The angle of inclination of the saw when cutting plywood

Presentation: Operations and techniques for sawing wood in the manufacture of products.

For preschoolers and pupils of grades 1-11

Record low registration fee 25 R.

angle, inclination, cutting, plywood

Description of the presentation for individual slides:

Operations and techniques for sawing wood in the manufacture of products Manufactured by: Karkin Yu.V.

Sawing is one of the most important and responsible woodworking operations. By doing it correctly, we improve the quality of the part, reduce the allowance for cleaning and planing, reduce the time it takes to manufacture the part, and save wood. Sawing is the process of cutting wood into pieces to form a saw cut. Cut. the gap formed by the hacksaw during the cutting process.

Hand saws are divided into tensioned with a thin saw blade and loose with a loose, thicker blade. Stretched saws include all bow saws, and saws with a free blade include hacksaws.

Sawing of wood is carried out with various saws.

In the direction of cutting the fibers, there are transverse, longitudinal and mixed sawing. When cross-cutting, the direction of cut is perpendicular to the fibers, when longitudinal sawing. parallel to the fibers, with mixed sawing. directed at an angle to them.

For transverse sawing of workpieces, saws are used, in which the teeth have a straight triangular profile, and for longitudinal sawing, saws with an inclined tooth profile.

Setting and sharpening saws

When cutting workpieces, special attention is paid to their reliable fastening. When cutting a cut, a bar is used, which is firmly held with the left hand so that the end of the bar is aligned with the cutting line.

For precise sawing of workpieces across the fibers at different angles, a miter box is used, a device consisting of a base and two bars in which cuts are made for sawing at an angle of 30 °, 45 °, 90 °. For the convenience of work, the miter box can be fixed in the workbench clamps. When sawing in a miter box, the workpiece is pressed against the side bar with the thumb of the left hand and make sure that the marking line on the workpiece is opposite the cut.

Sawing Safety 1. The workpiece must be securely fastened. 2. Observe the correct working posture. 3. It is necessary to work with a hacksaw without jerking or bending the blade. 4.Do not guide the saw blade with your finger. Use a stop or a block for these purposes. 5.Do not keep your left hand close to the saw blade. 6.Clean shavings from the workbench with a broom. 7. The angle of inclination of the saw when sawing wood. 45 °, plywood. 15 °.

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March 2. 4, 2021 19:00 (MSK)

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§ 8. Sawing wood blanks

How to cut the workpiece correctly to obtain the required part dimensions? To do this, you need to study the sawing technology.

Various hand saws are used to cut wood blanks (fig. 23).

Fig. 23. Tools for sawing: a. bow saw; b. joiner’s hacksaw; c. circular saw

Bow saws usually have fine teeth, and hacksaws have large ones. The finer the saw teeth, the less roughness of the cut of the workpiece. cut.

Fig. 24. Saw teeth for cross cutting: a. the shape of the teeth; b. type of set teeth; c. the sawing process (view from the side of the workpiece face)

Saws for transverse sawing (sawing across the grain of wood) have straight teeth (Fig. 24, a), for longitudinal sawing (along the grain). inclined (Fig. 25, a).

Fig. 25. Saw teeth for longitudinal sawing: a. the shape of the teeth; b. type of set teeth; c. the sawing process (view from the side of the workpiece face)

When sawing a workpiece, the saw blade rubs against the kerf. To prevent the blade from jamming (not getting stuck) in the cut, the teeth should be set apart, that is, bent alternately in different directions (Fig. 24, b, 25, b). In this case, the kerf becomes wider, and the saw blade does not get stuck in it when cutting. The width of the set of teeth (T) is usually equal to: T = (1.5. 2) x t, where t is the thickness of the saw blade.

Thin workpieces made of wood and plywood must be cut with fine-toothed saws at a slight angle to the plane of the workpiece (Fig. 26, a). When cutting thick lumber, the saw is held at an angle of 30.45 ° (Fig. 26, b).

Fig. 26. The angle of inclination of the saw when sawing: a. plywood; 6. thick lumber

To do the job well, it is necessary during sawing to constantly monitor the marking line marked on the workpiece: it should remain on the left close to the cut (see Fig. 26). In this case, the saw blade must move at right angles to the plane of the workpiece.

To cut small-sized workpieces, they are fastened to the clamps of the joiner’s workbench.

