What are the main parts of the jigsaw?
What are the main parts of a jigsaw?
The art of sheet metal working has been known since ancient times. In many museums of the world, metal works of the masters of the ancient world and the Middle Ages are preserved. Since ancient times artistic work with metal was widespread in our country as well. First of all, it is necessary to name the Scythian art of artistic processing of metal, belonging to VII-IV centuries. B.C.э. The most simple is the technique of the broached metal (Other names of this art: chiseled chasuble, chiseled iron). In ancient times, sawn metal was used to upholster wooden chests, boxes, and trunks. Pierced iron was used for decorating roof overhangs, chimneys, and crowning chimneys. Weathervane, candlesticks and keyholes.
In order to increase the expressiveness of the kerf metal, it was sometimes covered with a coloured fabric background, usually red Sometimes this background was covered with transparent plates of mica on top, on which the metal pattern was already fixed. Such decor is used, for example, Russian craftsmen in the manufacture of massive doors of the Assumption Cathedral in Rostov Veliky.
Copper, brass, bronze, aluminum, or tinplate steel sheets are used for the production of artistic articles in the technique of piercing metal.
Work begins with straightening the prepared workpiece from a sheet metal (you mastered straightening techniques in the 5th grade). Then mark out the drawing. To do this, copy paper is placed on the workpiece, and the drawing of the composition is placed on top. Use a hard pencil or ballpoint pen without paste to draw on the plate. To prevent the traces of the copier pattern from crumbling, they are carefully covered with transparent varnish. For more reliable marking the obtained lines slightly trace around with a scribe.
When sawing closed contours in the metal pre-drill (drill) holes. If the size of the outlines is small, they are filed (expanded) to the required size with nail files. To saw out contours of complex shape and greater lengths use jigsaw.
The locksmith’s jigsaw is a lightweight saw with a fine-tipped file. Teeth of jigsaws are directed to the handle, so saw from top downwards if the plate lies horizontally. The techniques for working with this jigsaw are similar to those for sawing plywood products (you learned these techniques in the 5th grade). When sawing contours in sheet metal, a sawing table is also used. The workpiece must be held in place with your free hand to prevent it from jumping when working. Always begin sawing not with the outer contour, but with the inner elements of the pattern.
When sawing very thin metal, thinner than 1 mm, it is better to put it between two plywood boards, fastening them together in the corners, and saw all together.
After all the contours are sawed out, sharp edges are deburred (files or files) and the surface of the article is ground first with a coarse and then with a fine-grained emery cloth. To get a mirror shine, the surface is wiped with a piece of felt or cloth Use abrasive paste (e.g., with GOI paste).
the ground and polished metal surface can be coated with stable chemical compounds that form films on the metal, painted in different colors (this work is done only by the teacher). Finish the work by varnishing the surface.
The finished pattern is mounted on the product (e.g., a casket) with small nails, which can also serve as additional decorative elements. To increase the decorative expressiveness of the design, a colored background can be placed beneath it.
When marking the workpiece, do not tuck the scriber into a coat
Use files, jigsaws with handles that are securely fastened and in good working order.
Securely fasten the sawing table to the workbench. Do not jiggle the jigsaw suddenly when sawing and do not lean over the workpiece
Making products in the kerf metal technique
Think over what kind of a product you would like to make (a key-ring, an emblem-cover on an album, decorative elements on leather or textile products, overlays on keyholes, etc.).). Choose a suitable pattern from books and magazines or draw it yourself.
Prepare a sheet of metal (copper, brass, aluminum, steel) for work.
Transfer on a workpiece by means of a tracing paper the contours of figure.
Consider the markings. Identify and mark the locations of drill holes.
Finish the inner and outer contours using appropriate tools.
Sand the workpiece with emery boards and emery cloth.
Lacquer the piece you are making.
New terms: Sawing metal (chiseled metal, chiseled iron), jigsaw, abrasive paste (GOI paste).
Where were and are artwork made of sawn metal??
Name the sequence of work when making products in the sawing technique.
What are the main parts of a jigsaw??
How do you saw out of very thin metal??
What tools are used for grinding, sanding and polishing?
How to choose and use a hand jigsaw SamStroy
How to use a hand jigsaw?
