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'[OT]:Air-soldering was: surface mount question...'
2001\03\01@145350 by jamesnewton

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source= http://www.piclist.com/postbot.asp?id=piclist\2001\03\01\094404a

Robert Severson said:
"So: Can anyone think of a way to build an inexpensive air pencil? The
question of surface mount soldering for the hobbyist has surfaced  often. (I
know someone will mention toaster oven.)"

"How would you make a hot hollow tube? I think a fish tank air pump could
provide air-flow."

Has anyone tried wrapping a fine copper tube around a high power soldering
iron? Hose clamps to hold it on. Lots of coils equals good heat transfer.
Where can you find high temp plastic tube to connect the copper coil to the
fish pump?

Pictures of a working setup with construction details will get you a banner
at the bottom of every piclist.com page for a month....

...and it would be a neat hack.

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2001\03\01@155512 by David VanHorn

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>
>Pictures of a working setup with construction details will get you a banner
>at the bottom of every piclist.com page for a month....

Grab a pace desoldering handle, feed the heater 12/24V, and have at it.
The pace tips are hollow.

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2001\03\01@160812 by Dan Goddard

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At 11:52 AM 3/1/01 -0800, you wrote:
>source= http://www.piclist.com/postbot.asp?id=piclist\2001\03\01\094404a
>
>Robert Severson said:
>"So: Can anyone think of a way to build an inexpensive air pencil? The
>question of surface mount soldering for the hobbyist has surfaced  often. (I
>know someone will mention toaster oven.)"
>
>"How would you make a hot hollow tube? I think a fish tank air pump could
>provide air-flow."
>
>Has anyone tried wrapping a fine copper tube around a high power soldering
>iron? Hose clamps to hold it on. Lots of coils equals good heat transfer.
>Where can you find high temp plastic tube to connect the copper coil to the
>fish pump?

This idea sounds interesting...  I suppose if the tube is small enough, it
could go through the handle and with a long enough tail the source end of
the copper tube would be cool enough for a moderate high temp tubing. You
know, even just a teflon "splicer" between the copper and the plastic tube
would probably suffice. You know that teflon stuff they make the
"Sold-A-Pult" solder suckers with, it'd be the perfect splicer. And
although I'm not recommending this to anyone else... I think I'd make mine
with a corn-cob handle and a wooden power/pump box with old fashioned
analog gauges on it (I guess its just the irony of "Archaic meets Hi-tech").

=D


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-------------------------------------------
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2001\03\01@180237 by Robert.Rolf

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The Weller, WCTP series of irons (the ones that use a magnetic
switch in the tip, that turns off at the curie point), are already
hollow (since the magnetic switch is in the handle).
You'd just have to put a dimmer on the replacement heater element
and blow the air through. 24VAC is the intended excitation, and
the replacement elements are in the $15.00C range.

j newton wrote:
{Quote hidden}

And silver solder (or brazing) to keep it together (since SS won't melt
at normal eutectic temperatures).

> Where can you find high temp plastic tube to connect the copper coil to the
> fish pump?

Teflon tubing. Available at places like Fisher Scientific, and other
laboratory suppliers.

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2001\03\02@041146 by Roman Black

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Dan Goddard wrote:
{Quote hidden}

I have a cheap commercially made attachment
that screws straight on the iron in place of
the normal tip. It is a hollow tube "tip"
connected to a rubber "bulb". It is a cheap
vacuum desolderer. About $20 from memory.
The rubber bulb pops off for cleaning and
the tube even has a flange ready to mount
a rubber hose where the bulb went. :o)
-Roman

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2001\03\02@075914 by severson

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{Quote hidden}

Roman:

This is exactly what was used as part of the "worlds-first air-pencil
soldering iron for under $20". Take a look at http://www.usbmicro.com/apps
for a description and pictures! And thanks for pushing me to make this
happen!

-Rob

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2001\03\02@084706 by Ashley Roll

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what about just blowing down the hose :)

That would make it even cheaper and you get a variable strength air flow..

Ash.

> {Original Message removed}

2001\03\02@093732 by severson

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> what about just blowing down the hose :)
>
> That would make it even cheaper and you get a variable
> strength air flow..

It is thirsty work. Might want to have a drink. Sip cola through a straw,
blow down tube, sip cola, blow down tube, make bubbles in drink, suck on
tube. Aaaahhhrrrrgggghhh!

;-)

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2001\03\02@094608 by Alan B. Pearce

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>Pictures of a working setup with construction details will get you a banner
>at the bottom of every piclist.com page for a month....

Well my setup would be a Weller desoldering iron with the air direction
reversed. These are a modification of the ordinary Weller temperature controlled
soldering iron which uses a special tip with a hole in it to (normally) suck
solder off a joint. The only problem I see is that the tip would probably not
maintain its temperature using the normal temperature control magnet in the
tip - the easiest fix for that is probably to bypass the temperature switch.

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2001\03\02@111654 by severson

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Roman:

> Thanks for the praise but I really did nothing.

You sparked the idea. And you made it sound so obvious (in your 9am message)
that I had a working prototype by a little after 10. Once I figured out the
"trick".


> Just my usual big mouth! Maybe that's where you
> got "pushy/pushing"??? ;o)

The push was more that most of the ideas were there, it just needed quick
action.


> Glad it worked!!
> -Roman
>
> PS. Looks ok. Slightly different to my sucker.
> Mine is an integral "screw on" to a standard temp
> controlled iron type.

This was only $9.99 at Radio Shack. (OK, not worldly, but I'm sure similar
ones can be obtained/ordered for roughly the same price. I wonder if the
Shack will now have a run on these...)


> PPS. So... How does it work? Better than the
> toaster oven idea??? :o)

My tech at work has used the toaster oven idea. He likes it. I have yet to
buy one for myself (at home). My cool new air-pencil works pretty good.
Combined with the inverted clothes iron (I'll find a cheap one to use) I
think that it will do SMT quite well!

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2001\03\02@122442 by jamesnewton

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err... kids, be sure to install a one-way valve if you try this at home. If
your sister pokes you in the ribs while your concentrating on an SMT solder
job and you inhale in shock...

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{Original Message removed}

2001\03\02@122705 by jamesnewton

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Rob nailed this one with pictures, instructions and a critical secret. See
the bottom of any piclist.com page for links to his site.

Well done Rob!

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{Original Message removed}

2001\03\03@050005 by Peter L. Peres

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>Where can you find high temp plastic tube to connect the copper coil to
>the fish pump?

In the model aircraft shop. It's silicone fuel line for engines.

>Pictures of a working setup with construction details will get you a
>banner at the bottom of every piclist.com page for a month....
>
>...and it would be a neat hack.

Not sure about the honor but I'll try to post pictures of my relic on
Sunday.

Peter

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