When sawing on the workbench lid (Fig. 27), workpiece 1 is placed on a backing board 3, a small block 2 is placed on top and pressed against the workpiece with the left hand, aligning the end of the block with the marking line. Then, resting the saw blade on the end of the bar, make a few short movements with the saw towards you. This is how they get a gash. a small cut in the workpiece near the mowing line of the marking, which allows you to cut further strictly according to the marking.

Fig. 27. Sawing on a backing board: 1. blank; bar; 3. backing board

Often in training workshops, a simple device is used in the form of a piece of a board with two stops (Fig. 28). It is installed on the lid of the workbench, pressing the lower stop against the lid. The workpiece is laid on this device and pressed tightly against the upper stop so that its end coincides with the marking line. After that, make a gash and perform a sawing. At the end of the cut, release the pressure on the saw so that the last cut wood fibers do not splinter.

Fig. 28. Sawing with the help of the device (a): 1. upper stop; 2. base; 3. blank; 4. bottom stop; 5. hacksaw; 6. workbench; sketches of parts of the device (b)

Sometimes it is necessary to cut several workpieces at an angle of 45 or 60 °. For this purpose, use a miter box (Fig. 29). a wooden or metal box with cuts in the side walls located at different angles.

Fig. 29. Sawing in a miter box: 1. miter box; 2. clamping screw; 3. blank; 4. cuts

Currently, during construction work, electric jigsaws are usually used to saw wood blanks up to 60 mm thick (Fig. 30).

Fig. 30. Electric jigsaw: 1. file; 2. case; 3. power button; 4. switch blocking button; 5. handle; 6. electric cord; 7. support

At woodworking enterprises, wood is cut on circular saws (Fig. 31).

Fig. 31. Scheme of processing a workpiece from wood on a circular saw: 1. workpiece; 2. circular saw; 3. machine table; 4. stop

Safe work rules

  • Before sawing, the workpiece must be properly and securely fastened to the workbench. Sawing attachments should be used.
  • When sawing, do not keep your left hand close to the saw blade.
  • When sawing, do not make sudden movements with the saw and do not allow bending of its blade.
  • At the end of the work, remove chips from the workbench cover only with a special brush.
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Getting to know the professions

The sawmill operator is a specialist who works in a woodworking enterprise and is engaged in sawing various types of lumber. He configures and controls woodworking machines when processing sawn timber. He must know the properties of wood, be able to economically saw the material, ensure the receipt of high-quality blanks.

Practical work number 6

Sawing wood blanks

  • Consider the saws available in the training workshop. Determine what kind of sawing they are intended for; which saws have fine teeth and which have large.
  • Sawed preliminary marked workpieces (as instructed by the teacher): parts “base” (see Fig. 9), “pencil holder” (see Fig. 41) and a house for birds (see Fig. 10); blank for the fish cutting board (see fig. 21); parts of the sawing device (see Fig. 28), a table shelf (see Fig. 57), a shelf for flowers (see Appendix, Fig. 172) or details of your project product.
  • Check the dimensions of the cut blanks.

New words and concepts

Hacksaw, sawing (transverse, longitudinal), tooth setting, miter box, sawing machine operator.

Circular Saw Jet

Jet circular saw. professionalism and precision in work execution

Jet circulars are presented by the Swiss concern JET in a large assortment. This is not surprising, given that the brand specializes in the production of high-precision machine tools and occupies a leading position in the world market.
“Swiss quality” and “Swiss precision” are precisely the phrases that can be used to describe the brand’s products. The company pays special attention to the development and improvement of the smallest units and mechanisms, on which the increase in the reliability and safety of work performance depends.
Jet circular saws. these are simple tools, the main unit is a toothed disc located on a sturdy bed. The machines can be used for sawing wood, plastic, fiberboard and PVC, as well as many other materials. The main working characteristic of the machines is the number of teeth on the saw blade. A small number indicates that the saw blade is intended for cross-cutting, a large number of teeth are used for ripping.

BUY JET CIRCULAR MACHINES FOR WOOD IN JET UKRAINE OFFICIAL STORE

Circular saws for soft wood

Small, compact floor-standing or bench-top machines are capable of processing small wood species with high precision. The important features are:

  • quick stop of engine rotation after shutdown;
  • the saw blade has the ability to adjust the angle of inclination;
  • the cutting depth is set by the operator;
  • the work table is made of aluminum alloy, which is highly resistant to physical impact and has a long service life;
  • the corner stop has high mobility and moves along the T-shaped groove with the help of a guide;
  • it is possible to change the design due to expanders and an extension, which significantly increase the saw’s capabilities when processing long workpieces.