Working with a hand jigsaw, even of minimum dimensions, is a laborious and tedious task. In the previous section there is no accidental mention about the shape of the handle. all the manufacturers have long ago worked out the most ergonomic form for the jigsaw handle. Nevertheless, your hands still get tired. In order to make it happen as late as possible, it is necessary to adhere to the following recommendations:
- A manual jigsaw, or rather its exchangeable blades, are not designed for making saws at an angle. If necessary, shape sawing is interrupted and continued on the opposite side. Of course, for this, a mark must first be made at the point where the saw’s length deviates by more than 5 10° from the horizontal/vertical plane.
- To save strength, especially for shape sawing, it is recommended to use the maximum saw’s span: this not only increases the speed of cutting, but also improves conditions for chip removal. This is especially important when working with
Controlling test tasks on the section “Woodworking”, 5th grade
Quizzes are designed to test students’ knowledge of the “Woodworking”, 5th grade. For use in the work proposed test option and the answer key to each question.
View content of the document “Control tests on the section “Woodworking”, 5th grade
FINAL TESTS ON TECHNOLOGY.
SECTION-Woodworking (5th grade)
What is the occupation of the worker engaged in manual woodworking called?
What is the equipment of the working place for woodwork??
□ b) technologies for the construction of medical instruments;
c) technologies for converting materials, energy, information;
□ d) technology for building airplanes and spacecraft.
Which type of wood is not coniferous??
Which type of lumber is called lumber??
□ a) sawn lumber up to 100 mm thick and wider than double thickness;
□ b) lumber that is more than 100 mm thick and wide;
c) the sides of the log left over after sawing.
□ a) pressed sheets of steamed and shredded wood to the finest fibers;
b) plates made by pressing sawdust, shavings, and wood dust;
c) thin layers of wood obtained by planing or peeling.
□ a) lumber less than 100 mm thick and less than double length in width;
□ b) lumber consisting of three or more layers of veneer;
c) lumber obtained by sawing a log in half lengthwise.
□ a) a graphical depiction by hand, indicating the dimensions and compliance
□ b) the graphical representation made by drawing with the help of drafting tools
□ c) a three-dimensional hand-drawn image.
The outline of the workpiece in the drawings:
□ a) drawing lines and dots on the workpiece to indicate places of machining;
□ b) Drawing additional, auxiliary lines when making a product;
c) marking points on the workpiece to draw lines; □ c) marking points on the workpiece to draw lines; d) marking points on the workpiece to draw lines.
Which edge is called the reference edge?
□ b) serving as the basis for further marking;
Which of the following tools are used when marking wood details?
□ a) the formation of sawdust during the sawing process;
□ b) cutting the wood into pieces with a saw;
What is the difference between longitudinal and crosscut saws?
□ a) the joinery operation of cutting thin layers of wood from the surface of a workpiece;
c) breaking up a workpiece into pieces to form shavings.
Smooth and even surfaces of the parts made of wood are obtained with the help of:
Which tools are used for drilling?
Which hole is called a through hole??
□ a) through the entire part;
What are the main parts of a nail holder?
What tool is used for nailing?
What natural adhesives are used for workshop work?
What kind of tool is used for stripping wood parts?
How to replace the file holder on a jigsaw
If the saw holder has failed on the tool, it is not necessary to change the entire rod and saw holder assembly to do so. The file holder can be replaced individually, since it is attached to the rod by means of one or more threaded connectors. For ease of manipulation, it is recommended to dismantle the rod assembly. Disconnect the faulty sawtooth holder from it, and install a new one in its place.
Jigsaws are classified into radial, lateral and frontal, depending on the manufacturer. The easiest models are the radial type, with the replacement of which there are no problems. Lateral and frontal ones are another matter. They are practically impossible to find on sale. Usually you need to order them from the manufacturer in order to fix the breakage of the saw holders. You can try to rebuild them using special repair kits. If you can not fix the breakage and find a new part, you should buy a complete stem.
Lesson Planning in Grade 7 “Chasing
We pay your attention that according to the Federal law N 273-FZ “About education in the Russian Federation” in the organizations which are carrying out educational activity, training and education of students with HIA both together with other students, and in separate classes or groups is organized.
Objective: to get to know embossing as a method of artistic metalwork.
A face-to-face quiz on the previous topic.
Where sawn metal artwork was and is used?
Name the sequence of work in the manufacture of products in the technique of metal punching.
What are the basic components of a bench-mounted jigsaw??
How to carve products from very thin metal?
What tools are used for grinding, polishing and buffing the surface of the workpiece??
Embossing is a method of artistic processing of metal, which causes a shallow relief on the workpiece by strongly pressing with a tool that has ledges. Embossing can be flat-textured, embossed, and three-dimensional.
