What can be sawed with a circular saw
Today we will continue to talk about the tools needed in the carpentry workshop. Let’s find out the difference between a circular saw and a circular saw.
Some beginners don’t understand the differences between the two tools well and often confuse them. The thing is that they both use the same working body. a circular saw blade. It is a steel disc with teeth on the outer rim like a saw. The circular saw blade is mounted on the motor axis. When working it rotates and cuts the material.
The main area of application of these saws is woodworking. Equipped with the appropriate saw blade, these tools can also be used for aluminum and plastic work.
What is the difference between cut-off saw and circular saw??
Design features of circular saws
First of all, it is worth remembering that the circular saw is designed for longitudinal as well as cross cutting of wood (wood materials), plastic, non-ferrous metals. High productivity, precise and fast straight-line cutting makes the circular saw is indispensable for various woodworking jobs. roofing, flooring, furniture production, etc.д. In the presence of special circular saw blades, the saw can easily cope with sawing profiles of non-ferrous metals, which are often used in the manufacture of modern furniture. This tool is very easy to operate, but safety precautions are extremely important. Careless, improper use can be too expensive. Over the years, the design of the circular saw has changed little. Naturally, the ergonomics of the tool has improved, the engine power has increased, weight has changed, but the biggest changes have affected the saw blade. In recent years a huge number of circular saw blades have become available for a wide variety of materials such as wood, laminated materials, aluminum, etc.д.
Perfect Cuts With A Circular Saw. 200
The design of a circular saw is very simple and consists of :
The body of the circular saw is most often made of wear-resistant, heat-resistant plastic. Sometimes there are models with metal bodies, but this is an exception to the rule. Given the fact that circular saws often have to work in very dusty environments, many manufacturers pay special attention not only to the cooling and ventilation systems of the tool motor, but also to the removal of chips from the working area.
This is good for the health of the end-user in particular, because it reduces the impact on the lungs. All modern saws can be connected to a compulsory dust extraction system or to an industrial vacuum cleaner by means of special adapters. Some manufacturers, such as Makita, equip their products with a stationary system for chip and dust extraction. For example, the Makita 5017RKB circular saw of 1400 W power, 190 mm blade diameter is equipped with a special container for collecting sawdust generated during the sawing operation. Such system allows to remove more than 90% of sawdust, which is formed during the work. You should agree that this is a very high indicator.
Some manufacturers use quite unusual solutions not only to facilitate the work with the tool, but also somehow distinguish their products from the crowd. For example, the company WORX equipped their circular saw Worx WT431KE (power 1500 W, diameter of the wheel 185 mm), the so-called “revolver handle.
Handle with start button has ability to tilt up to 60 degrees. This is quite interesting and quite useful solution, as the operator can adapt the tool to their anatomical features. It should be noted that this design solution is used only on WORX products.
All circular saws are equipped with a collector-driven motor with a power rating of approx. 500 W to 2.5 kW. Naturally the power of the engine will determine such a basic sawing parameter as the cutting depth. Engine power will also have a big impact on RPM. Recently, the number of saw blade revolutions on circular saws has almost doubled.
Circular saws had the rpm around 2,5-3,5 thousand rpm some 10 years ago.∙min as for example in a Makita 5143R circular saw with a motor power of 2,2 kW, disk diameter of 355 mm, 2700 rpm.\min. This saw has been made by Makita for more than 10 years, and that’s why we cited it as an example.
Modern saws, such as the Bosch GKS 85 circular saw with a motor power of 2.2 kW and a saw blade diameter of 235 mm, already have a speed of 5,000 rpm.\min.
It is worth remembering that cordless circular saws have appeared on the market. For example, Bosch has developed a whole line of cordless tools, which includes several types of circular saws with different battery capacities and capacities. Quite recently, the Bosch GKS 36 V-LI Professional circular saw has been presented, which is equipped with the most advanced 36 V lithium-ion battery packs with four times longer life. The saw is equipped with a disc diameter of 165 mm and has a disc speed of 4000 per minute. The tool weighs only 4.8 kg. There are not only professional battery-powered tools, but also a whole range of tools for household purposes. Unlike many other tools, such as angle grinders, drills, peorators. Circular saws do not have a special latch that would keep the start button in the “on” position. This is caused by safety requirements.
Another interesting option appeared in circular saws. a laser pointer, which shows the directions of cutting material. If previously sawdust in the course of work with a circular saw could fill the marked line for the cut trimmer, now with a laser pointer this will no longer be a problem, especially since the dust extraction system effectively enough to remove all sawdust from the working area. Special attention when choosing a saw should be paid to its platform. To reduce the cost of the product, many manufacturers use a pressed platform for circular saws, but for professional use it is better to buy a saw with a cast aluminum platform. Only then the work can be done with maximum precision. Such platform is less subject to all sorts of deformations. Many manufacturers place special marks on the platform, which allow you to control the process of sawing material. It is a kind of sight with which you can accurately perform the work of cutting materials.
