How to choose the motor for the circular saw

What electric motor for the circular saw?

Here it all depends on the power of the machine. The best choice is a motor with a belt drive, so that the speed is transferred directly to the saw. If you plan to install a 35 cm disc on the circular saw, you will need 1 kW of power to start it up. The saw, whose diameter will be 17 cm, runs from 500 watts. This means that it is quite suitable engines from old washing machines brand Sibir or Oka. The only thing left is to adjust the engine speed, because unstable rotation will cause the saw to “tear” the wood.

For the number of revolutions of the engine in the washing machine is responsible tachodactor, which controls the control module. But since the module can not be connected to the circular, it is recommended to install a voltage regulator.

How to connect the electric motor is considered an important working step, and if you can’t do it right, then you can’t expect normal work of the circular saw.

Make a Simple Circular Saw Cutting Guide | Rockler Skill Builders

What voltage to use: 220 or 380

220 V voltage is ubiquitous in household electrical networks, but devices under 380 V are considered more stable and powerful. In principle, both parameters are able to meet the conditions for connecting an asynchronous motor for the circular saw.

It is better to use 380 volts, t.к. It allows you to use a more powerful motor, moreover, with a high torque.

If there is no 380V voltage in the house, then you have to use 220V.

There are situations when there is a motor for 380V, but the voltage in the house is 220V. How to connect such a motor?

How to connect a 380V to a 220V voltage

All possible wiring diagrams for converting 220 V to 380 V are indicated on the nameplate of the electric motor. Therefore, first look at it and first of all be guided by what is written there.

In practice, when connecting a conventional induction motor, 2 methods are used:

  • frequency converter. Its purpose is to convert 1 phase at 220 V to 3 phases of 380 V with exactly the same voltage parameter. Frequency converters are expensive, so they are rarely used for conversion in the home;
  • By means of a capacitor. You need a device for alternating current. But the capacitor should be connected to one of the motor windings. in this case there will be a phase shift, and there will be a torque due to the formation of EMF in the magnetic field.

Do not use capacitors for DC in AC mains, because in the process the device can overheat and explode.

Watching the video you can see two practical ways to connect an electric motor at 380V to a domestic AC network.

Circular pendulum saw with electric motor

To make a homemade circle, it is easy enough to cut logs and blocks of wood, the thickness of which corresponds to the strength of the electric drive installed on it. If you are going to work with large and very thick wooden blocks, then you need to equip your homemade saw with a really powerful electric motor, as well as a shaft and belt drive. The best solution in this case. Install a special pendulum bed.

When making self-made pendulum circular saws, only very strong steel angles should be used as frame material. Next, on the ready-made steel frame you will need to place all the mechanisms necessary for the normal operation of the homemade circular saw. Thanks to this design, you can effortlessly adjust the height of the blade, avoiding unnecessary complications with the construction.

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How to choose the right motor for the duty cycle?

There are two electric motors for sale in the store window. Both. capacity 2,2 kW, 3000 rpm, supply voltage. 220V (single-phase), on feet, size 80 (shaft diameter 22mm), the price is approximately the same (the difference in price 10%), production of different plants. What is the better choice of the electric motor ?

And here we recommend to pay attention to such parameter of the electric motor as the mode of its operation. Look at the photos of the nameplates on the electric motors: one motor has mode: S1; the other: S6-40% :

Moving parts

Having connected the motor and checked that it normally rises and drops speeds, you can proceed directly to the circular saw device.

Let’s figure out which moving parts, on which the main load falls, we will need:

The operation of the drive should be carried out as follows. The motor transmits the rotation to the shaft, on which the small pulley is pressed. The last one has a belt that sends revolutions to the second pulley. At first glance, everything seems simple, but when the installation of the circular saw is carried out, there are many difficulties to be solved.

The small pulley must be ground. three or four cross grooves are made in it, so that the belt can get a good grip.

The belt may not be used from an old washing machine, it is enough to take an analogue from another machine. The main thing is that it must be strong and have teeth.

choose, motor, circular

A disk with a slightly larger diameter is welded to the edge of the large pulley to get a projection that prevents the belt from slipping during operation. It is not necessary to grind a serration on this pulley, the grip of the belt is quite sufficient.

The shaft that holds the circular saw, fasteners in the form of a washer and nut should be reliable, so that at maximum speeds the saw is not deformed and does not come off, injuring workers. It is recommended to use a shaft and fixture from a factory-made circular saw.

The procedure for setting up the circular saw is described for the saw with three hundredths of a disk. Many will say that the engine from the CMA will not pull such a saw and will stop. But there are a few rules to keep in mind here:

choose, motor, circular
  • You need to know how to work properly on the circular grinder;
  • saw for household purposes, designed to work with small amounts of materials;
  • successful operation of such a saw is confirmed by numerous reviews.

Simply put, the saw should not be excessively overloaded, and it is better not to work it at idle speed.

Circular from the angle grinder

This variant of making the machine is more popular, as a rare owner, who likes to do everything with his own hands, does not have, or in the near future is not going to buy, an angle grinder. The first step in building a stationary saw system is also the construction of a special table for holding the angle grinder.

In this case, the process becomes more complicated, because the main difficulty is to think about how to attach the angle grinder to the bed: how to make a sliding stop and an axial handle. However, there is a prefabricated method that allows for a secure connection.