Professional circular saws with a stable design

Powerful plant designed for industrial use.
Heavy construction allows you to handle solid hardwoods such as Brazil walnut, hornbeam, green ebony, rosewood, maple, etc.

Distinctive features of the machines:

working shaft locking mechanism. required to replace the disc;
working body made of cast iron is distinguished by its durability and wear resistance;
the riving knife is adjustable;
it is possible to adjust the parallel stop with eccentric clamping.
Rigid construction provides cutting with an accuracy of 0.15 mm in length;
PTFE linings contribute to smooth sliding and cleanliness of the workpiece;
carbide-tipped saw blades.

Circular saws

Manufacturer: JET

Model: JTS-10

Power consumption (output): 1.5 kW

Voltage: 230V

Saw blade speed: 4500 rpm

Saw blade: 254/30 mm

Maximum cutting depth 90 °: 80 mm

Maximum tilt of the saw blade: 45 ° to the left

Maximum cutting width with parallel stop: 410 mm

Table size: 430 x 640 mm

Extension table size: 940 x 640 mm

Weight: 37 kg

Power consumption: 1.5 kW

Saw blade idling speed: 4500 rpm

Saw blade outer (landing) diameter: 254 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at an angle: 0 ° and 45 ° 0 and 55 mm

Worktable dimensions (LxW): 535×610 mm

Expansion of the desktop on the right (LxW): 535×152 mm

Manufacturer: JET

Model: JTS-254

Power consumption (output): 1.8 kW

Saw blade idling speed: 4500 rpm

Saw blade outer (landing) diameter: 254 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 90 and 65 mm

Working table dimensions (LxW): 640×495 mm

Extendable work table extension on the right (W): up to 640 mm

Maximum workpiece width when sawing with the parallel stop on the right: 640 mm

Dimensions of the base of the movable stop (LxW): 640×145 mm

Moving stop travel: 695 mm

Exhaust connection diameter: 65 mm

Overall dimensions (LxWxH): 640x730x470 mm

Weight: 25 kg

Manufacturer: JET

Model: JTS-315SP-230

Consumed (output) power: 2.2 (1.6) kW

Saw blade idling speed: 2800 rpm

Saw blade outer (landing) diameter: 315 (30) mm

Saw blade tilt angle: 0-47 °

Maximum cutting depth at 0 ° and 45 °: 90 and 60 mm

Worktable dimensions (LxW): 800 x 550 mm

Extension of the desktop (LxW): 800 x 550 mm (standard)

Expansion of the working table (LxW): 800 x 550 mm (option)

Maximum workpiece width when sawing with a parallel stop on the right: 310 mm (standard), 860 mm (optional)

Dimensions of the movable table (LxW): 250 x 230 mm

Moving table (carriage) stroke: 650 mm

Maximum cutting length on a movable table: 600 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 1310 x 970 x 1000 mm

Weight: 50KG

Manufacturer: JET

Model: JTS-315SP-400

Consumed (output) power: 3.1 (2.0) kW

Saw blade idling speed: 2800 rpm

Saw blade outer (landing) diameter: 315 (30) mm

Saw blade tilt angle: 0-47 °

Maximum cutting depth at 0 ° and 45 °: 90 and 60 mm

Worktable dimensions (LxW): 800 x 550 mm

Extension of the desktop (LxW): 800 x 550 mm (standard)

Expansion of the working table (LxW): 800 x 550 mm (option)

Maximum workpiece width when sawing with a parallel stop on the right: 310 mm (standard), 860 mm (optional)

Dimensions of the movable table (LxW): 250 x 230 mm

Moving table (carriage) stroke: 650 mm

Maximum cutting length on a movable table: 600 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 1310 x 970 x 1000 mm

Weight: 50KG

Manufacturer: JET

Model: JTS-250CSX-400

Power consumption (output): 2.5 (1.9) kW

Saw blade idling speed: 3850 rpm

Saw blade outer (landing) diameter: 254 (30) mm

Outside (landing) diameter of the Dado disc: 200 (15.88) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 80 and 57 mm