Embossing has been known since Ancient Egypt, Ancient Greece and Rome. Embossing reached its peak in Old Russian art between the 15th and 17th centuries. At present time, embossed panels are well included into the decoration of interiors in public buildings, subway stations, etc. д.
Embossing is made on sheet metal with thickness of 0.3 1.5 mm. Copper, brass, aluminum, and soft annealed steel sheets are most commonly used. For some simple decorative items can be used sheet roofing steel (roofing iron).
In the past, precious metals such as gold, silver, and their alloys were used for embossing jewelry and church utensils.
The main tools for stamping are coining tools, which are steel rods of special form and a length of 120 170 mm. Some of these are shown in Fig. 92. The contour of the drawing is reproduced on the metal with the help of a consumable, outlining it in the form of a more or less clear continuous line. Flatshakers are used for smoothing flat surfaces and bobbers for making a semicircular shape when chasing.
They are held with three fingers in the left hand, leaning on the ring finger (the little finger is enough). The elbow should be weighted to allow the arm to move freely. The chaser is not held strictly vertically, and slightly inclined backwards, so that its working surface (fight) was raised obliquely and as a result of this at a blow of the hammer constantly moved forward. In the right hand they hold a hammer and lightly tap the chaser with it while moving it forward.
When hammering out large, deep reliefs or smoothing out backgrounds, they use wooden chasers
They are made of hard wood such as hornbeam, beech, and oak. The combat part of the wooden plaque is carefully smoothed with a file with a fine notch, and then processed with a sandpaper.
Of all the varieties of flat-relief embossing, the most expressive and easiest to produce is the flats with a lowered background. It is performed in several stages.
At the first stage on a sheet of paper performs drawing in full size, without shadows with clean margins (30 40 mm) on each side for gluing it to the metal (Fig. 94, а).
The second stage is the preparation of the metal plate. It is cut out with metal scissors so that the whole drawing can be placed freely on it with a small free edge (field) of 25 40 mm wide. These fields will be needed if necessary to clarify the pattern or to bend (turn back) the edges. These fields are taken with tongs when annealing the plate.
The cut off piece is placed on the straightened plate and smoothed out by light blows with a mallet. Sometimes a flat board is placed on a sheet of especially soft metal, and a hammer is struck on it.
In the third step, the image of the pattern is transferred to the metal plate. To do this, use a brush or cotton swab to cover the surface with watercolor whitewash or light ink, which is added a little carpenter’s glue. After the paint dries, put a tracing paper on it, and on top of the drawing, the edges of which are glued to the metal or attached with ordinary paper clips. The drawing is traced with a ballpoint pen with a stem without paste. In order that the finished drawing on the metal did not rub off when working, it is covered with nitrolac.
At the following step perform the flow-out of the drawing. To do this, a sheet of workpiece is placed on a sheet of dense rubber and stamped with a punch-pusher to trace the contours of the figure with a continuous line. All turns, bends of the contour pass with more frequent strokes and a large slope of the embossing inside the rounding. After flowing, the pattern becomes clearly visible on both the front and back sides.
The fifth step is lowering the background around the drawing with the help of tracers. This work can be done on a metal plate. The traces of the flap marks outline the outlines of the drawing. The pattern begins to emerge clearly, rising slightly above the besieged background.
If the drawing is not complicated and does not require refinement (lifting) relief, proceed to the alignment of all areas of the background so that they lie in one plane. This is achieved by tapping them with the tracer on the steel plate, especially near the borders of the convex areas of the pattern.
If further work with the relief is provided, then before it is necessary to perform heat treatment of the workpiece. The thing is that for the time of outlining the contours and lowering the background the metal plate after numerous hammering has become taut, i.e. brittle, has lost its plasticity. Anneal the plate to restore its plasticity. This step of making the product is done by the teacher. When annealing copper, brass, roofing steel, the plate is heated (in the school yard) to a dark red color using a blowtorch or a gas torch. The cooled plate is covered with a dark coating. scale. To remove it, the metal surface is washed in 1015% solutions of acids, hydrochloric and sulfuric (this is only what the teacher does). The brightened plate is washed with water and dried.
The aluminum plate may not be annealed.
The next stage (if the pattern calls for it) is raising the embossing. The embossing is hammered out with a chisel bob from the back side of the plate on a rubber pad. It is important that the metal is stretched elastically and doesn’t tear.
The finished embossed item is sanded with emery cloth if necessary and polished with abrasive GOI paste (convex areas).
