Learning to sharpen a chainsaw chain

The saw chain must be kept sharp in order to cut efficiently, safely and with accuracy. It is recommended that you learn how to sharpen the chain yourself. This is how it’s done.

Professional loggers sharpen their chains several times every working day, because they know that a sharp chain is just as important as a powerful engine.

How often should you sharpen the chain? This depends on how much you use the saw, but when the chain starts to seem blunt it is usually time to sharpen it. The appearance of the chips gives a good indication of the chain’s condition. A sharp chain produces fine, regular wood chips, while a blunt chain just produces sawdust.


You will need a round file, a flat file, and a combination file gauge that fits your chain. Your Jonsered dealer has everything you need. A vice makes the task easier. Secure the bar so you have both hands free.

A little saw chain theory

Each link in the saw chain works rather like a miniature plane. The effectiveness of the chain is determined by the difference in height between the cutter (1) and the raker (2). This height difference controls how deep the cutter bites into the wood. The raker should be about 0.50.8 mm lower than the cutter.


You sharpen the cutters first. Lay the file gauge on the chain. The arrows on the gauge should point in the chain’s direction of rotation. File the tooth using light, regular pushing strokes, at an angle of about 30 degrees to the bar.

File each tooth the same number of strokes. File every second tooth from the right, and those in between from the left. A tip: If you have secured the bar in a vice it is easier to file every second tooth from one side, then turn the saw around and file the rest from the other side.


Lay the raker gauge on the chain and use the flat file to file each raker flush with the gauge. The gauge has two positions: H for hard species of wood or frozen timber, and S for soft species of wood.

Warning: If you file the rakers without a gauge you might file them down too far. This will result in the chain biting too deeply, which increases the risk of kickback, excessive vibration and poor accuracy.

Maintenance, US, 2min 59sec