  • To make the sliding stop take two pieces of steel angle. Fasten them on both sides of the saw blade. Then they are connected by a cross tie (bolts and nuts). Washers are used to provide the necessary clearance.
  • Beforehand, a metal band clamp is stretched over the tool, the screw tie of it should be at the bottom. A metal strip, folded in half, is attached to the holes designed for the sliding stop.
  • In the gearbox of the angle grinder make several holes for bolts: first disassemble the body, then mark the points for drilling. They will be used to fasten the axis handle. This element is made from a rod or metal pipe. The handle is given the shape of a staple. At the ends, where they are fastened to the gearbox, holes are drilled.
  • Make a rod, which must adjust the depth of cut. It is made from a piece of metal bar. Form a hinge on one side of it, then rivet it slightly, drill a hole designed for the stop bolt. On the other end, threads are cut, screwed on first one secure nut, and after assembling the structure. the second. The sawing depth will be adjusted by tightening or loosening them.
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Not too complicated actions will make it possible to obtain a full-fledged circular machine for cutting various materials. Proceed in the same manner with the drill, which can somewhat replace the angle grinder. To avoid potential mistakes, it is better to use the drawings, which can be found on the Internet if you want.

Select the disc for the particular application

For clean cross-cutting of solid wood, decorative plywood sheets and other panel materials, use a 50-60 teeth blade that has a cutting edge like a planed edge. Do most of the operations that do not require high quality with a cheaper 40-toothed circular saw blade. Use a saw blade with 18-25 teeth for cutting solid wood along the grain, and use a blade with 10 teeth for ripping boards for installation of a batten frame or for demolition work where material is not chipped.

choose, motor, circular

Use discs with 60 or more cutters for non-ferrous metals and plastics: negative gradient for thin-walled and positive gradient for thick-walled profiles. For sawing gypsum fiberboard and cement-based materials use special saw blades with 4 to 6 teeth reinforced with synthetic diamonds.

Want to get a perfect cut of a furniture board immediately for the finish sanding? If your circular saw is at least semi-professional. put a 40-cutter disk with teeth straight/trapezoidal and negative slant (designed for aluminum and laminated chipboard). Drive the saw slowly, overcoming sensitive resistance, perhaps at the power limit. The result will be worth the inconvenience: the cut will be smooth. under “nullivka”, and you save time that previously went to the finishing of the front edges.

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There is no saw blade that fits every tool and is able to provide quality and productivity at the same time. You have to pick up a few options, considering the most common tasks you perform.

Hundreds of years ago the great minds of mankind had the revolutionary idea to replace the reciprocating motion of a hacksaw blade with a circular motion. Thus circular saws, also known as circular saws, were born.

They have become great helpers in production, as well as for a number of household works. Exactly the question how to choose a circular saw for home is dedicated to this material.

Useful tips

Making a circular saw with their own hands, it is recommended to provide opportunities for its repair and maintenance. Any moving part must have convenient accesses for lubrication. Beginning all installation work, you should prepare detailed drawings and diagrams, make the appropriate calculations. Self-made circular saw differs in size and can easily fit in a utility room.

If you do not need to work with massive wooden workpieces, you can make a small stationary saw from off-the-shelf power tools.

Circular saw

The handheld circular saw is a finished and reasonably safe tool.

Handheld circular saw on rails

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There are two options for stationary use:

Popular: How to choose a circular saw for home. analysis of different models

The workpiece is stationary, and the circular saw, moving along the guides on the carriage, makes cuts at the desired angle. This uncomplicated-to-make machine can really do wonders with small workpieces.

How to use a circular saw as a circular saw, you can see in this video

Circular mini circular saw: instructions for making

The base for the mini circular saw

In order to make such self-made machines, you will need:

Design of a circular saw with a separate motor.

The mini-circular saw must stand on a solid and stable table, because any swinging can be dangerous for human health and also interfere with the normal operation of the saw. Before you start to make a machine from a manual circular saw, you need to make a special table. In this case you can use metal trestle and an old kitchen table as a frame. To begin with, you will need to connect the sawhorse to each other with a wide wooden board at least 50 mm thick, and then fix the kitchen table on this base.

You can make the tabletop itself from two metal (preferably steel) plates with a cross section of about 4 mm. In addition, for this purpose you can also use thick wooden bars.

It is important not to forget to leave a small gap between the metal sheets, the size of which is usually 10-12 mm.

At the same time, you need to make sure that the edges of the metal plates were perfectly parallel in relation to each other. Now that the table is completely ready, you can proceed to attach the circular saw itself to it. It is important to note that it should be fixed from below, so that its cutting disk is directly in the gap between the two plates of the table top.

Installing the motor

To make a homemade circular saw, you need to think in advance, with which device the force from the motor will be transmitted to the cutting disc. Small equipment can be placed directly on the motor axle. However, this will not have the best effect on the power of the circular saw, made by your own hands.

The usual bicycle spindle can be used as such gear, without which the operation of any circular saw is impossible. This is often the name given to the housing that houses the shaft with the bearings. To cut it off the bike you can use a hacksaw. In this case, the sprocket is not useful to you, as in this case it is better to take it from the engine D6 or D8. In order for this sprocket to fit securely on the new shaft, you will need to make a reducer bushing. Before you mount the circular saw to the bicycle spindle, make sure it has the right bore size. Now, with that information in mind, you need to size the outside diameter of the sleeve designed for the adapter. The bushing has to be attached to the spindle in several places at once. Then mount a plate at least 5 mm thick on the housing of the spindle assembly.

Now take a sprocket, about 2-2.5 times the size of the one that was previously installed on the spindle, and install it on the homemade circular saw. And at the end of the work on the saw making with my own hands, when all its parts will be well fixed, put the chain on and you can use it for its intended purpose.

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