The next stage is the color decorative finishing (patination) of the product. The “non-chemical” methods of patination are the most convenient. Colored protective films on steel products can be obtained by heating the metal on an electric stove with a closed spiral. A massive (5 to 8 mm thick) metal plate is placed on the tile disc, and the ready embossed product is placed on top of it.
As the product heats up, it will be covered with beautiful and clean color films. First a light yellow color (220 0 C) appears, then a yellow color (230 0 C) and so on. д. (see the drawing below). the colors of the tarnish in Tab. 4). The colors change from one to another gradually. It is possible to stop at any shade, it is enough to remove the product from the tile.
The surface of the chased plate keeps its shine for a long time if it is varnished. The lacquer is applied with a brush in an even and thin layer.
Finished embossed decorative plates can be mounted on specially prepared wooden substrates.
Handle the workpieces carefully, because sheet metal has sharp edges.
Do not keep your left hand close to the scissors when cutting the metal plate, so your fingers do not get caught by the blade.
Straighten sheet metal with a good block hammer.
Carry out embossing with a hammer with a securely hooked handle.
Make metal embossing reliefs
Choose the product you would like to make (a license plate for an apartment, a garden patch or a training workshop workstation, ornamental elements for decorating stands with learning aids, metal pads for hooks, hangers, a decorative plate for a casket, etc.).).
Cut out and flatten a sheet metal blank to the desired size.
Transfer drawing on a metal surface.
Finish flowing (tracing the outline of the design) with a punching tool.
Lower the background of the design with the embossing tool.
Align the background so that it all touches the same plane.
The teacher points out the best executed works, draws attention to the characteristic flaws.
Theme of the lesson: cutting metal with a hand hacksaw
1 Master of the Kerch Technological College Moiseenko A.М. Presentation Subject of the lesson: cutting of metal with a hand hacksaw The purpose of the lesson: to learn the initial (primary) skills of working with a hand hacksaw, the ability to install the hacksaw blade into the frame of the hacksaw machine.
2 A student must know: assignments and methods of operations while cutting metal with a hand hacksaw, electric hacksaw; rules of workplace organization and work safety; tools and equipment used while cutting. The student must be able to: cut strip material, as well as square, round and rectangular sections without marking and the risks, correctly install a hacksaw blade in the machine, correctly perform the methods of work and workplace organization, comply with labor safety requirements.
3 CUTTING METAL WITH A HAND-HELD METAL-SAWING HACKSAW UPDATE OF THE BACKGROUND KNOWLEDGE
4 DEFINITION Cutting with a hacksaw is a locksmith operation to separate parts (workpieces) from a bar or sheet metal with the removal of chips.
5 What is called a section rolled metal product??
6 Bar products are rolled into semi-finished steel products that are further processed into finished products (high-quality bars, semi-finished steel, galvanized steel, and other long products)
7 How are sections subdivided into long products?? Where are the different profiles of rolled products used??
8 Long products are used as blanks for the manufacture of various parts in engineering, machine tools, construction, etc.д. There are the following sections: simple (circle, square, hexagon, strip, sheet), shaped (rail, beam, channel, T-beam, etc.), flat rolled product.), special
9 What is the basis of any cutting tool? What is a cutter of a hacksaw?? What are the teeth on the hacksaw blades for?
10 At the heart of any cutting tool is the CLINE. A carpenter’s hacksaw blade is called a DOG. Teeth are set on the hacksaw blade to prevent the blade from jamming in the kerf to reduce friction when sawing against the walls of the kerf.
