the price. --- End quote --- What model are you looking at specifically? I looked up "Yihua" on Amazon and they make dozens of kits. |
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