Working table dimensions (LxW): 685×508 mm

Expansion of the desktop on the left (LxW): 685×254 mm

Expansion of the desktop on the right (LxW): 685×254 mm

Maximum workpiece width when sawing with a parallel stop on the left: 305 mm

Maximum workpiece width when sawing with parallel stop on the right: 1250 mm

Dimensions of the movable table (LxW): 1220×230 mm (option)

Moving table travel (carriage): 1400 mm (option)

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 2083x983x1016 mm

Weight: 186 kg

Manufacturer: JET

Model: JTS-600XT

Consumed (output) power: 2.5 (2.0) kW

Saw blade idling speed: 4000 rpm

Saw blade outer (landing) diameter: 254 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 80 and 54 mm

Working table dimensions (LxW): 800×350 mm

Working table extension (LxW): 415×350 mm

Maximum workpiece width when sawing with the parallel stop on the right: 610 mm

Dimensions of the movable table (LxW): 1000×255 mm

Extension of the movable table (LxW): 600 x 460 mm

Maximum width to stop of the end stop of the movable table: 2200 mm

Moving table (carriage) stroke: 660 mm

Maximum cutting length on a movable table: 610 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 1300 x 1700 x 1100 mm

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Weight: 145 kg

Manufacturer: JET

Model: JTS-250CSX-230

Consumed (output) power: 2.0 (1.5) kW

Saw blade idling speed: 3850 rpm

Saw blade outer (landing) diameter: 254 (30) mm

Outside (landing) diameter of the Dado disc: 200 (15.88) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 80 and 57 mm

Working table dimensions (LxW): 685×508 mm

Expansion of the desktop on the left (LxW): 685×254 mm

Expansion of the desktop on the right (LxW): 685×254 mm

Maximum workpiece width when sawing with a parallel stop on the left: 305 mm

Maximum workpiece width when sawing with parallel stop on the right: 1250 mm

Dimensions of the movable table (LxW): 1220×230 mm (option)

Moving table (carriage) stroke: 1400 mm (option)

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 2083x983x1016 mm

Weight: 186 kg

Manufacturer: JET

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Model: PM1000-400

Consumed (output) power: 3.0 (2.2) kW

Saw blade idling speed: 4200 rpm

Saw blade outer (landing) diameter: 250 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 80 and 54 mm

Desktop dimensions (LxW): 685 x 508 mm

Expansion of the desktop on the left (LxW): 685 x 254 mm

Right desktop extension (L x W): 685 x 254 mm

Maximum workpiece width when sawing with a parallel stop on the left: 305 mm

Maximum workpiece width when sawing with the parallel stop on the right: 1320 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 2108 x 1092 x 1117 mm

Weight: 152 kg

Manufacturer: JET

Model: JTS-600XL-230

Consumed (output) power: 2.5 (1.5) kW

Saw blade idling speed: 4000 rpm

Saw blade outer (landing) diameter: 250 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 80 and 54 mm

Work table dimensions (LxW): 800 x 350 mm

Working table extension (LxW): 400 x 350 mm

Extension of the desktop on the right (LxW): 800 x 270 mm

Maximum workpiece width when sawing with the parallel stop on the right: 610 mm

Dimensions of the movable table (LxW): 1600 x 240 mm

Extension of the movable table (LxW): 600 x 460 mm

Maximum width to stop of the end stop of the movable table: 2600 mm

Moving table (carriage) stroke: 1600 mm

Maximum cutting length on a movable table: 1450 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 1600 x 2000 x 1115 mm

Weight: 170 kg

Manufacturer: JET

Model: JTS-600XL-400

Consumed (output) power: 2.5 (1.5) kW

Saw blade idling speed: 4000 rpm

Saw blade outer (landing) diameter: 250 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 80 and 54 mm

Worktable dimensions (LxW): 800 x 350 mm

Working table extension (LxW): 400 x 350 mm

Extension of the desktop on the right (LxW): 800 x 270 mm

Maximum workpiece width when sawing with the parallel stop on the right: 610 mm

Dimensions of the movable table (LxW): 1600 x 240 mm

Extension of the movable table (LxW): 600 x 460 mm

Maximum width to stop of the end stop of the movable table: 2600 mm

Moving table (carriage) stroke: 1600 mm

Maximum cutting length on a movable table: 1450 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 1600 x 2000 x 1115 mm

Weight: 170 kg

Manufacturer: JET

Model: PM1000-230

Consumed (output) power: 2.0 (1.5) kW

Saw blade idling speed: 4200 rpm

Saw blade outer (landing) diameter: 250 (30) mm

Outside (landing) diameter of the Dado disc: 200 (15.88) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 80 and 54 mm