11 Machine tool construction For cutting thick sheet, strip, round and profiled metal, as well as for cutting grooves, slots in the heads of screws, trimming the workpiece on the contour (with the allowance for processing) is used manual metal-sawing machine. Cutting metal with a hand held hacksaw is the most common locksmith operation. A handheld hacksaw consists of two main parts: the hacksaw frame and the hacksaw blade. a Manual metalcutting hacksaws: a with one-piece machine; b universal metalcutting hacksaw with sliding machine: 1 shank with handle; 2 frame (machine); 3 frame extension device (cage); 4 tensioning screw; 5 wing nut; 6 hacksaw blade; 7. б
12 Blade design Hacksaw blade is a thin, narrow steel plate with teeth on one or two ribs made of P9, P18, X6VF tool steel. The thickness of the webbing is 0,65 and 0,8 mm. To reduce friction, the teeth of the blade (during fabrication) are separated by 0,25-0,5 mm. When sawing the blade is lubricated with machine oil to decrease friction. Hacksaw blade is secured to the frame with pins. Tension the blade and screw the nut on the tensioning screw without applying too much force. the screwdriver, without using pliers, vice grips or other tools. Hacksaw teeth must be turned toward the tensioning screw, i.e.е. to the side opposite to the handle. The tension of the blade must not be too high or too low as this could cause a breakage of the blade
13 NEW MATERIAL DESCRIPTION ” Cutting Metal with a Hand Hoeing Saw
14 Exercise 1 Working position and grip When cutting workpieces, clamp them firmly in a vice and make a small cut with a three-edged file at the place of cutting, so the blade does not slip on the surface. place the place of the cut as close as possible to the vice, approximately mm away from the edge of the vice jaws. When cutting with the hacksaw stand upright, freely and steadily at a half turn in relation to the vice jaws. Left (supporting) foot must be forward. correct working posture and grip of the tool promotes high productivity with less fatigue.
15 Exercise 2 Cutting technology When working, the hacksaw must be held straight with both hands, i.e.е. perpendicular to the jaws of the vice so as not to make an oblique cut. The hacksaw can only be moved by hand and the body remains stationary. This saves strength and ensures high quality of work. Move the hacksaw smoothly, without jerks and with such a swivel range that all teeth of the blade are used in the cut. The wear on the blade will then be even along its whole length and the blade will last longer. Only press the workpiece with a forward motion, t. е. during the working stroke. During the reverse stroke (idle) the hacksaw should be slightly lifted so that the teeth of the blade do not become blunt. While cutting the hacksaw should make double (working plus idle) strokes per minute (0,5-1.0 strokes per second).
16 Exercise 3 Cutting strip and square steel The inclination of the blade is permitted from the plane to the edge of the workpiece. Do not start cutting with a sharp edge. At the beginning of cutting strip and square steel the hacksaw is tilted slightly forward. Gradually the inclination is lowered and after the cut has reached the closest edge of the workpiece the hacksaw is returned to horizontal position. Strip material can only be cut if three or more teeth of the hacksaw blade can be placed on its thickness.
17 Exercise 4 Cutting long blanks When cutting long blanks it is not always possible to complete the cut because the frame of the machine tool rests against the end of the workpiece. Then turn the blade in relation to the frame by 90°⁰ and continue cutting.
18 Exercise 5 Cutting thin material clamped between wooden planks. Such workpieces are assembled in bundles, t.е. several workpieces stacked together and clamped in a vice.
19 Cutting square and hexagonal workpieces Exercise 6 a Start cutting; b Cutting process
20 Methods of cutting circular workpieces Exercise 7 a Start cutting; b Cutting process
21 Exercise 8 How to cut a pipe Choose a blade with a fine tooth for cutting pipe. To avoid crushing it is clamped in spacers. Make a cut with a triangular file according to the cut line and start cutting. The cutting tempo should be strokes per minute with very little pressure on the hacksaw. after sawing the tube wall thickness the blade is turned away from itself and continues sawing by combining turning of the tube with cutting along the tube circumference.
22 Cutting slots and grooves with a slotting machine Exercise 9
23 Possible cutting faults with a hacksaw 1. Incorrect clamping, poor blade tension and high blade pressure when sawing produce an oblique cut and can break the blade. 2. Incorrect marking or inattention will not obtain the correct dimensions after cutting a workpiece. 3. Improper clamping of the workpiece in a vice (without jaws or spacers) damages the surface of the workpiece.
24 Observe the general rules when cutting 1. The blade must be well taut. 2. The workpiece must be firmly clamped. 3. Cut evenly without jerks. 4. You must be very careful when cutting with a new blade in an unfinished kerf (jamming and blade breakage could occur). 5. Use the full length of the blade when cutting. 6. When cutting workpieces with ribs and sharp edges, remember the following rule: Always cut from flat to rib to avoid chipping the blade teeth. 7. To avoid damaging the workpiece with the hardened jaws of the vice, it is necessary to use the jaws.
