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DIY Mini Pencil Pencil Soldering Iron DIY

DIY Mini Pencil Pencil Soldering Iron DIY

Hello to all the masters and those interested. In this article I will tell you how to construct a mini USB soldering iron from a pencil lead and from other materials at hand do it yourself.

The property of graphite to conduct electric current has been used for a long time, for example, graphite brushes are used in electric motors. The stylus of a modern pencil has low resistance and enough current can pass through it to illuminate the bulb. In the manufacture of pencils, dry graphite powder is mixed with clay and water. The more clay, the harder the pencil, the more graphite - the softer the lead. After the formation of a pasty paste from the mixture, it is passed through a molding press, getting thin sticky ropes. They are straightened, cut to size, dried and sent to the kiln. Wooden blanks of cedar or pine are cut in half along the length and a groove for the stylus is cut. Both lead halves are then glued together. Plates are cut into pencils, their outer side is polished. This is how a pencil and its stylus are made. And so, the electrical resistivity of graphite is 13 (Ohm * mm2) / m at normal temperature (20 degrees). Well enough theory, it's time to move on to the manufacture of a soldering iron.

To make a soldering iron, I needed:



1) drill,
2) Glue gun and hot glue,
3) Clerical knife,
4) Insulating tape,
5) scissors,
6) Pliers.



1) wooden plank,
2) Handle with a push
3) A simple pencil,
4) USB cable from charging the phone.


First, take a wooden plank and cut it with a sharp clerical knife.


It is necessary to cut so that the plank is round in shape with a diameter that crept into a fountain pen.



On one side we drill a hole with a drill, equal in diameter to the pencil lead.


We begin to strip the USB cable from insulation with a clerical knife.



We take the pen and free it from unnecessary parts.



The spring from the handle must be left. We still need it.


We stick our USB cable into the handle.


It's time to cut off the extra wires: green and white.Black and red do not cut.


We push our wooden blank into the hole in the handle. The workpiece hole should be outside, and not inside the handle.


Now you need to strip the remaining wires from insulation.


Now we need a pencil lead. To do this, take the pencil itself.


Cut off a small part of the pencil.


Now, carefully, cutting with a clerical knife, we get the pencil lead itself.



The resulting lead is pushed into the hole of the wooden blank. The main thing is not to break the stylus, so this process must be performed carefully.



We wrap the red wire on the stylus.


Next, take the spring pending for later from the handle.


With pliers we bend its end, as shown in the photo.


We hang the spring on the pencil lead and glue it on the wooden part with a glue gun.


We wind the black wire onto the spring and insulate it with hot glue.



For greater strength, we wind our design with electrical tape.




Well, that’s it, the mini USB soldering iron is ready. The design, of course, was not very powerful, but soldering thin, small wires is possible. And that’s all for me. Thank you all for your attention! Good luck to everyone and bye!
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17 comments
And what for a person without a tester a micro-soldering iron?
As far as I understand, the maximum heating will be between the connection points of the wires (good section, powered by a powerful source)? Soldering iron rods are made of materials with good heat capacity and thermal conductivity.
I had to see a photo where something like trying to power from the MacBook! Barbarism.
Quote: alexgameplay
And who displaced everyone so hard?

Most likely a pencil polisher. )))
Quote: nik2457
The problem is that there is no ammeter, otherwise I would have measured the current consumed by the soldering iron.


Clear! A simple tester will certainly help you. Good luck in crafts yes
And who displaced everyone so hard? What a "good" man!
Author
The problem is that there is no ammeter, otherwise I would have measured the current consumed by the soldering iron.
Quote: nik2457
I connect this soldering iron to a 1 amp power supply.


Have you tried it through an ammeter? Well, that would really check. I understand, it is necessary to disassemble everything scratch I just always start from the current consumption.
This soldering iron for smd details?
Author
I connect this soldering iron to a 1 amp power supply.
If hot-melt adhesive does not detach from the spring, then the lead is not very hot. Logically, the spring from the sting should warm up. Eh ...... maybe the author will say the current, it’s interesting after all.
Interesting craft. And what current does this unit eat? You can roughly calculate the power of a soldering iron.
He took not just electrical tape
It indicated exactly what hardness a pencil should be and what length in mm is needed
Of course! The specific resistance of the lead is not equal to the resistance of graphite. Although the names are similar. )))
The little one is CORRECT !!!! .... About this NINNADA !!!! friends
In general, the use of a pencil lead as a heating element "has a place to be" ... (Not a sting, of course))))).
In the early 80s, I did something similar. A detailed description was in the magazine "Young Technician". It indicated exactly what hardness a pencil should be and what length in mm is needed ... The sting was made of copper wire.
... I don’t remember the details, but the soldering iron worked - I soldered them the “CT-shki” so as not to overheat. (Then on sale, the weakest was 40-watt with a "bomb" near the sting ...)))))
It was remembered that it was there that I learned the technology, which I then used many times: if fluffing asbestos paper into fibers (kerogas strips were sold then), or finely cutting asbestos cord, and then mixing with then clerical glue (liquid glass), then after calcination we get something like "rosette" ceramics. You can sculpt any form of electrical / thermo insulator, you can stick a bolt, and after calcining, unscrew and the thread remains inside ....
What did you dig? All painted step by step, chewed. They even used electrical tape, again, wrong ?! The author writes a soldering iron !!! What's wrong?
And solder "maybe" ... and it will be ?! He himself did not check, he was in a hurry to share with us.
their outer side is polished.
Where did such "deep" knowledge in pencil production technology come from? )))
the electrical resistivity of graphite is 13 (Ohm * mm2) / m
We will use the kindly provided information. The lead section is taken equal to 2 sq. Mm. 1 meter stylus, therefore, has a resistance of 6.5 ohms. The current flows through about 1 cm of lead, which means that the resistance of this section is 0.065 Ohms. I will not even try to divide 5 V into this smallness, since it became scary for the power source and for the frail supply wiring.
The author can clarify, given at the same time a remark max59how will this work?
And how are you going to solder, dear? a soldering iron implies the presence of a sting, and the solder will not “stick” to the heated graphite)))

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