How to saw plywood evenly with a jigsaw. Technology of even cut

Is it possible to saw boards with an electric jigsaw?

pitch (t) is the distance between the tops of the teeth. In some countries, the pitch is referred to as TPI (teeth per inch). measured in number of teeth per inch (e.g. TPI = 7, t.е. 7 teeth per inch). When cross-cutting wood it is convenient to use the saw with large tooth t = 3,5-6,5 mm (TPI = 7-3,5), for regular carpentry work. with medium tooth t = 3-3,5 mm (TPI = 9-7), for demanding sawing. with small tooth t = 2-3 mm (TPI = 13-9). The thickness of the material to be sawed must also be taken into account.

It is easier to saw with a jigsaw when 5-8 teeth are engaged. If this rule is not respected, the blade will vibrate when working, and the saw trimmer line will be crooked and torn.

Stability of the saw blade when cutting in a straight line depends on the thickness of the blade. For cutting thick materials, it is best to use circular saws.

Preparing for work and accessories

Electric jigsaws are universal tools. In professional hands, it can replace several devices at once. Before using it, the master always first checks that there is no damage to the power cable.

Then the professional makes a clear marking on the part to be cut. The laser guide is often used, but not every electric tool is equipped with it. If it is missing, the specialist during the sawing is guided by the marks that are on the sole of the jigsaw.

For your reference! Professionals usually cut building material on a saw table. They buy it at specialty stores.

Before straight sawing with an electric jigsaw, most craftsmen buy various additional devices, including:

  • guide bar. makes it easier to make a straight cut;
  • Circular with a parallel stop. used for circular sawing;
  • Metal or plastic removable cover on the sole. improves sliding of the tool on the building material to be sawn;
  • parallel stop. used in straight line cutting;
  • Anti-slip insert. helps to reduce the risk of splintering in the work material and is especially often used for laminate surfaces.

Besides additional devices, for qualitative sawing the master also chooses a suitable cutting blade taking into account the structure of the material to be sawed and the operating mode of the power tool. The specialist performs such actions automatically.

How to cut plywood properly

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If you’re going to do any construction or carpentry work, at some point you may need to cut something out of plywood. That said, plywood sheets are usually quite large and quite difficult to saw, especially in the absence of special tools. But if you remember some basic rules you can easily cut plywood with a simple hand saw or a circular saw, also called a circular saw. The most important thing is that your saw blade is sharp and the plywood sheet itself remains stable.

  • You can even find special saw blades in the store “for plywood”, Nevertheless, check the number of teeth on them. [2] X
  • Circular saw blades come in a variety of sizes, so make sure the saw blade you choose will fit your saw. [3] X Source of information
  • If you choose to saw plywood “native” with the blade of your circular saw, it is likely that the sawn edge of the plywood will be jagged and jagged. [4] X Source of information
  • It is necessary to make the saw protrude 5 mm deeper than the underside of the plywood at the moment of sawing. If you are sawing a 2 cm thick sheet of plywood, the depth of cut on the saw should be 2.5 cm. [6] X
  • Lay some 5 x 10 cm wood beneath the sheet of plywood to support it when sawing. Use 5×10 cm wood for this purpose only, because the circular saw will cut into the top edge of the wood when you saw the plywood. [8] X
  • If there are no wooden planks at hand, you can use a piece of styrofoam insulation instead. Lay it on the floor and place a sheet of plywood on top. Make sure that the plywood does not slip on the surface of the foam sheet. [9] X Source of information
  • If you choose to use foam insulation, you can safely move around on the surface of the plywood sheet as you cut, and you don’t have to worry about the plywood sheet breaking off at the end point of the cut. [10] X Source of information
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Saw the plywood face down. To cut plywood with a hand-held circular saw, it must be laid face down. Then the saw teeth will enter the base of the plywood from the front side and exit from the back side. When the saw teeth come out of the thickness of the plywood, they may slightly tear the edge of the cut. That’s why laying plywood face down ensures a neat cut line on the front side of the sheet. [11] X Source of information

A brief introduction to the tool

The jigsaw is a miniature saw that makes human labor easier. The tool handles wood and its derivatives, metal and plastic materials. The principle of operation is to transmit to the cutting tool an oscillating movement in the vertical plane. Moving up and down in parallel with the forward movement, the jigsaw makes a cut in the semi-finished workpiece.

In addition to the vertical reciprocating motion, some models of power tools are equipped with a pendulum stroke. Special feature. the saw moves vertically and simultaneously back and forth. That means that in the working position the teeth are in contact with the material. In the countercurrent the saw blade moves backwards, interrupting the interaction.

Design features

To use the jigsaw properly is to know its construction and technical possibilities.

  • Stand. Used as a base to which other tool elements are attached. Platform must be flat, stiff and strong. correct saw’s direction and thus the ability to make accurate cut depends on it. In addition, the solidity of the base leveled vibrations occurring during the work.
  • Body. Combines main units. motor, gearbox, saw blade mounting system, control elements. Manufactured in two types. with bow-shaped (crampons) handle or “mushroom” (“iron”) handle. Ergonomics. the comfort of the tool’s hand grip, indirectly affects the performance of operations with minimum deviation tolerance.
  • Saw blade mounting mechanism. Locks securely, with no free movement (play), keeping the direction in one plane. a technical option for precise sawing.
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Useful tool

A number of jigsaws are available for the jigsaw to help keep the seam straight:

  • Scraper support. Required for precise circular cuts.
  • Parallel side stop. Designed for straight cuts. The straightness of the seam depends on the condition of the side (backing).
  • Guide rail. Enables precise straight cuts of 20 cm or more.
  • Platform lining. Reduces coefficient of friction, increases sliding on workpiece surface.
  • Anti-skid pad. Reduces chipping. Useful for machining laminated materials.

