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'[EE]: hobby SMT parts removal...'
2001\07\27@064056 by Roman Black

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> > For larger ICs, flood and lift will work, if done carefully.
> > I've done 100 pin ICs that way, though it would have been easier
> > to cut the
> > leads (with a knife, cutters will rip up the pads)
>
>         A real easy way to get SMT stuff off a board is a heat gun. The only
> problem is when you use it you have to make sure you don't bump the board
> causes things you DON'T want removed to shift. I've gotten almost anything I
> wanted (both through hole and SMT) with my heat gun. TTYL


I thought you might like to hear about this,
i've been playing with a new method of removing
SMT parts or through-hole PICs from double sided
boards, I removed about 50 PICs the other night
from double sided PTH type boards in less than
5 seconds each, worked like a dream! :o)

I have a small solder "cauldron" which is a little
metal pot about 2" across and 1.5" deep, with an
integral element and handle. They are sold as tools
for dong wire tinning during manufacture, you dip
the wires in the molten solder in the pot. I got it
as part of a junk lot, I don't know how much they
cost.

I noticed that if you over-fill it, the molten solder
sticks up about 3mm!! The solder surface tension is
huge and makes a convex meniscus, almost like a bubble
of liquid solder sticking out of the pot. Having seen
"wave" soldering done, I instantly thought of the
possibilities of this...

Anyway it worked perfect to remove 50 PIC chips in a
few minutes, I just layed the boards on top of the
solder bubble for 2 seconds, and pulled the chips
straight out.

Now I just need to try some SMT stuff and maybe wave
soldering with it...
;o)
-Roman

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2001\07\27@072426 by steve

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> I have a small solder "cauldron"

> I just layed the boards on top of the
> solder bubble for 2 seconds, and pulled the chips
> straight out.

A scaled up version of this is used by a lot of small/medium
manufacturers around here. Many of them have wave solder
machines that sit idle because the setup time and having carriers
made isn't justified for batches of many different products.

There are specific fluxes for this type of soldering and a typical
setup looks very much like the vats in a greasy fast food outlet.
One for flux (which also preheats) and one for the solder.
A couple of deep friers from the local store and you have your
through-hole production setup as well.

> Now I just need to try some SMT stuff and maybe wave
> soldering with it...

If you are going to dunk your SMT parts in the solder bath, you
might want to consider baking the boards in the toaster oven for a
while to drive out moisture first.

You mentioned small boards in the toaster oven in another
response. I'm doing 8" x 5" panels (leaves about an inch on each
side) with no problems. Although I'm using fan-forced for preheat
and grill for reflow which may make a difference.

Steve.

======================================================
Steve Baldwin                Electronic Product Design
TLA Microsystems Ltd         Microcontroller Specialists
PO Box 15-680, New Lynn      http://www.tla.co.nz
Auckland, New Zealand        ph  +64 9 820-2221
email: spam_OUTstevebTakeThisOuTspamtla.co.nz      fax +64 9 820-1929
======================================================

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2001\07\27@093115 by Lawrence Lile

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Solder pots can also be made out of an old electric cooking pan, the 6" size
works well.  You have to hack the thermostat, or replace it with a temp
controller, to get the proper temperature.  Similar to SMT Toaster oven.

--Lawrence

{Original Message removed}

2001\07\30@071142 by Alexandre Domingos F. Souza

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>I have a small solder "cauldron" which is a little
>metal pot about 2" across and 1.5" deep, with an
>integral element and handle. They are sold as tools
>for dong wire tinning during manufacture, you dip
>the wires in the molten solder in the pot. I got it
>as part of a junk lot, I don't know how much they
>cost.

       We use this here in my work to dismantle old arcade boards (buááá, only the boring types like Power Instinct and like hehehe), we have made an special "tool" that grabs securely the IC being removed. Just put the board on top of the "cauldron" and pull the IC. A brand new IC you have ;o)


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Alexandre Souza
.....taitoKILLspamspam@spam@terra.com.br
http://planeta.terra.com.br/lazer/pinball/

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