It is usually assumed that the machines provide high-precision accurate and productive execution of relatively complex operations for processing workpieces. This also applies in full measure to jigsaws.
Scope of application of jigsaws
The purpose of jigsaws: sawing curved contours of complex shapes out of sheet metal workpieces and making cuts on the inside of workpieces without disturbing the outer contour. With the help of jigsaws, as well as band saws, wood materials are processed mainly.
This equipment is widely used in the manufacture of furniture, musical instruments and other products made of wood and dense sheet materials. Jigsaws are also bought for personal use in the home workshop.
Construction and characteristics of the jigsaw machine
Structurally, the jigsaw machine consists of the following main parts:
- working table;
- drive;
- crank mechanism;
- saw;
- tensioning mechanism;
- additional devices.
At working table is where the workpiece is located. Many machine models are equipped with a swivel mechanism that allows you to change the angle of the table and thus provide a tilted cut. The rotary mechanism and stops on the surface of the table can be equipped with graduation, facilitating marking. To a large extent, the dimensions of the table determine the maximum cutting length and the maximum dimensions of the workpiece in the cutting direction. Most jigsaws are limited to a cutting length of 300-400 mm.
Power of the electric motor drive can vary widely, but usually for the needs of piece production and home workshop a power of about 150W is sufficient.
The drive torque is transformed crank mechanism in translational-return motion in the vertical direction, which is communicated to the saw. The amplitude of the vertical movement is limited to 30-50mm with a frequency of up to 1000 vibrations per minute. There can be a choice of sawing frequency (speed) to suit the density of the material being cut.
Jigsaw blade 200 mm to 350 mm long, is capable of cutting material up to 100 mm thick. Sawing widths from 2-10 mm and thicknesses from 0.6-1.25 mm are used depending on the type of cut being made and the density of material.
Tensioning device ensures that there is sufficient and even saw blade tension at all points of the working stroke. In jigsaws, devices with spring or screw springs are used.
К additional devices are the drilling unit and the air pump. The drill block is used to prepare the sawing hole for internal cutting. The air pump directs the outgoing jet to blow air around the cutting area and clear away sawdust and debris.
When choosing a jigsaw, pay attention to the main and optional parts: they determine the functionality of the machine and the ease of use.
The most popular jigsaws manufactured by Enkor Korvet, Zubr, JET, Kroton, Dewalt, Hegner, Xendoll.
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