Thermoelectric jigsaw. Drawing, description

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Thermoelectric jigsaw. home workshop

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The jigsaw is a common tool. However, when working with it, the guys sometimes face certain difficulties: the file breaks, jumps out of the clamps, and often twists when cutting along a curved contour, which makes it difficult to maintain the required direction.

It is much more convenient to use an electric thermal jigsaw, which allows you to cut parts of any shape from both plywood (wood) and organic glass, ebonite and other combustible or melting materials. This increases the convenience and quality of work.

The general view and main dimensions of the electrothermal jigsaw are shown in the figure, however, they depend on the dimensions of the manufactured parts.

Thermal electric jigsaw (click to enlarge): 1 - M4 screw, 2 - gasket, 3 - nichrome thread, 4 - M4 wing nut, 5 - earring, 6 - bracket, 7 - power cord, 8 - switch, 9 - lining, 10 - handle, 11 - tubular arc

The jigsaw consists of a tubular bow, a handle, an electric button, a nichrome thread, screws with wing nuts, an insulating gasket, an earring and an electric wire.

The arc is made of duralumin tube Ø 12 mm. It can also be made from plywood. This part should be light and strong. The handle is made of textolite 10 mm thick. It has a cylindrical shank, the diameter of which corresponds to the opening of the arc tube. A groove is cut in the shank for the power wire passed inside the tubular arc.

The earring - made of 1 mm thick copper sheet - is fixed on the arc with two screws. The end of a nichrome thread (heating element) is attached to it with a screw with a wing nut. An electric button is installed on the handle between two cheeks made of sheet duralumin 0,8 mm thick.

An electric iron coil is used as a heating element; the most suitable - Ø 0,5 mm. The length of the thread depends on the length of the tubular arc. The nichrome thread is fixed with some tension.

The electrothermal jigsaw is powered by a voltage of 12-14 V; when cutting, it is advisable to use a rheostat. The value of the current consumed depends on the material being processed, the length and thickness of the nichrome thread. With the dimensions of the arc indicated in the figure and the diameter of the nichrome filament of 0,5 mm, the current consumption for different materials is 3-5 A.

Before starting work, depending on the type of material used, the required current is set by the rheostat. It must be taken into account that with a high current (high temperature of the thread), plywood can flare up, and with insufficient heating, the plexiglass only softens, but is not cut.

The electric jigsaw is simple in design, easy to use, allows you to cut (burn out) parts of any shape.

The disadvantages of the tool should be attributed only to the fact that when sawing, smoke is emitted with an unpleasant odor from the material being processed.

Working with an electric thermal jigsaw requires compliance with safety measures: hands should be protected from burns, flammable objects should be removed from the workplace, and the room itself should be constantly ventilated.

Author: P.Kapitonov

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