| Electronics > Projects, Designs, and Technical Stuff |
| DIY Vapour Phase Frying Pan Project |
| << < (7/10) > >> |
| mikeselectricstuff:
--- Quote from: trevwhite on June 30, 2019, 08:10:45 pm --- --- 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 --- End quote --- For reworking Ali boards, it heats up quick enough that time isn't a big issue. Probably a little slow for reflow (800W heater) but would probably work if you pre-heated it before putting the board on. if you wanted to do it a lot, I'd maybe look at adding an insulating lid to reduce heat loss |
| mrpackethead:
I have attached some intial code, that demonstrates how we can read the reflow profile from the json file, interpolate it, and create the set point. Adding pid and temp read to this wont' take much longer, and i will change the timing so it does not use delay. rather actual system times, as reading the temp, and seeting the new PID will take time. The code is python3; Useage python vpfry.py profile |
| mrpackethead:
THis is the box i'm going to use to mount everything in. Since its got AC power this is something that you dont just tag together on the bench to test.. I will get a combo 20A Circuit breaker/RCD for it as well. I need to put an AC fan in the box i think. All the bits ( including the control PCB ) will be able to be mounted on teh DIN rail. The heatsinks for the SSRS' have a profile that lets you slide them onto the din rail, they are a bit of a loose fit though, so i'll have to do somethign to secure them down. Going to connectorise everything so its easy to swap things around. Adds to teh cost, but as this is a prototype it makes it a LOT more flexible. |
| mrpackethead:
Mm. so if you dont' have an reflow system, then how to do you reflow the board that you need for the controller? Ran out of time to do this one today. Maybe tommorrow. |
| mrpackethead:
Assembled three pcbs, and yes, these where reflowed with vapour. Couple of wee issues, but nothing thats a big deal.. I had the wrong USB connectors, so had to panelbeat a coupel of connectors to fit. :-) The USB bit stands up, and i can talk to the chip. will have to read the datasheets now to reach teh other devices. |
| Navigation |
| Message Index |
| Next page |
| Previous page |