How the guard works on the circular saw
How the guards on the circular saw works
These circular saw safety instructions are available for free review and download.
1.1. To perform work on the circular saw it is admitted the worker not younger than 18 years, passed medical examination and not having contraindications on health condition, having necessary theoretical and practical preparation, passed introductory and primary instructions on labor protection and training on the special program, certified by the qualifying commission and admitted to independent work. 1.2. In order for an employee to be allowed to work independently on a circular saw, he or she must be trained under the supervision of an experienced worker. 1.3. An employee working on a circular saw (hereinafter referred to as an employee) must periodically, at least once a year, undergo training and testing of knowledge of occupational safety requirements and obtain a permit to work at heightened danger. 1.4. Employees, regardless of qualifications and length of service, at least once every three months must undergo repeated instruction in labor protection; in case of violation of labor safety requirements, in case of a break in work for more than 30 calendar days, they must undergo unscheduled instruction. 1.5. An employee who has shown unsatisfactory skills and knowledge of safety requirements is not allowed to work independently on the circular saw. 1.6. An employee who is allowed to work independently on the circular saw must know: the structure of the circular saw and safety requirements for working on it. Safety measures when using testing and measuring tools. Safety requirements for setting up and participating in machine repairs. Occupational and fire safety rules, regulations and instructions. How to use primary fire extinguishing equipment. Ways of rendering first aid in case of accidents. Rules of internal labor regulations of the organization. 1.7. An employee assigned to work which is outside his/her profession must undergo special briefing on safe execution of such works. 1.8. It is forbidden for an employee to perform work that he/she is not duly authorized to perform, or to use tools and equipment, with which he/she has no skills in safe handling. 1.9. When working with wood and wood products on the circular saw, the worker can be unfavorably influenced mainly by the following hazardous and harmful production factors:. a circular saw blade moving;. unprotected moving elements of the machine;. moving products, workpieces and materials;. increased dustiness of the air in the working area;. increased noise level in the working area;. insufficient coverage of the working area and surfaces of work pieces;. an electric current, which path in case of short circuit can pass through.д.), blanks and finished products, which can lead to fire. 1.10. The circular saw operator must be aware of the possibility of wood defects (irregularities in the wood fibres) becoming a potential hazard, especially in manual feeding of material to the cutting tool. 1.11. During work, the employee must use the required personal protective equipment against hazardous and harmful production factors. 1.12. To prevent the risk of fire, employees must obey fire safety regulations and not allow other employees to violate them; smoking is permitted only in designated smoking areas. 1.13. Given the increased fire hazard of the room in which the wood is processed, the worker should not allow the accumulation of wood waste, sawdust, shavings, clutter the workplace and passages, as well as store flammable and combustible liquids. 1.14. Due to the high risk of injury, the circular saw must not be used by unauthorized persons. 1.15. Employees are obliged to observe labor and production discipline, internal labor regulations, work and rest schedules established for them. 1.16. If an employee falls ill or feels unwell, he/she should inform his/her immediate superior and seek medical assistance. 1.17. If an accident occurs to a worker, first aid must be given to the injured person, the supervisor must be informed and the situation must be preserved if it does not pose a danger to other people. 1.18. Employees must know how to administer first aid, if necessary, and use a first-aid kit. 1.19. Personal hygiene is essential for the worker to avoid any risk of disease, including washing hands thoroughly with soap and water before eating. 1.20. It is not permitted to perform work while under the influence of alcohol or narcotic, psychotropic, toxic or other intoxicating substances, or to drink alcoholic beverages or consume narcotic, psychotropic, toxic or other intoxicating substances in the workplace or during working hours. 1.21. An employee, who has violated or failed to fulfill the requirements of labor protection regulations, is considered as a violator of production discipline and may be brought to disciplinary responsibility or, depending on consequences, to criminal responsibility. If the violation is connected with inflicting material damage, the violator may be brought to material responsibility according to the established procedure.
Assignment and use of tool elements
Circular saws are equipped with many different elements and additional functions. For example, quite often there is an additional handle on tools. There is no sense to talk about its purpose. it makes working with the tool more convenient. The only thing to note, this element comes in 2 types. The most convenient, according to user reviews, is the handle installed on the platform of the saw. often than not, tools are equipped with an additional handle in the form of a mushroom.
The circular saw is necessarily equipped with a blade guard. This element consists of two parts. The lower one is movable, the upper one is stationary. In the upper part there is a special opening, through which the sawdust is evacuated in the course of work. The aperture can have different shapes. If you will not connect a vacuum cleaner to your saw, you can ignore the shape of the hole. If a vacuum cleaner will be connected, it is better to pick up a tool with a round hole, otherwise you will have to look for an additional special adapter.