25 Safety at work when cutting metal with a hacksaw. 1. Work only with a hacksaw with a correctly adjusted blade, properly mounted and tensioned. 2. Hacksaw handle must be firmly seated, have a safety ring and be free of cracks. 3. Do not use nails and screws instead of pins to fasten the hacksaw blade. 4. Do not work with a hacksaw blade that has painted teeth. 5. Support the part of the workpiece to be cut so that it does not fall off and injure your legs. 6. Protect your hands from being cut by the teeth of the blade and the sharp edges of the workpiece. Lay the hacksaw on the workbench with the blade facing away from you or insert it in a vertical stack with the blade facing downward. 7. Remove sawdust at the end of work with a brush and dustpan. Never blow sawdust off (it could get into the eyes) and never remove it with your bare hands. REMEMBER! CUTTING WORKPIECES WITH RIBS AND SHARP EDGES
26 Reference questions 1. What are the main parts of a hacksaw?? 2. Why make a hacksaw with a sliding hacksaw?? 3. What is a hacksaw blade?? 4. How the hacksaw blade is clamped in the hacksaw machine? 5. why and how the teeth of a hacksaw blade are set? 6. How to mount the hacksaw blade in the hacksaw machine? 7. Why the hacksaw blade must be tight enough in the machine? 8. Why is the hacksaw blade set with the teeth facing the opposite side of the handle?? 9. How do you clamp the workpiece when you cut it with the hacksaw?? 10. How to hold the hacksaw when cutting? 11. What stroke of the hacksaw is called a working stroke?? 12. When the hacksaw blade is turned at right angles to the hacksaw machine? 13. How to cut workpieces with ribs or sharp edges?
27 quizzes Test your knowledge of hacksaw 1. A hacksaw is made as a sliding hacksaw so that: a it can be conveniently stored; b. it was easy to store and transport; c it was easy to assemble and disassemble; d it was possible to fix a blade of different length into the hacksaw. 2. The web in the machine can be turned: a by 90 degrees; b by 180 degrees; c by 45 degrees; in reverse. 3. Teeth of the blade (during fabrication) are set at: a 0,65 mm; b.1-2 thickness of the blade; c 0,25 0,5 mm; d 0,25 0,5 cm.
28 Continued. 4. The blade is lubricated with machine oil: a to prevent rust; b to make it easy to store; c to reduce friction; d they are covered with paper. 5. The teeth of the blade are chipped: a if not sawing the entire length of the blade; b if sawing from rib to plane; c if not sawing evenly; d if sawing with a poorly tensioned blade. 6. When sawing, you get an oblique cut if: a) you press the blade too hard; b) you do not clamp the workpiece in a vice; c) you mark the workpiece incorrectly; d) you are inattentive.
29 Continued. 7. Set dimensions are not obtained after cutting the workpiece if: a) the blade is pressed too hard; b) the workpiece is not correctly clamped in a vice; c) the blade is not correctly clamped; d) the workpiece is not cut properly. inattention or incorrect marking. 8. The surface of the workpiece is damaged if: a) the blade is pressed hard; b. workpiece in a vise; c inattention and improper clamping of the blade; d. Inattention or faulty marking. 9. Normal sawing speed: a double (working plus idle) strokes of the hacksaw per hour; b double (working plus idle) strokes of the hacksaw per minute; c 0.5-1 double (working plus idle) strokes of the hacksaw per second; d double (working plus idle) strokes of the hacksaw per minute.
30 continuation. 10. During idle running the hacksaw is lifted slightly so that: a) the teeth of the blade don’t break; b) the teeth of the blade don’t get blunt; c) the sawing speed increases; d) the user gets tired less.
31 Work mechanics Fig Mechanical hacksaw: 1. drum; 2. body; 3. pin; 4. slide; 5. bracket; b- hacksaw blade
32 Mechanized work Fig Stationary mechanized hacksaw: 1. frame; 2. table; 3. vise; 4. frame; 5. trunk; 6. cooling system nozzle; 7. electric motor; 8. interchangeable nozzles
33 Mechanization of works Fig. Universal circular saw; 1. electric motor; 2, 4,5,9. handles; 3. arm; b- vertical column; 7- bed; 8. cutting disc
34 Mechanization of Work Rhys Pendulum saw: 1. frame; 2. table; 3. cutting disc; 4. crank; 5. pulley; 6. swinging trunk; 7. bracket; 8. support bar
Technology tests for boys in grades 5-6.
Tests for technology lessons in grades 5-6 for boys:
Equipment of the workplace for manual woodworking
b) for supporting long workpieces when planing;
b- for convenient fixation of drawings and sketches;
b) technology for making medical tools;
c) technologies for converting materials, energy, information;
d- airplane and spacecraft construction technologies.
