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Author Topic: Reflow / rework  (Read 2730 times)

bethjaneway

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Reflow / rework
« on: April 08, 2013, 04:19:58 PM »
FYI this is the rework station Mike Spitz recomended I try.

It has a ceramic preheat plate to warm the board, and an infrared lamp to finish melting specific areas. Seemed to work well. The main issues I've had, melting nearby plastic components, and making multiple components stay in place at once.

Should I wear sunglasses when working with this?

I've found solderpaste challenging, maybe I'm not doing it right. I use it to stick several parts on, and they slide off when it finally gets hot enough. Or there's not enough and it doesn't make a good connection. So I usually hand-solder them on, using the hotplate to speed the process a little.

Any suggestions on solderpaste usage?

Also here's my soldapult which I liked a little better than the one on the lab bench.
I haven't tried the toaster oven approach since I'm usually working on one component at a time. 
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willasaywhat

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Re: Reflow / rework
« Reply #1 on: April 09, 2013, 11:22:19 AM »
I have no professional experience, but when I used the kitchen hot plate at the lab for reflow what I did was apply flux from a flux pen, apply the solder paste with a toothpick or stencil/squeegee, and then plop the component on top making sure to press it into the solder paste. Then I heat it to 450, and the surface tension pulls everything together.

Sugar

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Re: Reflow / rework
« Reply #2 on: April 10, 2013, 02:47:18 PM »
Ex-IPC-610c and 7721 rework certified person here.

We used to use solder tape to hold stuff in place, its like masking tape but super high temperature. It's used primarily for solder fountains but we used it to hold components in place on the top side, gravity willing of course.

bethjaneway

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Re: Reflow / rework
« Reply #3 on: April 16, 2013, 03:29:23 PM »
Here is the 'new' oven for reflow. Turn on with pliers.
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bethjaneway

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Re: Reflow / rework
« Reply #4 on: April 16, 2013, 04:05:08 PM »
Ok, there are some ideas. I'll try using more flux, and solder tape. Thanks!
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Swinden Von Fappergiest

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Re: Reflow / rework
« Reply #5 on: April 16, 2013, 07:00:30 PM »
Turn on with pliers.


I like tools with instructions like this

P47

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Re: Reflow / rework
« Reply #6 on: April 17, 2013, 10:36:56 AM »
Didn't know where to post this, so I'm putting it here.


I found a small box for your mill you left at the lab. When I opened it I found the drawbar we were talking about.
I put it in the lateral file cabinet in the classroom.


P47

bethjaneway

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Re: Reflow / rework
« Reply #7 on: April 18, 2013, 01:25:07 PM »
Thanks, I actually have a locker, could it go there? Locker labeled Gadgetcat and unlocked. Also if you need some test material for the Haas there's scrap in that locker. 
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RubiconCube

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Re: Reflow / rework
« Reply #8 on: March 30, 2014, 03:27:37 PM »
I don't know if you guys ever worked this out or not, but I have a Jovy RE-8500

Edit: I didn't finish this (whoops)

It's ridiculously easy to use. I've only used glasses for UV light. The board and target temps are monitored by probes and it has a USB interface for a GUI. I'm actually trying to get rid of it. It's not MINE, though, it's the company's. I'll see if I can donate it for a tax deduction or something? I can't make any promises, though. My attempts to ebay it have been in vain. I've had it on auto-relist for a while. It looks like it relisted today and has 7 days left, so if someone buys it I wouldn't be able to donate it.

http://www.ebay.com/itm/Jovy-RE-8500-INFRARED-BGA-REWORK-STATION-COMPLETE-WITH-XBOX-PS3-PCB-FRAMES-/161258070098
« Last Edit: March 30, 2014, 03:53:19 PM by RubiconCube »

RubiconCube

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Re: Reflow / rework
« Reply #9 on: March 30, 2014, 03:38:28 PM »
Ex-IPC-610c and 7721 rework certified person here.

We used to use solder tape to hold stuff in place, its like masking tape but super high temperature. It's used primarily for solder fountains but we used it to hold components in place on the top side, gravity willing of course.

I use multiple layers of kapton tape. I've never used the masking tape. Any differences?

ki4swy

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Re: Reflow / rework
« Reply #10 on: March 31, 2014, 06:36:06 AM »
i would love to have the Jovy RE-8500, but the price just is too rich for the amount of smd work i do, as my hakko setup and quickchip work just fine.
"Good engineers keep thick authoritative books on their shelf. Not for their own reference, but to throw at people who ask stupid questions. Hoping a small fragment of knowledge will osmotically transfer with each cranial impact." - eeguru

If it runs on electricity, i have it :)

RubiconCube

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Re: Reflow / rework
« Reply #11 on: March 31, 2014, 09:54:31 AM »
Well hopefully I can donate it. The company bought it for a couple thousand 2 years ago to reflow & reball xboxes and ps3s. I don't know what I'm doing, and I can use it without ever popcorning or melting things. The number of people in need of a reballed GPU these days are few and far between. If they'll take something like $400 for it, I'll buy it and keep it in the space. That is, if they don't want to donate it for a $2000 writeoff.

The plan was to sell it to pay for new equipment, but I just bought the new equipment and nobody wants the rework machine. So, fingers crossed

ki4swy

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Re: Reflow / rework
« Reply #12 on: March 31, 2014, 01:59:33 PM »
well, i would never use it over there :( its a 2hr hike for me )



"Good engineers keep thick authoritative books on their shelf. Not for their own reference, but to throw at people who ask stupid questions. Hoping a small fragment of knowledge will osmotically transfer with each cranial impact." - eeguru

If it runs on electricity, i have it :)

willasaywhat

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Re: Reflow / rework
« Reply #13 on: March 31, 2014, 02:00:57 PM »
Pfft, get off my lawn Tampans! ;)