The method of selection and the correctness of working with band saw types for wood Before thinking about which canvas to choose, you need to pay attention to this: in the end, fatigue elements appear on all canvases and all canvases break anyway.
The web should break if it is installed on a machine and the machine is forced to idle for a very long time.
To define this position, there is the concept of "refining steel to fracture depending on fatigue at maximum bending".
A trained sawyer will choose a blade that combines the best ratio of "refinement of steel to destruction depending on fatigue at maximum bending" - "the value of tooth resistance".
There are two essentially opposite options: one canvas remains sharp for a long time, but it has increased bending fatigue, so it breaks very quickly, the other blunts too quickly and stops cutting, but it does not break.
Each of the listed types of canvas has advantages, and none of the canvases can be considered universal for all purposes of use.
When choosing the type of web, it is also necessary to provide for the type of machine and feedback on the durability of the web.
Cloth with high hardness (first degree of hardening) (CH): a cloth of this type has a fairly high coefficient of operating time from the value of bending fatigue, but at the same time it becomes dull very quickly with respect to all this.
As a result, it is recommended to use this type of cloth in conditions of low and medium load, for example, on a stationary sawmill.
The performance of the belt web on a stationary sawmill does not depend much on the maximum number of revolutions around the pulley, as this affects machines with multi-section heads.
As a result, when used on machines of this type, the hardness of the tooth is put on the back burner in comparison with the degree of working time from bending fatigue.
This is significantly unprofitable in economic terms, since it is necessary to replace this canvas with a sharper one.
An alternative for such a blade with a given degree of hardening when working on stationary sawmills is to use a blade equipped with hardened teeth and uncoated backs (FB).
The cloth of this type has good tooth hardness, because this part of the cloth falls under heat treatment.
The slightly soft base compensates for a fairly high carbon content and at the same time has the best coefficient of operating time from bending fatigue.
Flex Back: such a cloth has a very high hardness and durability of the tooth.
The slightly soft base of the web allows this web to be successfully used on machines with slightly small pulleys.
Such a cloth is economically advantageous to use on machines equipped with multi-section heads.
This canvas may overflow.
Despite this, after it is the part of the tooth that has been heat-treated that will be sanded on this cloth during the repainting, then it is necessary to change the cloth.
Hard Back: such a cloth, like the Flex Back, has a fairly good tooth resistance.
As a result of hardening of this web, it is its increased rigidity that will ensure direct sawing at fairly high feeds.
This canvas can be redrawn more than once.
Despite the fact that the part of the tooth to which heat treatment was applied will be sanded, due to the fact that its base is hardened, therefore, high quality of wood sawing will be ensured.
It is not recommended to use this type of cloth on machines with a pulley size of no more than 30 inches, because this can lead to rupture.
Quite a few unique canvases have been developed to carry out all specific operations.
The unique canvases are equipped with stellite and carbide solders, and these solders are made of high-speed and high-quality steel.
The need to use these unique, and even more expensive canvases, should be chosen by the consumer.
However, if you want to use simpler types of canvases, which are expensive from an economic point of view, or simply will not give you the desired results, then you can choose more expensive canvases to work with.
09 Martha 2017
