Electric spark pencil. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Ham Radio Technologies
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The electrospark pencil allows to apply inscriptions on a smooth surface of metal. The pencil consists of a coil wound between the cheeks on a copper or brass tube, a steel core (not hardened), which can move within a small range in the axial direction, a spring (made of steel wire with a diameter of 0,25 - 0,3 mm), one end abutting into the core, and the other into a textolite plug screwed into the tube, and a working electrode made of steel (a sewing needle) tightly inserted into the split end of the core.
The core is inserted into the tube and with light blows of the hammer its end is rolled into the groove of the core. After that, brass cheeks are put on the tube and soldered. Near the front (according to the figure) cheeks, the end of the coil wire (PELSHO 0,5-0,6) is soldered to the tube and the wire is wound round to round over the entire surface of the tube in 6 - 8 layers. The second output of the coil is made with a stranded mounting wire (for example, brand MGSHV) with a cross section of at least 1 mm2, to the end of which a crocodile clip is soldered.
The winding is protected from accidental damage with a layer of varnished cloth, over which a polyvinyl chloride insulating tape is evenly wound. After that, a spring is inserted into the tube (15 - 20 turns), a plug is screwed in (M5 screw), and an electrode is tightly inserted into the split end of the core - a steel needle with a diameter of 1 mm.
During operation, the metal part, on which it is necessary to apply a drawing or inscription, is connected to one of the outputs of the step-down (5 - 10 V) winding of the transformer, and the other output of the winding is connected to the crocodile clip on the output of the coil. Having moistened the surface of the part with kerosene (or turpentine), they touch it with the tip of the needle. In this case, the power supply circuit of the coil is closed and the resulting magnetic field draws the core into the tube. The chain opens. Then the core under the action of the spring returns to its original state and the needle again touches the metal. A spark occurs between the needle and the surface of the workpiece, which leaves a mark on the metal.
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