Homemade electric burner. Encyclopedia of radio electronics and electrical engineering
Encyclopedia of radio electronics and electrical engineering / Beginner radio amateur
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A small hot spiral, powered by an electric current, in skillful hands turns into a kind of pencil, with which various images are burned on wood. This is an electric burner. For its manufacture you will need: a transformer that lowers the mains voltage from 220 V to 2-4 V, 1,5-2 m of stranded wire (electric cord), insulating tape, nichrome wire with a diameter of 0,5-0,8 mm, length 60-80 mm, a wooden blank with a diameter of 30 mm or a piece of textolite (plywood) 7-9 mm thick, M3 screws and nuts, small screws, strips of brass 1 mm thick, twine. We bring to the attention of readers two options for an electric burner, each of which is distinguished by simplicity, reliability and safety in operation.
The first design (Fig. 1). From a wooden throw 30x30 mm, turn a handle on a lathe or use it ready from any tool. On the central axis of the handle, drill a hole with a diameter of 7-10 mm for the power cord.
Rice. 1. Homemade electric burner with a turned handle: 1- nichrome wire, 2 - bolt with M3 nut, 3- contact plate. 4 - self-tapping screw, 5 - handle, 6 - electric cord, 7 - step-down transformer.
Cut out two holder plates from sheet brass, drill two holes in them with a diameter of 3 mm and bend them at a right angle. Having given them the shape shown in the drawing, attach them with small screws to the end of the handle and bring the bare ends of the power cord under the heads, passing it through the hole. On the opposite side of the holders, install clamps for nichrome wire - two M3 screws with washers and nuts. Bend the ends of the heater into rings with a diameter of about 3 mm and clamp between the plates and washers.
The second design (Fig. 2). Make the handle from textolite or plywood 7-9 mm thick, drill four holes with a diameter of 3 mm and fix the brass holder plates. Connect the power cord to the extreme pair of screws of the holders, lay it along the handle, wrap it in several layers with insulating tape, and then over it with twine.
Rice. 2. Variant of an electric burner with a flat handle: 1 - nichrome wire; 2 - contact plate; 3 - bolt with nut M3; 4 - insulating winding; 5 - insulating tape; 6- handle; 7- electric cord.
The electric burner is connected to the step-down winding of the transformer (first to 2 V). The bow of the pointed bend of the nichrome wire should glow to a dark red color. If its confluence is bright red, the heater will quickly burn out. To prevent this from happening, change the length of the heating element from 60 to 80 mm and the magnitude of the applied voltage.
Author: I.Shuin
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