The crack of saw blade is caused by many reasons ,one is the quality of blade, the other is use of it ,quality of blade :in the manufacturing of blade ,the blade cracks due to the unsuitable heat process or it still not cracked but contains very tense remaining force inside the saw blade .other causes are very high or uneven hardness of blade ,uneven thickness of saw blade
The use of saw blade :the hardness of saw blade is not adequate to carry out the sawing ,e.g. when sawing big diameter and hard or difficult wood ,the very narrow blade is selected (normally Refers to the blade with width of only 2/3 of its original width )or the outspread of saw teeth is different ,or the height of saw teeth is different