How to check the mitre saw

Setting up a crosscut saw video

Circular saw (cut-off saw) is made by some companies producing power tools. It is used in everyday life and by specialists. For this reason the device has many varieties, different functionality, size, power and price. Customer choosing a tool is guided by his needs and abilities. Someone needs a facing tool for infrequent use. For example, to carry out repairs in the apartment or to produce wooden doors and windows in the summer cottage. And someone uses a saw on any day at the workplace. Focusing on all of these requirements, the tool is chosen for domestic or otherwise professional needs.

To saw material manually at an angle, and evenly, it is necessary to put a lot of effort and use special devices. To facilitate this process, electronic mitre saws were invented. They allow you to saw blanks exactly at the required angle and slope. In other words, to change the angle of course in both horizontal and vertical plane. The tool is used by installers, cabinetmakers and finishers. Circular saws are used for the production of furniture, doors, skirting boards, windows, flooring, and much more. The machine can be used not only for cutting wood, but also plastic and iron corners and pipes.

Trimmer saw is comfortable, easy and fast to operate.

Design features

Trimmer saw is not too complicated structurally. Main parts are cutting head with blade for sawing and base. bed with turntable. The blade is driven by a motor.

There is a handle to control the tool. Motor is located to the right of the saw blade. There are models in which the disk is located at the back. this is done for greater convenience of working with equipment and to provide better visibility to the operator when he saws the material at an angle.

Now we should highlight a number of points. The saw blade rotates as a result of the motor and the gear unit running.

There can be two gears, each with disadvantages and advantages. Toothed during tool operation eliminates the possibility of slippage. Belt saw sends less noise into the surrounding area and the blade does not shake at all.

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On the one hand, it saves the motor, but on the other hand, the belt itself wears out rather quickly and, being a consumable, cannot be replaced under warranty. There are models without a gearbox. Their torque is low, but the probability of failure is also low due to the minimum of rubbing parts.

The motor itself can be asynchronous or collector.In the first case, during the operation of the saw there is less noise, plus such a motor can last longer in constant operation. As for the second type, such saws require regular maintenance, and most importantly, the high torque is their main advantage over the first. On what type to base the choice of crosscut saw must be decided on the basis of the work to be done.You can only cut a workpiece at a specific angle when the base plate is rotated.The domestic class tools can allow the turn of the table only in one side, professional. in two sides, and it is important if you have to work with the workpiece of complex shape and large size.

Typically there is a 45º angle of rotation to each side. Can be 50º and 60º, and in different directions in different ways.The table swivels in relation to the guide which fixes the position of the workpiece on the bed. This way you can trim parts in any position without having to reset them.

Miter Saw Safety

Professional saws have the ability to tilt the cutting part of the head.This is required for bevel cutting. Models can be slewed to one or both sides of 30º, 45º, 47º. A small note about this part of the tool: look at the ease of movement of the cutting head, too tight a move will require a serious physical effort from the operator, which is quite costly for prolonged work.

Tool selection criteria

How to choose a crosscut saw to make it serve long and properly? The following points should be taken into account when selecting a trimmer:

mitre

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When selecting a crosscut saw it is advisable to use a tool with a blade that has a diameter of 20 cm.

  • The purpose of the tool. For infrequent use, a crosscut saw with standard functions is suitable. For more frequent and complicated work it makes sense to buy a professional variant.
  • Ensuring safety. There must be a cover that completely covers the blade. It is removable in operation. The saw should be equipped with an automatic shutdown system in case the disc jams. There must also be a system for quickly and firmly securing the workpiece to the table. The safest saws are produced by: Corvette, Makita, Bosch, DeWALT, Metabo, Hitachi.
  • Size and weight of the tool. A saw that is too heavy will make it hard to work. The operator will experience fatigue.
  • Ergonomics. A sliding compound mitre saw must be as convenient as possible.
  • Diameter of circular saw blade. We recommend that you choose a tool with a 20 cm blade or more. Its maximum diameter is listed in the motor manual. Blades with narrow grooves and wavy lines generate less noise. The arbor hole comes in diameters of 25 or 30 mm. Larger teeth produce coarse cuts. Do not use them for a clean cut on laminate workpieces or workpieces coated with expensive lacquers and paints. Smaller blades are required for these workpieces. Fine-toothed blade can even cut aluminum workpieces.
  • Width and depth of cut to be made.
  • Base and swivel unit quality. The strongest discs are made of magnesium alloys and aluminum.
  • Additional work area illumination allows you to work in poorly lit areas.
  • Some manufacturers have installed a crosscut saw with an electronic system that keeps the speed of the blade constant regardless of the load.
  • Speed of the saw blade rotation. The higher it is, the cleaner the cut is. RPM adjustment function allows to cut wood, plastic, aluminum, plexiglass, cement-bonded particle materials.
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Vorskla PMZ-90-255

Recently I was able to test a little bit of this saw. Despite the stylization of the name (fashionable now), before me was a purebred Chinese, in a sense, the analogue of LS 1040.

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The feeling of this trimmer, as if the foreign cars peresazhivayusya in Zhiguli. seems to go, but somehow not very. The most important thing is the backlash in the settings, so high precision cutting is simply unattainable. Components of the engine case and the control button are roughly made. Safety guard interferes with operation a bit (it was removed by the owner). The motor is powerful. 2100 watts, which is as much as 450 watts more than the Makita, this at the same speed (4500 rpm./min.). Works louder, but not more productive, warms up well. requires regular breaks. Sawdust stubbornly flying past the dust collector. I’m glad about the broaching mechanism, it is possible to saw a sawn billet under 30 cm in width somewhere. To tell the truth, the console moves a little bit stiff. There is no soft start, no disk brake after power off. In other respects everything is OK. It is hard to say anything about the durability of this device, because this model has not yet been properly tested in battle.

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If PMZ-90-255 will not crumble under load, you can recommend it as an option for home use, where you do not need super-precision, and at the head of the corner becomes the speed of cutting. The price of such a machine is about 170-180, that is, instead of a Makita LS 1040, you can buy two and a half Vorskla PMZ-90-255.

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Main faults and their symptoms

To the typical faults of manual circular saws we can refer the following situations.

  • The saw doesn’t turn on. The power cord, electrical plug, start button or electric brushes may be faulty.
  • Tool motor is very hot. These symptoms can be caused by inter-turn short circuits (interruption) in the armature or stator coils or by the machine being operated too intensively.
  • Unit gearbox is overheating. The unit may overheat due to bearing failure or lack of lubrication of the gears.
  • Brushes are sparking. It is usually caused by excessive wear and tear.
  • A burning ring is visible around the motor collector. If the machine exhibits a circular spark around the motor collector, the spark can be caused by a faulty armature winding or graphite dust clogging the space between the collector blades.
  • The unit does not develop the required power. The drop in power may be caused by a mains voltage drop, defective motor windings, worn electric brushes, defective start button.
  • Squealing and other noises can be heard when the unit is running. These symptoms can be caused by broken gear teeth or faulty bearings.
  • The motor is humming but the machine is not running. There could be a blockage in the gearbox.

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