The design of the circular saw is simple, which is probably why it is so easy to handle. It consists of:
How To Make A Straight Cut Using A Circular Saw
- electric motor;
- saw blade;
- The body, which has one or two handles;
- a blade guard that covers the blade at the top and bottom (the lower part is movable and slides away automatically during operation)
- A platform that allows you to align and hold the disc in the right position;
- a wedge-shaped blade that keeps the blade from getting stuck in the wood.
The circular saw blade is secured to the motor shaft with one or more screws. the blade is easy to change in just a few minutes. You just need to unscrew one or more bolts, remove and put the disk, putting the fasteners in place.
The structure may be slightly different. instead of a battery, there is more often an electric cable
The electric motor is attached to the platform. On more expensive tools this mount is movable, which allows you to change the angle of cut. This angle is usually from 0° to 45°. it is set up differently by different manufacturers. Most often there is a scale with fixing screws. You set the angle, tighten the screws, so the blade gets a certain tilt.
Cordless circular saw
It wasn’t long ago that such machines seemed like nothing more than science fiction. But time goes on, wireless technology gets to a new level. Batteries have become so capacious, special motors so economical, and chargers so fast, that even for such a powerful tool as a circular saw, the developers managed to organize an uninterrupted power supply. Take two modern batteries and half an hour charging. that’s all, no problem with energy (Makita BSS 610 RFE). It is even easier if your circular saw is equipped with a battery from the same manufacturer as your other tools. Power characteristics (output power, torque) of cordless circular saws are not inferior to similar networked machines. Bosch GKS 18 V-Li (cutting depth 51 mm). Well, as for mobility and ergonomics, they are beyond any competition, and they are especially loved by roofers-operators, working at heights.
Makita BSS 610 RFE
Safety guidelines for circular sawing
Circular saws are characterized by a relatively high risk of injury, so when you work with them, it is necessary to follow the safety precautions.
Preparing the working place for work
Remove all unnecessary objects from the table. There should be no tools, keys and consumables. You also need to ensure free access to the table. The floor in the working area must be dry to avoid accidental slipping. Ground the machine.
There are also requirements to the operator’s work clothes. Clothing must be tucked in so that there are no fluttering ends. If you have long hair pick it up and put it under a hat. Wear safety glasses and a respirator. The use of ear defenders is recommended, as the noise level of a circular saw can be quite high.
Before you start the saw, check it for defects on the saw blade, make sure it is securely fastened properly. Check if the riving knife is installed properly and then check if the blade guard is working.
If the saw has a short cable, you may need an extension cord so that you can move around the work area comfortably. It is desirable to use a circular saw with a soft start function, so the tool does not jerk when starting.
Safety Tips for Using the Saw
Before you start work, start the circular saw just to idle. Observe the following rules and guidelines as you cut through the material:
- Stand to the left of the machine when you begin cutting so that if you accidentally throw the workpiece, it will not hit you.
- Make sure there are no nails, pins, debris or concrete on the workpiece or its surface that can interfere with the saw.
- Do not pass objects over the circular saw while it is in motion.
- If there are knots or cracks in the wood, guide the saw more slowly when approaching them.
- Always unplug the saw when changing the circular saw blade.
How to cut a board evenly, lengthwise and crosswise
Because of the different design of handheld and stationary saws, sawing techniques for cutting wood differ significantly.
Working with a circular saw
If you need to saw a board along the grain, such as a non-cutting board, it is done as follows:
If the length of the circular saw table does not allow you to cut long boards, you can make a simple device for this purpose, as shown in the following figure.
Boards and squared timber can be sawed at right angles as well as at any angle with this sabre.
Sawing a board with a hand held circular saw
Many owners of handheld circular electric saws face the problem of facing the board along the line. At the very beginning of sawing, the trimmer’s line is visible, but then it is blocked by the hood of the machine. Because the marking is not visible, the cut is uneven.
To cut a board accurately and get a perfect cut, the saw blade must be positioned so that it faces the marking. On the other side of the machine, put an angle piece to the board and push it to the bottom of the machine. Secure the angle piece with a clamp. You get the guide bar mounted at right angles. Trim the board. The result is a perfect 90° cut.
