It is convenient to use a miniature drill for drilling circuit boards or making parts for modeling. It is light, quiet, and does not take up much space. Sometimes even the smallest drill on sale is too big for delicate work. If you haven’t found a tool that’s compact enough, you can assemble it yourself.
To make the drill body, you need to cut out and clean the central part of two syringes from the volume scale.
Holes are cut in the center of the blanks: in one for the wires, in the other for the button.
Then 2 blanks for plugs are prepared from sheet plastic.The connector for the charger fits into one plug and Light-emitting diode. The socket from an old Nokia push-button telephone is perfect. One leg LED soldered to the negative of the connector (side contact).
A wire is soldered to it to connect to the battery. Soldering the second leg to the positive of the connector is done through a 1K resistor. Then a rectifying diode is soldered to the same contact, and a second wire is soldered to it for connecting to the battery.
Next, a micromotor is placed in one tube from the syringe, and a plug with electronic equipment is glued in. The second blank blank is glued in front. You need to make a hole in it for the motor shaft.
The wires from the motor and connector are routed out from the side of the tube. The glued plugs are cut off.
A second tube is glued to the assembled part of the body, which will serve as the handle of the drill. Wires are routed into it. It was necessary to make a hole in it and glue the power button. It should close the positive wire going to the engine.
All that remains is to solder the wires from the connector and the motor to the battery, and place it in the drill handle. A plug is glued to it.
After this, you need to put its standard gear on the motor shaft. It will serve as an adapter for connecting a thin drill.
If desired, the drill can be covered with film or painted.
This tool is excellent for drilling sheet metal, wood, printed circuit boards and other materials.
It is recharged using a regular charging unit from a Nokia feature phone. It takes 20 minutes.
Since the electronic component here is not quite the simplest: the polymer battery contains a controller, after this time it is not necessary to turn off charging.