Wood. natural construction material. Lumber and wood-based materials
ALL ABOUT JIGSAW / WHAT IS A JIGSAW / HOW TO USE / JIGSAW PARTS / JIGSAW BLADES / TIPS AND TRICKS
(a) Lumber up to a thickness of 100 mm and a width of more than double thickness;
b) lumber with thickness and width over 100 mm;
(a) Pressed sheets of steamed and pulverized wood;
b) sheets obtained by pressing sawdust, shavings and wood dust;
a) lumber less than 100 mm thick and less than double the length;
b) sawn wood consisting of three or more layers of tinned veneer;
c) sawn timber obtained by sawing a log lengthwise in half.
A graphic depiction of the wood parts. The stages of work planning for the fabrication of a product
a) graphic image made by hand with the indication of dimensions and observance of proportions by eye;
b) a graphic representation made according to the rules of drawing with the help of drawing tools;
c) a three-dimensional image made by hand.
c) a dashed line with two dots;
a) determine which lines are used to make the drawing
b) determine the name, scale, number of views, size, shape and material;
c) define the procedure for making a part.
a) sequence of operations, graphical representation of the tools used, and fixtures;
b) the system which determines the order and terms of making a product;
c) part of the production process for turning a preparation into a part.
(a) drawing lines and points on the workpiece to indicate the machining points;
b) drawing additional, auxiliary lines when making the product;
c) drawing points on a workpiece to draw lines
a) to draw lines and marks parallel to the edge of the workpiece;
b) for measuring angles from a sample and transferring them to the workpiece;
c) to draw circular arcs and transfer dimensions;
b) serving as the basis for further markings;
(a) Sawdust formation during the sawing process;
b) cutting the wood into pieces with a saw;
a) fixtures for marking lines at an angle of 45° and 90°;
b) a device for sawing workpieces at an angle of 45 and 90°;
In which direction do the teeth of a longitudinal saw have an inclination?
a) carpentry operation of cutting thin layers of wood from the surface of the workpiece;
c) dividing the workpiece into parts with the formation of chips.
c) on the workbench cover with the blade to the side.
a) passing through the whole workpiece through;
c) to remove the cut chips from the hole.
a) passing through the entire workpiece through;
c) for taking the cut chips out of the hole.
a) the length of the nail must be 2-3 times the thickness of the nailed part;
b) the length of the nail must be twice the thickness of the nailed parts;
c) the length of the nail must be 2-3 times less than the thickness of nailed parts.
a) hammer a nail at least 4 diameters from the edge and at least 15 diameters from the end;
b) drive a nail at least 2 diameters from the edge and at least 10 diameters from the end;
c) hammer the nail at a distance of 10 diameters from the edge and 15 diameters from the end.
Connecting parts with screws. Gluing wood products
a) length should be 2-3 times the thickness of the thinner connected part;
b) the screw must go through the main (thicker) plate;
c) the screw must be twice the thickness of the main part.
a) make an indentation with an awl, drill a hole 1/2 the diameter of the screw;
b) a hole with a diameter greater than the screw diameter is drilled in a thin part, and a hole with a diameter greater than the screw diameter is drilled in a thick part. blind hole with a diameter of 4/5 of the diameter of the screw;
c) drill a through hole in parts 2/3 of the diameter of the screw.
(a) A viscous substance that, when hardened, forms a strong film that connects surfaces;
b) a film-forming substance which, when dry, forms a hard, transparent film;
The first jigsaws were invented in the mid-16th century.
At that time had a primitive construction, consisting of U or U-shaped frame, working blade.
There was a serious drawback. to work with any material, you had to adjust the tension manually, which complicated the sawing process.
In modern manual models, the configuration has not changed, but elements responsible for the tensioning of the saw have been added (the first clamping mechanism was patented in 1876).
The jigsaw is a tool for shape or precision cutting in wood or other materials. It is used to cut wood, metal, ceramic, and composite materials of various complexity. Consists of metal frame with fastening clamping system, handle and working blade. saw blade with teeth of different length and size. The cutting blade moves in one direction only, you must turn the workpiece or the saw blade to change the cutting plane.
Important! The jigsaw has some limitations in the work. With its help, it is difficult to make straight, even straight saws, cut off part of the workpiece at an angle of 90 o without a special guiding plane.
“FSES exam tests for students of remedial schools in carpentry for the first level” Author Tamakaev Robert Yakhyaevich.
Answer the question by ticking the checkboxes below.
Working professions, the workplace and lumber.
Q What is the occupation of the handicraftsman?
Question What kind of woodworking workplace is equipped with?