Work table dimensions (LxW): 685 x 508 mm

Extension of the working table on the left (LxW): 685 x 254 mm

Right desktop extension (L x W): 685 x 254 mm

Maximum workpiece width when sawing with a parallel stop on the left: 305 mm

Maximum workpiece width when sawing with the parallel stop on the right: 1320 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 2108 x 1092 x 1117 mm

Weight: 152 kg

Manufacturer: JET

Model: JTS-1360-T

Consumed (output) power: 3.0 (2.5) kW

Saw blade idling speed: 4250 rpm

Saw blade outer (landing) diameter: 315 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 105 and 75 mm

Working table dimensions (LxW): 760×350 mm

Working table extension (LxW): 500×350 mm

Additional extension of the working table made of steel sheet on the right (LxW): 760×600 mm

Maximum workpiece width when sawing with the parallel stop on the right: 940 mm

Dimensions of the movable table (LxW): 1360×240 mm

Extension of the movable table (LxW): 300×243 mm

Moving table (carriage) stroke: 1360 mm

Maximum cutting length on a movable table: 1250 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 1450x1800x880 mm

Weight: 187 kg

Manufacturer: JET

Model: JTS-1600-T

Consumed (output) power: 3.0 (2.5) kW

Saw blade idling speed: 4250 rpm

Saw blade outer (landing) diameter: 315 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 105 and 75 mm

Working table dimensions (LxW): 760×350 mm

Working table extension (LxW): 500×350 mm

Maximum workpiece width when sawing with the parallel stop on the right: 940 mm

Dimensions of the movable table (LxW): 1600×240 mm

Maximum width to stop of the end stop of the movable table: 2200 mm

Moving table (carriage) stroke: 1600 mm

Maximum cutting length on a movable table: 1600 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 1700x2100x880 mm

Weight: 223 kg

Manufacturer: JET

Model: JTAS-10DX

Consumed (output) power: 5.2 (4.0) kW

Saw blade idling speed: 4300 rpm

Saw blade outer (landing) diameter: 250 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depths at 0 ° and 45 °: 76 and 54 mm

Desktop dimensions (LxW): 737 x 508 mm

Extension of the working table on the left (LxW): 737 x 280 mm

Extendable desktop extension on the right (LxW): 737 x 280 mm

Maximum workpiece width when sawing with the parallel stop on the left: 330 mm

Maximum workpiece width when sawing with parallel stop on the right: 1270 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 2100 x 880 x 1040 mm

Weight: 195 kg

Manufacturer: JET

Model: JTAS-12DX

Consumed (output) power: 6.5 (5.0) kW

Saw blade idling speed: 4300 rpm

Saw blade outer (landing) diameter: 305 (30) mm

Saw blade tilt angle: 0-45 °

Maximum cutting depth at 0 ° and 45 °: 102 and 73 mm

Worktable dimensions (LxW): 800 x 610 mm

Expansion of the desktop on the left (LxW): 800 x 254 mm

Extendable desktop extension on the right (LxW): 800 x 254 mm

Maximum workpiece width when sawing with a parallel stop on the left: 355 mm

Maximum workpiece width when sawing with parallel stop on the right: 1270 mm

Exhaust connection diameter: 100 mm

Overall dimensions (LxWxH): 2100 x 940 x 1040 mm

Weight: 206 kg

JET circular saws

Machine tools, unique in execution, which include a movable carriage table. Expanders have an adjustable telescopic support and an end stop for wood workpieces. Vibration when working on the machine is reduced due to additional spacers.

Key Features:

  • The rotary end stop allows you to set the exact cutting angle thanks to the markings;
  • One or two end stops securely fix the workpiece;
  • The movable table is made of aluminum profile, which increases the working life of the machine;
  • Expanders are made of a strong profile with a large cross section, from which it is possible to install heavy workpieces.

Finding the Right Band Saw Blade Lubricant.

