| Electronics > Projects, Designs, and Technical Stuff |
| DIY Vapour Phase Frying Pan Project |
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| mrpackethead:
I've never tryed this, but it is an interesting idea. Vapour phase removal of a BGA. The lifting arm has a special high temp adhesive tape, that you use to stick it to the bga. Into the oven, and when its hot enough the spring will lift it up. Of course everthing else gets molten.. but.. non the less its one way to doing it. |
| mikeselectricstuff:
--- Quote from: trevwhite on June 29, 2019, 09:06:37 pm ---Reworking aluminium PCBs sounds like a nightmare! Quote from: mikeselectricstuff on Today at 07:53:07 pm I have one of those - they are awesome for reworking aluminium PCBs. --- End quote --- --- End quote --- With a hotplate it's a piece of cake - place the PCB on the plate, then push it down with a probe where you want to rework, to improve thermal contact - then just pick off the old part, and drop on a (pre-fluxed) replacement. If I was doing it a lot I'd make a rig with a hand-rest, but for thinks like replacing LEDs or popping mis-placed ones into place it's really quick & easy |
| Kean:
--- Quote from: mikeselectricstuff on June 30, 2019, 11:24:41 am ---With a hotplate it's a piece of cake - place the PCB on the plate, then push it down with a probe where you want to rework, to improve thermal contact - then just pick off the old part, and drop on a (pre-fluxed) replacement. If I was doing it a lot I'd make a rig with a hand-rest, but for thinks like replacing LEDs or popping mis-placed ones into place it's really quick & easy --- End quote --- I bought a 946D with the same thing in mind, so glad to hear it works for you. I think the 946D is basically the same as the C model, but also comes with clamps for doing phone screen repairs. I also have a KADA 853A IR unit which I use for pre-heating for through hole rework & part salvage. |
| trevwhite:
--- Quote from: mikeselectricstuff on June 30, 2019, 11:24:41 am ---Quote from: trevwhite on Yesterday at 08:06:37 pm Reworking aluminium PCBs sounds like a nightmare! Quote from: mikeselectricstuff on Today at 07:53:07 pm I have one of those - they are awesome for reworking aluminium PCBs. --- End quote --- #smlt#/blockquote> --- End quote --- With a hotplate it's a piece of cake - place the PCB on the plate, then push it down with a probe where you want to rework, to improve thermal contact - then just pick off the old part, and drop on a (pre-fluxed) replacement. If I was doing it a lot I'd make a rig with a hand-rest, but for thinks like replacing LEDs or popping mis-placed ones into place it's really quick #smamp# easy --- End quote --- I take it you have to watch the clock when doing this. You cant have the components hot for too long else damage will be caused? How long does it take to heat up the board? Can it actually be used for reflow or is it too slow? Trev |
| mrpackethead:
I spent a bit of time today, working out how i will describe the Reflow curve. I've decided i'll represent it in JSON. This makes it very easy to tweak and change, and add additional curve points if required, without adjusting the main code. Everything shoudl be pretty straight forward to undersand. Looprate is in Hz.. This means we'll read the temp, and adjust the the PID settings 10times a second. We'll interpolate the values between the stated points. { "name": "SAC305_LS230", "description": "Reflow profile for Frying Pan" "looprate": 10, "heating_max_duty_cycle": 100, "cooling_min_ontime": 1 "profile": { "p1": { "time": 120, "temp": 150 } "p2": { "time": 180, "temp": 160 } "p3": { "time": 220, "temp": 230 } "p4": { "time": 260, "temp": 230 } "p5": { "time": 240, "temp": 200, } "p5": { "time": 300, "temp": 80 } "p6": { "time": 360, "temp": 40 } } } |
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