A guide rail is used to cut the board lengthwise. It can have longitudinal slots into which the hand saw electric. Also the bar in the form of a simple long guide rail can be made by yourself. In the second case, one of the sides of the sole of the machine during sawing will go along the guide rail (ruler) fixed on the workpiece. The result is an even, longitudinal cut.
The following figures show homemade guides, the width of which depends on the size of the hand saw’s sole.
Classification of types and sizes
Circular saws are divided into two classes. household and professional. The equipment differs in power, size and diameter of the saw blade:
- Domestic models are small-sized equipment weighing 4 to 5 kilograms, which is usually used for sawing wood at home. Power of the equipment. not more than 1800 watts. Disc size in such saws is 160. 200 millimeters.
- Professional circular saws are designed for processing large amounts of wood. They are capable of sawing bars up to 85 millimeters thick. The weight of such equipment exceeds 8 kilograms, and the disc diameter is 250 millimeters. Professional saws have higher power. over 1800 watts.
There are several types of circular saws available:
- Standard. Model is designed for sawing wooden bars with density of up to 85 millimeters.
- Miniature saw. Small circular saw unit with weight up to 2 kg and power up to 800 watts. Used for cutting thin wood.
- Submersible. Used equipment for cutting holes inside of wood. This saw is designed with a mechanism that facilitates vertical plunge of the blade.
- Diamond. Suitable for cutting hard materials like stone, ceramics or tiles. The operating mechanism of the device consists of a diamond disc that allows you to cut to a depth of 55 millimeters.
- Cordless. Such circular saw has low power and fairly compact dimensions. The device runs on battery power and is often used in the construction of wooden houses.
Circular saws are divided into four types depending on the depth of the blade:
- professional. from 65 to 140 millimeters;
- large. from 70 millimeters;
- medium. 55 millimeters;
- small. from 40 to 46 millimeters.
Number of teeth on the blade is of critical importance for the quality of cut. The smaller they are, the lower is the productivity of the circular equipment. For large-scale processing of wood, special cutting tools with carbide tips are used.
Rules of operation of circular saws
Working with manual and stationary circular saws requires following a certain sequence of operations, which we will discuss below.
If you have to work with a hand-held circular saw, it is first necessary to choose a saw blade appropriate for the type of work to be performed, adjust the cutting depth and inclination of the equipment. The cutting depth of the circular saw is set as follows: The saw blade tooth should protrude from the workpiece either halfway or completely.
- Secure the workpiece to the workbench using clamps (do not hold the workpiece with your hands);
- place the tool on the workpiece so that the blade does not touch it;
- start the machine’s engine and wait for the tool to reach full speed;
- Hold the unit firmly in your hands and perform the sawing while pressing the hand-held saw sole against the workpiece;
- When you have finished sawing, check that the guide bar cover is in its original position and turn it off.
Important! Never leave the unit disconnected from the mains with the start button locked. the circular saw blade should not protrude as far out of the workpiece as the teeth of the circular saw blade should protrude as far as one-half or all the way.
To start using a compound circular cut-off saw, do the following.
- Look for a circular sawblade of a suitable diameter for the material to be cut and install it on the machine shaft. Use a dial gauge or a regular caliper to check the distance from the saw blade to the slots on the table. Check the clearance at the beginning and end of the disc. The maximum discrepancy should not exceed 0,05 mm.
- Adjust the desired height of the blade overhang above the workpiece. It must not protrude more than the height of the cutting element.
- Set the parallel stop at the desired distance from the saw blade. This distance determines the width (length) of the workpiece after sawing the workpiece. It must also be strictly parallel to the grooves on the work table (max. displacement 0,05 mm).
- Adjust riving knife. It should be about 5 mm from the cutters and in line with the saw blade. It is easy to check this with a ruler between the jigs.
- Turn the machine on, wait for the engine to reach full speed, lay the workpiece along the parallel stop and then, holding it against the table and the stop, make the sawing.
Circular sawing operations
The circular saw is a hazardous tool, so working with it requires practical skills. Before sawing, check that all mechanisms and electric cables are in good working order. Check that the saw blade is securely mounted and that the blade guard and riving knife are fitted correctly. Clean saw blade with brush or coarse cloth if necessary.
It is necessary to remove foreign objects from the surface on which the product will be processed, check the stability of the working table and the grounding of the machine. Protect yourself from sparks and wood dust with special clothing and personal protective equipment.
Sawing must be done with the workpiece securely in place, holding the saw unit firmly against the surface of the workpiece. When work is complete, it is important to return the guard to its original position and completely de-energize the power saw.
The circular saw has a balanced, complex operating mechanism. It combines high safety requirements during operation with a high-precision adjustment of all components to ensure quality work and maximum productivity.