Circular saws
Circular hand-held circular saws for wood. With laser line guide, tungsten carbide discs from 150 to 335 mm and variable speed!
Parallel stop.
How to cut exactly parallel to the edge or to get several of the same workpieces? Mere guiding along the mowing line will not give the required accuracy.
You can fix a block next to it and pushing the side of the platform against it, move the tool forward. But fixing with clamps is not always possible, and the use of self-tapping screws or nails will leave behind indentations.
The rip fence has a T-shaped design and consists of a clamping unit mounted on a platform, a ruler and a base plate.
The required distance is set, the sliding ski rests on the edge, the ruler is tightened with a screw and you can saw.
The best circular saw blades have stops with two locking points to avoid backlash and ensure strict parallelism.
Circular saw for wood TexAS TA-01-501
Circular saw for wood BauMaster CS-50200
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.
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:
- 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.
- 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.
- 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.
Tool specifications
The saw is rightfully considered the ancestor of a large family of hand tools. Since the creation of the first type of tool from iron, the saw has undergone many changes, having managed to acquire numerous "sisters" capable of performing dozens of jobs.
In the household, it is impossible to do without "toothy helpers": they are irreplaceable when pruning a garden, small carpentry and joinery
Hand saws for wood differ in many ways: blade size, steel grade, tooth shape, handle design. Let’s dwell on each parameter in more detail.
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 a high silicon and carbon content 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.
But modern hacksaws, unlike classic ones, have hardened teeth with a non-standard trapezoidal shape. These saws are endowed with increased strength and wear resistance. Their steel will not give in to sharpening, and it is very difficult to observe all the angles of the sharpened teeth.
Tooth size
This is perhaps the most important parameter. After all, the speed and accuracy of the cut depends on the size of the tooth.. The number of teeth per inch of blade is commonly referred to as TPI. For more accurate work with the material, it is necessary to use a hacksaw with a high TPI, that is, with a large number of teeth. When choosing a blade with a TPI of at least 7–9, and the distance between the teeth no more than 2–4 mm, the surface at the cut will be smoother and without torn edges. A blade with TPI 3–6, tooth spacing of over 4 mm, will work well for working with large beams and garden trees. The use of such a hacksaw will reduce the effort expended and increase the speed of cutting the working material..