Circular saws are always equipped with a riving knife. It is designed so that the blade does not get jammed in the process of work. This element is secured by a pair of screws. There is a hole in the blade’s upper cover to make installation and removal of the blade more convenient. But there are some models that don’t have this hole. If you are in a situation like this, you have to put the saw in a position that corresponds to zero-cutting in order to access the mounts. It is rarely necessary to dismantle the blade. It is usually needed when the workpiece has to be sawed from the middle, not the edge.
It is important that you know how to operate the start button. With circular saws it is not quite so simple. This button is connected to a safety mechanism that eliminates the risk of accidental activation of the saw. So you can’t press the button until you press the unlocking button. Thanks to such a solution the circular saw becomes as convenient to use as possible. The button can be a different size. It is more convenient if it is large.
Another important design element is the spindle locking mechanism. It makes it easier to install the drive. Found in most cases only in expensive imported models.
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It is important to know how to handle the power cord as well. It seems very simple at first, but if the saw will be used outdoors in cold weather, it is better to have a rubber-insulated power cord. This option is preferable to the plastic one, t.к. Rubber is more flexible and its elasticity is not diminished by low temperatures.
Quite often modern circular saw models are equipped with various electronics. It makes the tool easier and more comfortable to use. The most common features are soft start, overload protection, speed regulation, maintaining a constant speed level.
How to make a template for the guide with your own hands?
Circular saw guide rail. you can make it yourself by sawing out a straight sheet of particle board from the material you have available.
When it is necessary to make long cuts with such a saw, it is necessary to spend quite a lot of time to make all the measurements necessary to set the guide in relation to the marking line in exact accordance with the width of the base of the construction.
To simplify this procedure, saw a template out of woodchip board, which is equal in width to the distance from the outermost part of the tool base to the inner edge of the saw blade. Next, the template is cut to the length of the tool base. In order to use the template, it is necessary to align its edge with the kerf mark in the product, and to the other side put a straight guide and secure it with a clamp.
Then it is necessary to repeat the given procedure on the second mark of cutting from the other edge of the workpiece, which is sawn. Such templates can be made for a circular saw or an electric jigsaw.
Device of saw guides for different types of saws
Schematic drawing of saw sharpening and setting up. 1) Saw blade. 2) Sharpened tooth. 4) Device for sharpening. 5) Working table for sharpening saws. 6-7-8) File directions, relation to the work table and saw teeth to be sharpened. 9). Sawtooth trimmer line for bending the teeth when breaking up.
The cross-cutting support is one of the simplest and most frequently used attachments. It makes it possible to cut long pieces at 90° and 45° angles quite quickly. The base of the stop is made of textolite, which has a thickness of 4-5 mm. You can also use 9-10 mm plywood. The 2×2 cm bars for the support can be made of oak or beech. The bars are connected to the frame with screws that have countersunk heads. It is important to maintain 90° and 45° angles between the boards for support. If necessary, such stops can also be made for other cutting angles.
If many identical boards need to be cut, a U-shaped crosscut must be made. It is pressed against the lumber to be cut like a “saddle”. This device consists of 3 parts: the back and two side parts. The back is made from a piece of wood, which has a thickness of 23-25 mm and a width equal to the cross section of the bar. The sides are made of textolite or plywood. The width of the sidewalls should be made so that the edge of the tool pad is supported before the saw blade enters the wood of the bar.
It will be possible to accurately cut a large thickness bar in two passes from different sides, and it will not be necessary to remove the stop.
It is also possible to make an edge stop, but you should know that it takes quite a long time to make. Due to the greater length of the support edge, the guide will be able to provide a flatter cut than the designs that come with the saw. The base and the support strip are cut from plywood, which is 13-15 mm thick. Grooves are selected in the base for guide keys, then holes are made for the saw blade and a through groove for a screw for clamping. In order to make the edges of the support strip, dowels, saw mounting rails, you will need to use hardwood. The glue joints of the dowels, edges to the support rail and the tool to the base should be reinforced with small countersunk screws.
It’s not hard to make your own circular saw jigs, you just need a minimal set of materials. It is not recommended to use the designs that come with the saw.
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TOP homemade this month
The sawdust protector for circular saws comes in very handy when you work on a circular saw and sawdust is very annoying flying in the face and over the entire area.
I suggest to see how you can make a protection for the circular table with your own hands.
I will say that it is not an ideal construction, but it copes with the task of protecting the person working on the saw and reduce scattering of sawdust. At the same time the screen is the simplest t.к. I have seen when plywood is used instead. But the plywood is not transparent and it is not as easy to clean as mine.
The whole construction is made of affordable materials.
It works like this: sawdust from the saw blade goes either into the center of the bottle or into the curved walls and falls onto the table. The area of the spread is drastically reduced. What is more convenient to work with and easier to remove sawdust.
