The band saw is an integral part of any band saw. With constant heavy load, the tool should definitely be sharpened. This can be done in specialized centers, spending a significant percentage of time and money. But sharpen band saw can be independently, guided by a number of simple rules.
Circuit band saw.
Band Saw Types
Visually, band saws are almost the same. The only difference that only a master can notice is the type of teeth that is selected according to the type of material being cut. The variety of saws on the tree can be divided into main categories:
- carpentry type;
Based on the work carried out, an appropriate tool with a suitable type of teeth is selected.
Band saws can be with a varied tooth geometry: it is influenced by the type and properties of the raw material being cut. The basic rule of operation: the harder and denser the material that is cut by a band saw, the smaller the front angle of the teeth of the product, as well as their pitch, should be.
Figure 1. Diagram of the teeth of a transverse and longitudinal saw.
So you can improve the quality of the product and extend its life.
For cutting thin-walled surfaces you can use a saw with a standard or small tooth pitch adapted to work with these materials. In the event that a saw with a large tooth pitch is used for these purposes, the risk of its failure will increase significantly. Such a tool would be more appropriate to use for thick-walled surfaces of metal or wood, securely fastened before starting work.Back to table of contents
How to sharpen a saw?
In order to properly sharpen a band saw, it is not necessary to seek help from a professional. Suffice it to arm yourself with the basic rules for the implementation of this procedure, prepare the necessary tools and recall the basics of safety:
- Sharpening band saws by using a special circle, selected on the basis of the hardness of the teeth of the tool. Depending on the technical features of the saw, the shape of the grinding wheel is selected (flat, shaped, in the form of a plate or a cup).
- Before starting sharpening the grinding wheel should be checked for the ability to evenly remove metal over the entire surface of the teeth.
- Sharpening should be carried out without jerks and sudden movements in order to maintain the original appearance and height of the teeth.
- In the mechanism of the grinding wheel there must necessarily be a coolant that can eliminate the possibility of overheating of the mechanism, as well as provide a more accurate sharpening of band saws.
- After the surface treatment of the saw is complete, it is necessary to check whether there are any clinging elements on it. If such moments are found, they can be removed using a grinding machine or the same grinding wheel, if you bring a band saw to it at a certain angle.
Work carried out should be carried out exclusively in a respirator or mask!Back to table of contents
Types of sharpening saws
Scheme sharpening band saw.
Sharpening of a band saw is often carried out in two main areas: full profile - with the help of professional machines - and sharpening the edges of the teeth themselves.
The first method is considered to be the most accurate, because all actions are performed by an automated mechanism. In order to perfectly sharpen the saw, you only need to choose the right elborovy circle, which is the basis of the grinding machine, he will do the rest on his own. The only drawback of this procedure is its high cost, because at its disposal it is necessary to have not only the machine itself, but also a set of elborovy circles, suitable for all versions of band saws.
The second method, focused only on the teeth of the saw, involves both manual processing and sharpening on a professional tool. The first option involves only the presence of an engraver and the skill of the one who honors. His movements must be fast and precise to avoid damage to the metal. Performing such manipulations for the first time, it is recommended to hone your skills on a simple sheet of metal. Otherwise, you can simply spoil the tool. The best option is to walk along the rear and front edges of the band saws on wood, but most of the craftsmen neglect this condition. For the correct functioning of the tool, it is enough to sharpen only the back edges, and this will be much easier and more convenient to implement. Sharpen the front face can be easily in the case when it comes to working on the machine. Here, as in the case of full-profile sharpening, just enough to choose the right shape and size of the grinding wheel.Back to table of contents
Band saw setting
The scheme of the sharpened tooth of a band saw.
Ordinary sharpening is sometimes not enough to get a good band saw. Not the last role in this matter is played by the degree of bending of the teeth of the product - wiring. The essence of the procedure is to reduce the friction force and ensure free movement of the sawn surface between the teeth.
The most common wiring - standard - assumes that all links of the saw alternately bend in different directions by no more than 0.4 mm. You can perform it at home, making sure that the angle of deflection of the teeth was about the same.
The second type of wiring - protecting, is almost never implemented independently at home, since the essence of the procedure is to bend two teeth at different angles, leaving the third untouched. A wavy layout is considered to be similar in complexity, fully justifying its name. The links gently bend in one direction, forming between themselves a kind of wave, tightly adjoining each other.
Carrying out the wiring on its own, the master must take into account the fact that different types of saws require a radically different approach to themselves. Instructions are usually followed by instructions given by the manufacturer, indicating the density of the metal and the recommended angle of deflection. Often it is limited to the range of 30-60%, but for some products, other values are possible.
You can perform such wiring using a special wrench, which has the form shown in fig. one.
You can work in it according to the above scheme, first setting the required mode on the indicator and spreading the teeth in different directions using a manual lever.
The return to the initial state of the device allows you to automatically move to the next pair of teeth in accordance with the set mode. Thus, with a little effort, even the simplest and most inexpensive saw can be turned into a necessary tool at the moment.