Never use water as a band saw lubricant. Water is not a lubricant and should not be used for many reasons. Not only is water unacceptable as a lubricant, it also causes the blade to rust, causing corrosion, and inappropriate swarf swelling. This prematurely destroys the band body and the grooves between the saw teeth. Water is also wet tires or V-belts.
The blade should not be lubricated unless resin adheres to the saw blade. If sticking does occur, we can offer you the following:
For proper lubrication, mix highly adhesive chainsaw oil with kerosene or diesel fuel in half. Spray the resulting mixture on both sides of the blade every four minutes while the machine is running. After lubrication, the sawing noise is reduced by more than 50%. Do not apply grease until the noise starts to increase. You must lubricate both sides of the saw.
Blade lubrication increases belt life by more than 30%. By sparingly applying lubricant, you will be able to cut high-grade timber without getting it dirty; we also believe that this extends the life of the rubber seals.

Six basic rules for sawing

Sharpening procedure

There is only one way to sharpen band saws. The stone should travel down the surface of the tooth around the base of the cavity and up along the back of the tooth in one continuous motion. You do not need to touch the cavity itself.

The space between the tines (galllet) is not a dust bin for sawdust. In fact, this is the second hardest part of the saw. A good gallet is like an upside-down wing of an airplane. The power flow of air, cooling of steel and removal of sawdust depends on it. If you have the correct set of teeth, air is blown along the log at the same speed as the saw, as a result the sawdust is sucked into the galllet. The sawdust cools it significantly by passing around the inside and outside of the next prong. You need to make sure that the space between the teeth is 40% full, which will provide the right amount of cooling and increase the saw’s operating time.

If you only sharpen the front and back sides of a tooth, you compromise the integrity of the cavity, which will cause the saw to break.

So, you have checked your indicator and set accuracy, which are actually set 0.02-0.03 more than what you require. You have double checked the feed angle of the sharpener and it is exactly what you want. You can now start sharpening the saw.

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Choosing the correct set of teeth.

The divorce is correct if in the space between the saw blade and the processed wood you have a mixture of 65-70% sawdust and 30-35% air. A sign that you have chosen the correct mix is ​​the removal of 80-85% of sawdust from the cut. If your tooth setting is too large for the available wood thickness, you will have too much air and not enough sawdust in the cut. You will have excessive sawdust losses and may be accompanied by tooth marks on the surface of the board. If you do not have enough divorce, you will not get a strong enough air flow to remove sawdust from the cut. Hot sawdust is a sign of this. This can do the most damaging damage to a band saw: working intervals will be short and the saw will fail prematurely. The sawdust should be cold to the touch, not warm or hot. And finally, if there is insufficient spreading and an incorrect sharpening angle, the saw will cut a wave on the board.
Typical example: If you are sawing a 35 cm log, the sawdust is warm to the touch, the feed rate is normal, long working intervals are maintained, and at least 85% of the wood dust is sucked out. the saw teeth are set correctly. Then you take on a 60 cm log. It would be logical for the widow to increase the set of teeth while increasing the mass of the tree by 100%. In fact, in this case you should increase the tooth set by approximately 20%. From our point of view, you cannot work with the same set of tines with logs of different diameters, timber and cant. You must sort the timber.
For every 20-25 cm increase in size, you should increase the set by about 18% depending on whether the wood is hard or soft, wet or dry. The only way to achieve the desired layout is to make control cuts on a specific log. Increase the set by 0.05-0.10 mm on each side until the tooth marks are visible. This means that you are working with a 50/50 mixing of air and sawdust. Then reduce the tooth setting by 0.75 mm on each side and you will achieve the desired result.

VERY IMPORTANT: YOU MUST BREAD ONLY THE UPPER THIRD TOOTH, NOT THE MIDDLE OR BOTTOM. YOU DO NOT NEED THAT THE CUT BETWEEN THE TEETH FILLS FULLY WHEN SAWING.

When you work with softwood, whether wet or dry, the chips increase in volume 4 to 7 times their cellular state. Hardwoods, wet or dry, increase in size by only 0.5-3 times, free of cellular structure. This means that if you are cutting 45 cm pine logs, you will need to set the teeth 20% more than when you are working with the same oak logs. Always set the teeth apart before sharpening. It is necessary that the end of the tooth is located perpendicular to the band of the tape. Set the teeth by 0.02-0.03 mm more than required, and after sharpening, the set will be exactly what you need. It is important to know that there is a real formula for the correct set of teeth.

For sawing logs on band sawmills of the Avangard-LP type, we offer a series of Silco saws with widths of 31, 38, and 51 mm and a tooth pitch of 19, 22, 25 mm, respectively. Blade thickness 1.07 mm. Saw teeth hardened and set by the firm with an accuracy of 0.04 mm.
There are four types of wiring (on both sides):
– for dry hardwood (oak, beech.). 2.03 mm;
– for wet hardwoods 2.18 mm;
– for dry coniferous and soft-leaved species, 2.29 mm;
– for moist conifers and soft-leaved species. 2.53 mm.