How to make a protection from sawdust for circular saws told in the following video, if you have any questions, ask, but I think it’s simple.
Circular saw is required in a private home quite often, but to buy for this expensive tool is not necessarily. You can make a circular saw with your own hands from improvised means.
The principle of operation of a circular hand saw
- The electric motor shaft transmits torque to the cutting disk.
- The saw blade rotates on its axis with high speed, which makes it easy to cut the required surface.
Depending on the depth of cut, the tool is divided into several categories:
- Circular manual mini saws can cut material up to 46 mm thick.
- Medium tool can handle surfaces up to 55 mm.
- Large machines can cut workpieces up to about 70 mm thick.
- Professional equipment cuts products about 140 mm thick.
Types of work
The scope of a circular saw depends on its size and type.
Manual circular saw
These electric circular saws are designed for making precise, straight cuts in thin lumber. Manual circular saw has small dimensions and is most often used for domestic work.
Small equipment for sawing wood is necessary for interior finishing of houses. Handheld circular saws are often used during repairs to cut laminate or wall finishing material.
Stationary circular saws are equipment for daily use. These professional machines can work on large quantities of wood in a day. They have a fairly large weight. more than 10 kilograms and high power up to 2500 watts.
Circular saws are mainly used in manufacturing plants for industrial purposes. The cost of such a device is quite high. Some small models of circular equipment also have a stationary use function. They can also be used successfully in private workshops.
HEALTH AND SAFETY REQUIREMENTS BEFORE STARTING WORK
2.1. Before starting work, you must wear overalls and safety shoes to protect against hazardous and harmful factors. Overalls must be of appropriate size, clean and not restricting movement. 2.2. Before starting work, wear personal protective equipment, check that it is in good condition and use it properly. 2.3. Before you start your work do the following. prepare the working place for work, for what purpose remove unnecessary things, free approaches to the circular saw, racks and stacks of wood, blanks;. turn on the general exchange supply and exhaust ventilation and local suction from the circular saw;. inspect visually check the general and local lighting, electric wiring, connection of non-current conducting machine parts to the protective earthing. Inspect the wood received for processing; to avoid injury, do not submit wood with defects (rottenness, rottenness, deep cuts, inclusions of foreign solid particles) for processing, as well as over-moistened and ice-covered wood and workpieces. 2.4. Before starting work, check that the cutting tools are in good condition and prepared for work. It is necessary to check sharpness of teeth of a saw; if on a disk the teeth are broken, there are cracks or other deformations, it is necessary to replace a disk. 2.5. A circular saw must not be allowed to be operated if at least one tooth is missing. 2.6. Teeth must be sharpened, have the same profile and height. 2.7. Before starting work check that the blade is securely fastened. 2.8. After checking the cutting tools, check that the machine is in good condition when idling, paying special attention to the condition of the drive belts: their strength, the tension of the belts, the correct position of the belts on the pulleys. 2.9. Check that the safety guards are in place and in good working order; do not allow the machine to be operated if its moving parts are not guarded. 2.10. All noticed malfunctions of the circular saw and violations of safety requirements during preparation for work must be reported to the work supervisor and must not be started until these have been eliminated.
3.1. When starting the circular saw, you must first make sure that there are no people in the machine’s operating area. 3.2. The object to be cut must be fed evenly into the saw, without jolts. 3.3. Care must be taken to keep nails and other metal objects out of the machine. 3.4. Do not hold long planks or blocks unattended when sawing. use support devices. 3.5. If the work is done by two persons, it must be coordinated with the auxiliary worker. 3.6. Do not saw glued boards, parts and products if the glue is not dry. 3.7. Circular sawing of workpieces must be performed in special templates with clamping devices. 3.8. Place hacked-off workpieces with the concave side facing down. 3.9. The saw blade must not be clamped in sharp turns of the cutting line. 3.10. If the saw blade is clamped, the workpiece must be pulled back and then let go again along the kerf. 3.11. Do not stand or let a helper or other person stand too close to your chain saw when it is in operation. 3.12. No sawing with gloves on to avoid gripping the workpiece and injuring your fingers. 3.13. Always be aware and keep your hands out of the danger zone. 3.14. Always keep a close eye on the circular saw at all times during operation, clearing sawdust from the sawdust in a timely manner. 3.15. Do not remove or install protective guards on moving machine parts while the machine is in operation. 3.16. It is forbidden to operate the circular saw without the safety guard. 3.17. Do not repair, lubricate, clean, or remove scraps or sawdust while the machine is running. 3.18. No measuring of workpieces or parts near the cutting tool of a running machine. 3.19. Workers must not pass or receive anything through the machine while it is in operation. 3.20. It is allowed to remove cuttings or sawdust from the machine only with special hooks, brushes, sweepers; it is forbidden to remove waste wood and garbage from the machine by hands. 3.21. Exercise extreme caution when working, and do not distract yourself from your work. 3.22. It is necessary to observe the following fire safety rules while working with the circular saw:. the machine must be cleaned from dust and sawdust at least once per shift;. local air exhausts must work while the machine is in operation;. large quantities of lumber, finished products, wood wastes, flammable liquids must not be stored.
