Hand-Held Circular Saw For Wood Which To Choose

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The small, narrow saw is a structure that consists of a straight flat blade and a handle. She performs delicate work: through cuts, cut out curved parts.

This type of tool is designed for sawing wood blanks, the thickness of which does not exceed 8-10 cm, sawing small branches and small works in the garden

In the manufacture of narrow models, manufacturers install blades with triangular double-sided teeth, or with parallel sharpening. The disadvantage of the tool is that when pressed during operation, the blade is able to deviate from a given direction.

Parameters of teeth on the blade

The determining indicator of the productivity of the tool and the accuracy of cutting wood is the size of the teeth.

The teeth of a hacksaw for woodworking have a double function: they cut the wood and at the same time remove the sawdust

Cutting accuracy is determined by the TPI, the number of teeth per inch.

There is an inverse relationship between these technical parameters:

  • Blades with large teeth set a high speed of work, but the saw cut is rough and sloppy;
  • Fine-toothed hacksaws guarantee a clean and precise cut, but at a relatively low speed.

When determining the required size of the teeth, one should be guided by the type of material being processed. For example, for work with chipboards, where high cutting accuracy is required, choose a tool with a high TPI 7-9, and for sawing logs and work in the garden, where the cleanliness of the cut is not so important. Tpi 3-6.

When choosing the optimal hacksaw option, be guided by the rule that the minimum log thickness should in any case be greater than the pitch of three teeth

If we compare a hardened and an ordinary tooth, then the difference is that in the first version, subject to domestic use, the product does not dull for a long time. But a hacksaw with a hardened tooth cannot be re-sharpened. When it starts to cut badly, you just have to throw it away.

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A regular tooth lends itself to sharpening. It can be periodically performed using a special file marked with an accident (for sharpening saws). To sharpen the blade, it is enough to perform several movements on each tooth.

Depending on the type of teeth used, there are three types of hacksaws:

  1. For rip sawing. The products are equipped with teeth in the form of an oblique triangle and look like hooks. The tool allows you to cut wood along the grain. Such saws are sharpened on both sides of the tooth, due to which they are able to cut both when going forward and in the opposite direction.
  2. For cross cutting. The tool teeth are made in the form of isosceles triangles. This design makes it easy to cut the material both when the cutting edge is carried forward and backward. But this type of tooth is only suitable for working with dry pieces, not fresh wood.
  3. For mixed sawing. The products have a combined composition, in which triangular edges are combined with slightly elongated semicircular notches. This solution allows, when the hand moves forward, the semicircular teeth make a guiding cut, and when returning, it expands the channel in triangular shape, removing chips and sawdust from it.

Some types of modern tools are equipped with teeth that are trapezoidal. This solution allows you to make the blade more durable and wear-resistant.

But it should be borne in mind that sharpening such a blade is very problematic, since it is difficult for trapezoidal teeth to give the desired shape. This significantly reduces the service life of the product, after which it is necessary to change the blade or purchase a new tool.

For cutting fresh branches, it is more convenient to use blades equipped with triangular teeth, processed with parallel sharpening, in which each element is sharpened only on one side and in a staggered manner

Often on the market you can find a modernized type of hacksaws.

Upgraded hacksaws can be easily distinguished by groups of teeth located on the blade, between which the gaps are clearly visible

Upgraded hand saws are effective for cutting raw wood. Wet chips through the gaps between the teeth in the process of cutting easily come out of the cut without hindering the movement of the tool.

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How should a hacksaw blade be?

The main part of the tool is a hacksaw blade. The first thing you should pay attention to when choosing a product is the length of the canvas. The possibilities of its application largely depend on this parameter. At the same time, the longer the blade, the more spring it is, which also complicates the process, especially when working with hard types of wood, such as ash, maple or oak.

Long stroke enables less effort when sawing, since more teeth are cut in one stroke

For sawing small elements such as plinths, bars or narrow slats, you can do with a hacksaw with a blade length of 25-30 cm.When planning to use the tool for more serious construction work, choose a product with a blade of 45-50 cm.

When determining the length of the hacksaw blade, be guided by the rule that the length of the saw is 2 times the diameter of the processed elements. If you do not follow this recommendation, you will only complicate your work. The teeth of a short hacksaw will jam inside the wood, and each will have to make a lot of effort to advance the tool to free the sawdust. Uncomfortable work will cause premature fatigue.

Traditionally, the width of the fabric of the product varies in the range of 10-20 cm. Models with a narrower fabric are not allowed for technical reasons, since they fail at the slightest bend. But it should be borne in mind that too wide canvases are inconvenient for manual work.

Of no less importance is the material for making the canvas, which is most often the role of alloy steel, as well as its degree of hardening

Tool alloy steel with high m silicon and carbon grades is used for hacksaws:

  • 65g, 60 C2A;
  • 8 HF, 9 HF, 9 XC;
  • U7, U7A, U8, U8A, U8G, U8GA, U9A, U10

Metal hardening is carried out due to the action of an alternating magnetic field on it, in which an electric current of high frequency appears. Spreading over the surface, it heats the surface layer of the metal, which is quenched after cooling.

The standard parameter is considered to be the hardness of the metal at 45 HRC, but it is still preferable to choose products, the hardness of the fabric of which is 55-60 HRC. A hacksaw with a blade of high hardness will have sufficient flexibility, but at the same time high tooth stability. On visual inspection, such a tool can be identified by the darkish shade of sharpened teeth.

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Option # 4. Bow

Bow-type saws are more bulky devices that act as an analogue of a jigsaw.

The main purpose of this type of saw is to create an accurate cut when working with surfaces located at any angle.

Due to the solidity of the design and the threaded connections of the handles, the bow-type saws are able to easily overcome knots, cutting along radii and curved patterns.

Depending on the purpose and design of the saw, there may be:

  • Swinging. For longitudinal cutting;
  • Transverse. For sawing blanks across the wood fiber;
  • Circular. For cutting holes, making rounds and curly sawing;
  • Spike. For cutting connecting spikes, as well as cutting out simple geometric shapes on the workpiece.

Only an onion-type hacksaw can cut the material up and down, sawing blanks with complex fishing lines and performing the work alone without involving an assistant.

Option # 1. Narrow

The small, narrow saw is a structure that consists of a straight flat blade and a handle. She performs delicate work: through cuts, cut out curved parts.

This type of tool is designed for sawing wood blanks, the thickness of which does not exceed 8-10 cm, sawing small branches and small works in the garden

In the manufacture of narrow models, manufacturers install blades with triangular double-sided teeth, or with parallel sharpening. The disadvantage of the tool is that when pressed during operation, the blade is able to deviate from a given direction.

Option # 2. Regular

A standard hand saw can be equipped with any type of teeth and is often equipped with replaceable blades of various types and designs.

To be able to saw off workpieces at a certain angle using a standard hand saw, you have to purchase special miter boxes

But despite the declared versatility of their use, it is not advisable to use saws of this type in the manufacture of furniture.