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Thread: A walk through the CWT factory

  1. #11
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    Quote Originally Posted by ridgid13579 View Post
    Nice!

    All the surface mount components are put on by pick and place machines right?
    Yes. I didn't take pictures because the pick and place is in a clean room and they had me in a (way too small) jacket and shoe covers and I didn't feel too comfortable.

    Quote Originally Posted by ridgid13579 View Post
    Where could I get a 12v to 5v dc-dc converter like the one in PSUs. Mind sending me one?

    7805 isn't cutting it anymore :P
    You could buy a CX450M and tear out the DC to DC board!

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    There are shitloads of DC-DC converters on fleebay, ali, everywhere for just a few bucks…the CX is still not THAT much cheap

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    Quote Originally Posted by Behemot View Post
    There are shitloads of DC-DC converters on fleebay, ali, everywhere for just a few bucks…the CX is still not THAT much cheap
    The ones off eBay are scary.

    I've had one randomly jump to input voltage on start.

    Plus most are limited to ~5 amps or less

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    There are even better ones, just mroe expensive.

    I know suppliers of quality japanese stuff, but are you ready to pay for that? That's the thing where most people fail…

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    Originally Posted by JonnyGURU
    In this shot, off to the left, you can see the line of people placing components on the PCB.
    Originally Posted by JonnyGURU
    After going through the wave soldering, the unit is flipped upside down and put in another jig where it is "cleaned" by hand
    These 2 cases that were described by Jonny, shouldn't / couldn't have been automated and not hand-made?
    I would feel much safer if they were.

    P.S.: Excellent photo archive!! Never seen what's inside a PSU factory
    CPU:Athlon 64 FX60 (2-cores) 2,6GHz
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    cpu cooler:ArcticFreezer13 CO
    RAM:4 GB DDR 400MHz
    GPU:Asus 750 Ti 2GB
    PSU:Seasonic Platinum 660
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    Quote Originally Posted by sith'ari View Post
    These 2 cases that were described by Jonny, shouldn't / couldn't have been automated and not hand-made?
    I would feel much safer if they were.
    Umm... No.

    So the jig finds the obstructions that aren't found by eye. That's a semi-automated process. Then the person trims the leads.

    You've seen the underside of a PSU, right? At least a higher end unit like the RM? There's a lot under there. Not sure how you'd automate that. And no two different models are 100% the same, so it would be very resource consuming to program some sort robot, etc. to clean up that underside.

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    Did you have a chat with any of the assembly line/qc line workers, or just the people who were assisting you on the trip?

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    I don't speak Mandarin well.

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    Quote Originally Posted by jonnyGURU View Post
    Umm... No.

    So the jig finds the obstructions that aren't found by eye. That's a semi-automated process. Then the person trims the leads.

    You've seen the underside of a PSU, right? At least a higher end unit like the RM? There's a lot under there. Not sure how you'd automate that. And no two different models are 100% the same, so it would be very resource consuming to program some sort robot, etc. to clean up that underside.
    Well, you could pre-cut the leads of the components to the desired length but I suspect it would slow down the workers (I think it would take more time to insert components) and some components may shake out during wave soldering (longer leads could keep them in place for just enough time)

    Or another solution, get a laser cutter, put the power supply on a side, program the laser cutter to cut this many mm from the pcb (so that chips would be safe),spray the bottom with some black paint or something and now use the laser to cut the leads in one fast motion. Now clean the paint off the board's bottom.
    It would be expensive and there's also the issue of all the waste produced (the paint and the solvents to clean the pcb bottom etc)

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    No. A component that's mounted on the underside of the PCB is, and should, stick out a bit further than where you'd want excess component legs.

    And it's best to have the components have "too long" legs going into the wave soldering machine in case the component moves between point a and point b.

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