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 Post subject: Very unusual desoldering method...
PostPosted: Sun Dec 31, 2017 6:58 pm 
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Joined: Fri Feb 01, 2002 1:01 am
Posts: 1772
Location: Mideast USA
:grin: Hi fellows. Have to share this; worth trying.

Come back with your observations, results, comments, adaptations, improvements. Am sorry it has some advertisements embedded...
Get your finest tweezers ready, it is a very nice way to harvest valuable parts from discarded equipment, enjoy :

:idea: ----> https://www.youtube.com/watch?v=aGSFZ2eadaA

Am already thinking on doing it upside down... a rain of parts to start 2018 !



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 Post subject: Re: Very unusual desoldering method...
PostPosted: Mon Jan 01, 2018 3:20 pm 
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Joined: Thu Oct 26, 2006 7:11 pm
Posts: 1316
Location: Maryland
That sounds like an idea for single parts that's worth trying.
For whole board salvage, the best I've found is to hold the board, component side down, over an empty waste can. Heat the solder side with a heat gun, a small section at at a time. When the solder just starts to melt, tap the board briskly on the can's edge. Parts and solder will all go into the can, but, since the solder is just barely at it's melting point, it cools before it hits the can bottom so it does not stick on the parts. Now pick out the desired parts, including those pesky pin headers that often come out intact, and is hard to do any other way.
It can be a bit messy, so you better consider using eye protection and of course there's always a burn risk...As we all know!



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 Post subject: Re: Very unusual desoldering method...
PostPosted: Tue Jan 02, 2018 9:51 am 
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Joined: Fri Feb 08, 2002 1:01 am
Posts: 4284
Location: USA / North Carolina / Fayetteville
i saw this the other day also, but i hope that lamp does not get too hot to hold.
if anyone tries it let me know, curious if it actually works.


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 Post subject: Re: Very unusual desoldering method...
PostPosted: Tue Jan 02, 2018 12:41 pm 
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Joined: Thu Aug 01, 2002 12:01 am
Posts: 2822
Location: San Jose CA
Seems like it would blind the operator somewhat when used as a wand. Practically like Welding, you would need glasses so dark, all you would see is the bulb and immediate work area. Its not surprising considering Halogen lamps are often well over 100W. A better application would be to power it using a PWM supply with thermocouple feedback and use it for back of the board heating in a rework situation. When not soldering, can be used to make little cakes or shrink tubing.


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 Post subject: Re: Very unusual desoldering method...
PostPosted: Tue Jan 02, 2018 12:52 pm 
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Location: Mideast USA
A piece of sheet metal as half shroud should take care of the glare for the user. Headlamps were limited by law to 55 Watts, but that was a looong ago.



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 Post subject: Re: Very unusual desoldering method...
PostPosted: Tue Jan 02, 2018 4:35 pm 
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Location: San Jose CA
I didn't think that was a headlamp, just a low voltage lamp for indoor use, I scrapped some 75 and 150W potlights for LED a few years ago. 55W would be obsolete since many new cars have LED lamps rated in Lumens and you can get some pretty bright ones now on ebay but I couldn't say if they are non compliant though.


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 Post subject: Re: Very unusual desoldering method...
PostPosted: Wed Jan 03, 2018 8:01 am 
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Joined: Fri Feb 01, 2002 1:01 am
Posts: 1772
Location: Mideast USA
Hi haklesup.
The lamp bulb used on the video is a common automotive halogen 12V incandescent headlamp bulb, typically 55 to 65 Watts. One filament has a Graves shield to direct the emission towards one side (or block certain direction).
There is also 120VAC halogen bulbs (without the shield) that could also be used.
Hyperbright LED automotive headlamps would not emit infrared to melt solder.
Will see what is in my bins to try :smile:

----> https://images-na.ssl-images-amazon.com ... L1024_.jpg



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 Post subject: Re: Very unusual desoldering method...
PostPosted: Thu Feb 01, 2018 7:40 am 
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Location: NY
Maybe add a glass lens and fry small critters like ants!
Or, contactless wood burning!


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 Post subject: Re: Very unusual desoldering method...
PostPosted: Sat Feb 03, 2018 10:03 pm 
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Joined: Fri Jan 11, 2002 1:01 am
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Location: NewJersey
Hi,

I get Godzilla to breath on the bottom of my boards and all the parts fly right off :smile:

It's not what you know it's who you know.

Or in this case, it's not what you know it's WHAT you know :grin: :grin:



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 Post subject: Re: Very unusual desoldering method...
PostPosted: Sat Feb 24, 2018 11:16 am 

Joined: Wed Sep 17, 2003 12:01 am
Posts: 19
I tried it and it does work. Here is a few suggestion. Use sunglasses, a heat shield on the back end of the bulb, make or purchase a ceramic lamp holder for the bulb and use welding gloves.
I used 120v halogen lamp. (It is not my preferred method to do it this way) :yuck:


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