Softwood with a lot of knots

Tension the saw bands correctly

Perform a vibration test to check that the saw band tension is correct.

Hakansson Sawblades band saws are low tension saws. run at 35-50% less tension than competitive carbon saws. The low tension of the belts, which provides sufficient stability, reduces the effect of fatigue at constant bending by 70% or more, therefore, significantly extends their service life. Energy consumption is reduced by 20%.

The tension force for Silco saws should be about 100-150 kg / cm2. In particular, saws with a width of 32-51 mm for band sawmills should be tensioned with a force of about 130-150 kg / cm2.

To measure the tension of the saw band, your machine must have some kind of device (dynamometer, pressure gauge, etc.). If you do not have it. use our tensometer.
The tension force used is also largely dependent on the design of your machine or sawmill. To make the most of your band saws, if possible, always try to follow the guidelines below.

A. For machine tools with mechanical tension.

  • Remove the idler rollers. you cannot perform this check if the band saw blade has limited horizontal movement.
  • Make sure the saw wheel surfaces are in good condition. If equipped with belts, the belts must not be hard, twisted, split or broken. On machines with inaccurate V-belts, replace them with a smaller size so that they fit tightly. This will reduce vibrations on your machine or sawmill by more than 80%.
  • Place the blade on the machine and tension with the force recommended by other manufacturers for saws made of other steels.
  • Close covers for safety.
  • Start the machine with the switch in high speed cutting mode.
  • Stand in front of the machine, hand on the tensioning mechanism, eyes on the band saw. Begin to loosen the canvas very slowly without taking your eyes off it. You have to get to the point where the canvas starts to vibrate.
  • When you see the blade begin to vibrate, you have reached the zero position. Now start adding tension by turning the tension screw a quarter turn. Slowly until the saw stops vibrating and starts functioning stably again. At this point, add another full turn of the tension screw.
  • Your canvas is now properly tensioned. Turn off the machine and put your guides back in place. Are you ready to go.
  • Always relieve blade tension between jobs. When you release the tension, remember that to completely relax the saw, it is enough to turn the screw 8-10 full turns. For tension, you just need to turn the screw in the opposite direction by the same number of turns. If you do these procedures as described above, you will only need to perform the vibration test once.

B. For machines with hydraulic tension.

  • Perform the above operations. At the same time, decrease and increase the pressure in steps of 10-12 kg. After you have eliminated vibration, add another 25 kg. Remember the pressure on the pressure gauge scale.

ALWAYS RELEASE TENSION ON THE SAW BETWEEN OPERATIONS

The next time you use the tape again, use the settings you memorized to avoid repeating the vibration test.

B. For machines with pneumatic tension.

  • Perform the above operations. At the same time, decrease and increase the pressure in 5 kg steps. After you have eliminated vibration, add another 5 kg. Remember the pressure on the pressure gauge scale.

ALWAYS RELEASE TENSION BETWEEN OPERATIONS

The next time you use the tape again, use the settings you memorized to avoid repeating the vibration test.

ATTENTION: IF YOU DO NOT PERFORM THE VIBRATION TEST FOR OUR SILICON STEEL SAWS, YOU WILL OVERTENSION AND YOU WON’T GET THE WEAR RESISTANCE AND DURABILITY FOR WHICH OUR SAWS ARE CAPABLE.

Always release the tension on the saw band.

When you’re done, release tension on the saw. In operation, the saw bands always heat up and lengthen and then cool down to shorten during each cooling period. Therefore, the saws left on the pulleys in a taut condition overload themselves, and an imprint from the two pulleys forms on them, which causes cracks in the cavities between the teeth. When you leave the belt under tension on the machine, you not only deform the rim and surface of the belts (which makes them very rough), but also put excessive stress on the bearings and shafts. Believe it or not, sooner or later you can damage the geometry of the pulleys and significantly reduce their service life. You also destroy your rubber pads and V-belts.

Guidelines for saws use

  • Tension the saw bands correctly.
  • Use Saw Band Lubricant Correctly.
  • Always release the tension on the saw band.
  • Set the teeth correctly.
  • Sharpen your band saws correctly.
  • Use the correct sharpening angle.