Question What is not used for clamping workpieces on a workbench?
Question Which method is used to make a tangential cut in a tree??
в) □ parallel to the core at some distance away.
Question Which of the following types of wood is not coniferous?
Question Which type of lumber is called a beam?
а) □ lumber up to a thickness of 100 mm and a width of more than double thickness;
б) □ lumber with a thickness and width of more than 100 mm;
в) The side parts of a log left over after it is sawn.
а) □ pressed sheets of steamed and shredded wood to the finest fibers;
б) □ sheets obtained by pressing sawdust, shavings and wood dust;
в) □ a thin layer of wood obtained by planing or peeling.
Theme: “The graphic representation of wood details. stages of production”.
а) □ A graphic depiction made by hand with dimensions and proportions by eye;
б) a □ a graphical representation made according to the rules of drawing with the help of drawing instruments;
в) □ a three-dimensional image made by hand.
Q What does the flowsheet say about?
а) □ sequences of operations, graphic illustration
The tools and devices to be used;
б) □ a system that determines the order and timing of the product;
в) Part of the sawing process in turning a workpiece into a workpiece.
а) □ Drawing lines and dots on the workpiece to indicate where to work;
б) drawing of supplementary, auxiliary lines on the workpiece;
в) □ Drawing points on the workpiece to draw lines
Question Which tool is used for marking and measuring
а) a) The squaring bar; b) The crow bar; c) The crow bar; d) The cabinetmaker.
Question 3. What is a thickness gauge used for??
а) □ to draw lines and marks parallel to the edge of the workpiece;
б) □ to measure angles from a pattern and transfer them to the workpiece;
в) □ to draw circular arcs and transfer dimensions;
Question 4. Which edge is called the reference edge??
б) □ serving as the basis for further markings;
Question 5. Which of the following tools are used when marking out wood parts?
а) □ the formation of sawdust during the sawing process;
б) □ cutting wood into pieces with a saw;
Which saw is called a beam saw??
а) □ Carpentry saws with a tensioned blade;
Question What is the difference between longitudinal and crosscut saws?
в) saw with a non-tensioned, rigid blade.
а) □ fixtures for marking lines at 45° and 90°;
б) □ A tool for sawing workpieces at 45° and 90°;
в) □ an attachment for securing a workpiece to a workbench,
а) □ The carpentry operation of cutting thin layers of wood from the surface of a workpiece;
в) □ splitting the workpiece into parts to form a chip.
Q What is a planer for roughing wood??
Question 3. Which tool is used for drilling??
Question Which hole is called a through hole??
а) □ A nail that goes all the way through the workpiece;
б) □ made to a certain depth;
What are the different types of drill bits used for drilling in wood??
Question 6. What are the main parts of a nail??
Question 7. What are the main parts of a nail??
Subject: “Joining parts with screws. Gluing of woodwork.
Q Which fasteners are used to join products made of
Question 9. Which rule should be observed when selecting the length of a screw?
а) □ Length should be 2-3 times the thickness of the thinner
б) □ The screw must go through the main (thicker) part;
в) the screw must be twice as thick as the base part; □ the screw must be twice as thick as the base part; □ the screw must be twice as thick as the base part.
а) □ a viscous substance that, when hardened, forms a strong
б) □ a film-forming substance that forms a hard, transparent film when dry;
в) □ a solution of synthetic substances used to glue wood.
Topic: “Deburring the surface of a workpiece. Burnout on wood”.
Question 1. Which tool is used for sanding wooden parts??
question 2. Which files are used for scraping??
а) A device for sawing material in curves;
б) □ Type of saw to separate the workpieces into parts;
в) □ A holding device for plywood workpieces.
Question 4. What are the main parts of a jigsaw??
в) □ frame, handle, upper and lower clamping screw.
Question Which fixture is used when sawing with the jigsaw??
Question What are wood finishes?
а) □ to improve its mechanical properties;
б) □ to prevent the penetration of moisture;
Question 7. What kind of finish is called transparent?
в) by adding a □-carving to the surface of the product.
Question 8. What is the application of a transparent finish?
Question 9. What is a stain used for??
а) □ for dyeing the wood in the color of the sea;
б) □ for staining in other wood colors;
в) □ to change the mechanical properties of wood.
Question 0. Which type of finish is called opaque?
в) □ with threading on the surface of the product.
Execution key to the exam test tasks
Views: 53 Downloads: 14
If you are the author of this work and would like to edit or delete it from the site. please contact us.