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Surface Mount Oven

:: EPE Chat Zone ­:: ­Radio Bygones Message Board :: » EPE Forum Archives 2010 - » Archive through 27 January, 2010 » Surface Mount Oven « Previous Next »

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mel
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Username: mel

Post Number: 82
Registered: 05-2005

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Posted on Wednesday, 06 January, 2010 - 05:18 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Hi All
Has anybody built there own? eg: table top oven. Or do you use other methods?
Mel
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joe
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Username: joe

Post Number: 706
Registered: 05-2005

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Posted on Wednesday, 06 January, 2010 - 06:24 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Mel,

Got a new/graded electric one off Ebay for £20 including postage. Only a small wee beast but seems to do the job ok the couple of times I've tried it.

Joe
Read my ramblings - www.techbites.com/joe-farr
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mikeb
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Post Number: 231
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Posted on Friday, 08 January, 2010 - 01:05 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

I am playing around with an old iron (laundry). It melts solder ok.

rgds

mb
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johnmosborneuk
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Post Number: 15
Registered: 06-2009

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Posted on Friday, 08 January, 2010 - 08:33 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

I have been considering a similar project myself after I noticed that sparkfun sell a PIC based controller for the job :-)
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terrym
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Username: terrym

Post Number: 692
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Posted on Saturday, 09 January, 2010 - 01:37 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

I've got one in the works (on hold at the moment - have recently moved house).

I'm using a small fan forced toaster oven and a PIC based controller.

TM
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alec_t
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Post Number: 138
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Posted on Saturday, 16 January, 2010 - 04:02 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

@terrym
Do you toast both sides of your pcb?

Alec
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terrym
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Post Number: 695
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Posted on Sunday, 17 January, 2010 - 02:21 am:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

Alec, there are elements top and bottom of the oven. Also a fan for circulating the heat.

Working on the mechanics of using the fan assembly to let cool air in at the end of the cycle instead of opening the door.

The controller is from Sparkfun (16f88).

Waiting on new workshop to be built, so will be 2 - 3 months before I can get back to it (it's a big w/shop, 15m x 7.5m with mezzanine).

TM
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microguy
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Username: microguy

Post Number: 10
Registered: 01-2010

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Posted on Sunday, 17 January, 2010 - 07:29 pm:   Edit Post Delete Post Print Post    Move Post (Moderator/Admin Only)

I've always used just a regular soldering iron for soldering SM stuff. Dot of solder on one of the pads, pick up the part with tweezers, apply one connection of part to pad at the same time I apply soldering iron, then just solder the other connections.

A chip is a bit different. I solder opposite corners of the chip, soldering and reheating the first two pads until the chip is properly in place, then just solder the rest.

But... That was when my eyes were better. Haven't done much lately. But a oven does sound like a good idea.

I think the key to getting those to work, is pre-heating the whole thing. You pre-heat the board/components with "something", then pop it in a already hot oven.

I think if you use an oven, and don't pre-heat it, it may take a bit too long to come up to temp.

I don't think it's critical, temperature wise. Just get it good and hot, hot to the touch, but not so hot that anything melts, solder included. That way the heat "soaks into" all the parts.

Then, when you put it in the hot oven, it's exposed to the high temps, that could do damage, for a much lesser time.

You could use a heat gun, or maybe even another oven set to a lower temp. Then just pull it out of one, and put it in the other.

Personally, I think I'd probably have a harder time using a syringe to put the dots of solder on everything. If you're doing that, might as well use a regular iron.

Just my thoughts on it.

I'd prefer to use use SM when possible. I just like smaller parts, smaller PCB's etc... Sometimes that preference for SM can be a bother when creating the PCB's because of limited trace routing. But, I don't mind doing double sided PCB's either, so, generally that's not an issue either so much.

But I don't think I'd want to use my regular table top oven for soldering PCB's. Definitely a dedicated unit.


You can get these (if you're willing to spend a few bucks) with fans in them. It's just a regular convection oven. I just got one for Christmas. Cooks much faster, built in fan, elements top/bottom, light, great digital controller.

The brand name is Euro-Pro. No idea how much it cost.

It's not a "toaster oven", it's a table top oven. I hardly ever use my regular oven, except for the occasional large pizza.

I think a good place to look for these besides wally-mart type stores (cheap ones, but not too bad) is RV places. I think ya'll call 'em "Caravan", like caravanning. They're great for campers, caravans, trailers etc.... Smaller, lower power, etc...

Just sayin'....

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