Miniature machine made from washing machine motor
The circular saw is characterized by extreme simplicity and the availability of materials for its manufacture. Probably the only expensive part is the electric motor. Stationary machines are equipped with a powerful asynchronous motor, which provides cutting of thick wood of any species, but in a home workshop you can be limited to a smaller capacity.
Please note! For sawing boards of medium thickness it is enough to make a circular table with a drive from a washing machine motor with your own hands.
This design has several advantages. The motor from an old washing machine is inexpensive, moreover, such a unit is likely to be found in the household of a household handyman. Connecting this motor is not particularly difficult, there is no need to look for schemes, to engage in soldering. With all that, the power of such a machine is quite enough for most types of work.
The scheme of the machine can be simplified as much as possible, eliminating the belt drive. In this variant the cutting tool will be attached directly to the motor shaft. The base of the table mini machine is a frame made of 40 x 40 mm bars. If desired, it can be welded from a square or profiled tube.
Part of an old TV set would be perfect as a support (table top) for the circular saw. As practice shows, this part is characterized by sufficient strength, and thanks to the lacquer coating does not prevent the workpiece from sliding.
Make two parallel cuts in the worktop with the jigsaw perpendicular to the blade cutout. The sliding angle, which acts as a side stop, will slide over them. It will help to make a straight cut, if necessary, at a given angle.
Dangers of the circular saw
There are three main hazards that workers face when using a circular saw: handling characteristics, kickback, and flying particles.
Job specifics: injuries can occur if the operator’s hands slip during cutting or if they are too close to the blade during cutting. To prevent these injuries, make sure your hands are not in the cutting line.
Kickback: when the blade “catches” a piece of wood and throws it back toward the operator, this is called kickback. Kickback occurs if the blade height is incorrect or if the blade is not properly maintained. It also occurs more often in longitudinal cutting than in crosscutting. Kickback can also occur if precautions are not used or if poor quality wood is cut.
You can prevent kickback by following these tips:
- Use retainers to hold the wood in place.
- Use proper blade for cutting.
- Operate the saw at the manufacturer’s recommended speed.
- Keep the blade sharp.
Flying splinters of metal and wood: Working with a circular saw can cause wood chips, broken saw teeth, and splinters to be thrown away from the blade toward others. Help prevent particles from flying off by replacing saw blades with cracks.
Circular saws Main cause of injury. The circular saw blade touching the non-working or working part of the circular saw blade, sudden kicking of the workpiece.
Fig. 18. Circular saw: 1. adjustable top guard; 2. A device to start and stop the saw; 3. bottom protective casing; 4. cutting knife
The nonworking part of the blade must be equipped with a rigid and sturdy guard to prevent access to the teeth above and below the work table. It must not interfere with the removal of chips.
The working part of the saw, located above the frame, must be protected with a device that ensures that only the part of the saw necessary for the operation of the saw can protrude. The guard must be designed so that adjustment of the material to be sawed to height and return to the safety position can be done either automatically or manually in one operation.
The blade guard and its fixture must be made of strong and sufficiently rigid materials to ensure stability. The guard must be mounted in such a way that the blade cannot be touched and can be replaced without removing the guard.
A separating blade should be installed behind the saw blade to prevent deflection of the material being sawed. It must be set in the plane of the disc and be made of steel, breaking strength of which is at least 58 daN/mm 2 ; its lateral edges must be smooth and flat. It must be mounted in such a way that it cannot fall on the blade and must be exactly in the plane of the blade. To achieve this, the blade must be adjusted horizontally and vertically; this will allow the blade to adapt to the contour of the disc as closely as possible.
The thickness of the blade must be equal or less than the kerf width. Its edge must not be sharp and its top end must be strongly rounded.
The width of the strong portion of the separating blade at table level must be at least one-fifth of the maximum blade diameter allowed for the saw.
This minimum width must be maintained up to the level of the fence when it is supported on the blade.
The height of the blade must be at least as high as the maximum height of the blade above the work table.
Various safety precautions must be taken when preparing and carrying out the work; the peripheral speed of the blade must be high enough not to cause vibration of the material being sawed; the sawyer must stand slightly away from the area of possible impact; blades must be perfectly flat, well sharpened and set; the type of teeth must be determined according to the material being sawed; without any exceptions, any material other than wood or similar must not be sawn; when sawing long.