A chainsaw blade can be sharpened in many ways. Rotary grindstones with different diameters (3/16, 5/32 and 7/32) are available for this purpose. Otherwise, you can use a chain saw file or mechanically sharpen the blade using a machine.
First of all, the chainsaw should be cleaned meticulously to remove debris, dirt or oil. You can use spirits or detergents to clean the chain saw. Otherwise, you can purchase commercial cleaning solutions to ensure that the parts do not get damaged. Inspect the chain saw to see whether there are any worn out, bent, chipped or broken teeth. In this case, it is better to replace it than sharpen it. If the top plate, which is the flat surface at the top of the chainsaw teeth, is less than ¼ inch, then you need to discard it. Weakened saws are dangerous to operate as it may suddenly break in the middle of using it.
In order to mechanically sharpen a chain saw, fit it to the machine placing it at an angle of twenty-five degrees. You need to protect your eyes and use hand gloves as precautionary measures. Place the chain on the sharpener and loop it to perfectly fit the track. Rotating like this would ensure that every single tooth is sharpened. Now, once you start the machine, the edge that is being sharpened should be lower than the chain. Also, you need to position of the blade to ensure that the lower side of the chainsaw teeth is also sharpened.
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