The left and right cutting teeth on the saw chain are cutting cutting tools. After a period of use, the cutting edge is blunt, so that the cutting is smooth and the sharpness of the cutting edge is maintained. Repair notes: 1, choose the round file suitable for repairing the saw chain. The cutting teeth, size and arc of various types of saw chains are different. The standard of the rounds required for each type of chain is certain. Please refer to the manual for details. 2, pay attention to the repair direction and angle, to repair along the direction of the cutting edge, pull back to be light, as far as possible not to force back and forth, the general saw chain edge angle is about 30 degrees, while the front high and then low The angle is about 10 degrees. These angles vary according to the hardness of the material being sawed and the habit of the saw. At the same time, attention should be paid to the symmetry of the left and right incisors. If the deviation is too large, the saw will be deflected and sawed obliquely. 3, pay attention to the limit tooth height. Each part of the cutting tooth protrudes in front of the cutting tooth. This is the limiting tooth. It is 0.6---0.8 mm lower than the upper edge of the cutting edge. The cutting amount per tooth is so thick. When repairing the cutting edge, pay attention to its height. If the edge is repaired more, the limit tooth will become higher relative to the cutting edge, and the amount of cutting will become smaller each time, which will affect the cutting speed. If the cutting edge is lower than the limit tooth, it will not eat wood. , can not be cut, the limit tooth repair is too low, each tooth is too thick each time, it is likely to cause "scissor" and can not be sawed.

maintenance of the chain

The saw chain runs fast. Take the 3/8 saw chain as an example. The number of teeth of the sprocket is 7 teeth. When the engine rotates at 7000 rpm, the saw chain runs at 15.56 meters per second. The driving force of the sprocket and the reaction force during cutting are concentrated on the rivet shaft. The working condition is bad and the wear is serious. If the maintenance is not paid attention, the saw chain will be scrapped quickly.

Maintenance is carried out from the following aspects:

1 Always pay attention to the lubrication;

2 Maintain the sharpness of the cutting edge and the symmetry of the left and right incisors;

3 Always adjust the tension of the chain, not too tight or too loose. When the saw chain is adjusted, when the hand-saw chain is lifted up, a middle guide tooth is completely exposed to the guide groove;

4 Clean the cleaning guide groove and the saw chain in time, because the guide plate and the saw chain will wear when sawing, the worn iron and fine sand will accelerate the wear and tear, and the glue on the tree, especially the oil on the pine tree. During the sawing process, the heat melts and adheres to the saw chain, so that the joints are sealed, hard, oil can not enter, can not be lubricated, and will accelerate wear. It is recommended to remove the saw chain after daily use and soak it in kerosene for cleaning.