Sharpen a Chainsaw

Start to grind the cutter in a direction going away from the bar, using three to five strokes, but always use the same number of strokes on all the cutters.  Use the guide to make sure you keep your file at the correct angle, and go one cutter at a time until you've sharpened all the cutters on one side of the chain.  When you've finished, rotate the chainsaw in the vice and repeat the process with the other side of the chain.