Characteristics affecting cutting accuracy

The jigsaw has certain characteristics that indirectly or directly affect the nature of the cut. For clarity the values are summarized in the table.

Characteristic Note
Power Affects performance, speed, and depth of cut. That means, with a more powerful saw unit, it is easier to cut a billet without external forces than with a weaker one. Reduces the likelihood of vibration, saw bending, yawing to the side
RPM (number of revolutions) Critical for selecting a sawing mode for a specific material. Impact on cutting speed. High for soft wood, low for steel
Soft start The function allows you to start the cutting operation smoothly, without jerking or impact. The initial sawing operation determines the moment the seam is formed. whether it is an exact hit on the trajectory or at an angle.
Weight Higher tool weight reduces the effects of vibration, slipping to the side
Sawing stroke Directly related to power. Weak units when processing thick parts work in peak mode, at the limit of their capabilities. Increased vibration, saw blade bending, off-trajectory
Pendulum motion Faster cutting, but inferior cutting quality
Speed adjustment Enables optimal cutting behavior in accordance with the material properties of the workpiece
Maintains RPM under load Stability of cutting tool movement in the process of material processing, enables to create smooth, splinter-free and off-track sawing joint
Blow direction Blowing air from motor-cooled blower blows air out of cutting zone to remove sawdust. Better visibility of cutting point
Highlighting of cutting zone Work area illumination increases visual control over cutting direction

Important point. no matter what characteristics of the tool, poor quality of assembling can reduce the performance of the machine to zero.

Cutting tool

The second most important element of an electric jigsaw, affecting the accuracy of the cut.

plywood, evenly, jigsaw, technology
  • Blade length. Determines, in addition to power, the thickness of the workpiece. Mismatch in size leads to peak performance, vibration. Very likely a seam breakage. increase in width, formation of jagged edges.
  • Width of the cloth. Increasing the size helps keep the cutting direction. Narrow files are useful for curved lines.
  • Blade thickness. Increases the rigidity of the cutting attachment. reduces the chance of sideways drift. Keeps blade perpendicular to workpiece surface. Quality of cut increases.
  • Teeth pitch. Determines the type of material to be cut. 3~6 mm is for rough treatment of wood. 2~3 mm. clean cut of laminate, furniture boards, hardwood. Up to 1 mm. metal work. For the consumer’s convenience there are marks on the side of the blade. “wood”, “metal”. “wood”, “metal”. “metal”. “wood”.п.
  • Tooth separation. Allows to make the seam size, which does not impede the movement of the blade. No possibility of jamming or warping.
  • Saw material. Affects strength, rigidity and sharpness. Distortion of any parameter affects the quality of the seam.

Why the jigsaw is crooked

In some cases the craftsman may get a crooked cut. This kind of trouble occurs due to:

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Working with too thick materials is difficult to achieve a smooth cut.

Ways to eliminate the problems

To obtain an acceptable result, it is worth having patience and working properly with the tool. Do not push it too hard or push it forward. It will only worsen the quality of sawing and cause chipping on the material. It is important to apply marking lines on the workpiece for the trimmer.

plywood, evenly, jigsaw, technology

Sawing metal boards, wooden tabletops and other materials should be done with a device with a well-sharpened file.

Saws for working with metals and other materials

Distinctive design feature of this cutting tool in comparison with the saws for wood is the reduced distance between the teeth (1-2 mm) and finer size of the teeth themselves.

plywood, evenly, jigsaw, technology

Blades made of bimetal are used for working hard and tough materials. Loaded working part is made of hardened steel. The main, back part is made of strong and resilient high-carbon steel.

The depth of cut on metal rarely exceeds 2-3 millimeters. One has to be very attentive while cutting metal of such thickness because stiffness is insignificant, there is a risk of warping of the product. To avoid this, the workpiece must be firmly secured. For such purposes it is better to buy or to make a workbench by yourself.

The stiffness of the saw blade is affected by the thickness of the blade. But it is not reasonable to chase after thick saws to cut materials with large cross section. It is better to use a circular saw. The purpose of the cutting tool is usually indicated on the packaging.

Against the background of recent events

That’s a good man. And to those women who cut bags on camera I suggest to cut dollars and euros for a complete diagnosis.

The anti-skid liner

This is a special pad for a specific brand of jigsaw. It is simply inserted between the jigsaw legs and is not fixed in any way. The liner adjoins the file, so it does not let the top layer lint rise (which is why chips occur), so the saw is even. Masters recommend to use saws of the same producer as the jigsaw so the quality of cut is better with the use of the liner.

The liners are sold in sets of 3-5 pcs. They do not last forever. you have to replace them.

It costs about 400 for a Bosch jigsaw.

If you can not find the insert on your jigsaw or do not want to buy it, there is a little tiphak from the masters. glue an ordinary scotch tape in the place where you saw. The scotch needs to be firmly pressed down with your fingernail. Then saw directly over the scotch tape. After that you remove it. The result will be similar to the liner.

It is also possible to make such a soleplate yourself. Here is an example of how our customer made a jigsaw liner from a thin sheet of tin plate.

But it is more convenient to make such a platform from a sheet of Plexiglas. And glue it to the bottom of the jigsaw with double-sided tape.

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