An electric spark pencil for drawing on metal. By lightly pressing the pencil against the metal, the pencil electrode will automatically move back and forth. When the electrode comes into contact with the metal, the metal in this place is damaged, sparks fly off. The pencil is powered by alternating or direct current with a voltage of 5-7 V, a computer power supply of 5 V will do
The pencil frame (tube) is made from a 55 mm long gel pen rod. Three layers of copper wire with a diameter of 0.8 mm are wound around the entire length of the rod. The larger the diameter of the wire, the stronger the current for burning the metal. The core is a steel nail, and the electrode is made from a piece of tungsten welding electrode
The power supply terminal is connected to one terminal of the coil, and the other terminal of the coil is connected to the electrode. Another power supply terminal is connected to the metal workpiece. Now, when the electrode touches the metal, sparks and small dots appear in this place. The core will be attracted by the coil during operation and repelled again to the workpiece. The electrode should not be held in one place, but moved from side to side
The coil will heat up during operation; for long-term operation it must be made from a larger diameter wire and wound on a longer frame
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